gotime/coverage.html at master · maniartech/gotime · GitHub

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<!DOCTYPE html>
<html>
	<head>
		<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
		<title>gotime: Go Coverage Report</title>
		<style>
			body {
				background: black;
				color: rgb(80, 80, 80);
			}
			body, pre, #legend span {
				font-family: Menlo, monospace;
				font-weight: bold;
			}
			#topbar {
				background: black;
				position: fixed;
				top: 0; left: 0; right: 0;
				height: 42px;
				border-bottom: 1px solid rgb(80, 80, 80);
			}
			#content {
				margin-top: 50px;
			}
			#nav, #legend {
				float: left;
				margin-left: 10px;
			}
			#legend {
				margin-top: 12px;
			}
			#nav {
				margin-top: 10px;
			}
			#legend span {
				margin: 0 5px;
			}
			.cov0 { color: rgb(192, 0, 0) }
.cov1 { color: rgb(128, 128, 128) }
.cov2 { color: rgb(116, 140, 131) }
.cov3 { color: rgb(104, 152, 134) }
.cov4 { color: rgb(92, 164, 137) }
.cov5 { color: rgb(80, 176, 140) }
.cov6 { color: rgb(68, 188, 143) }
.cov7 { color: rgb(56, 200, 146) }
.cov8 { color: rgb(44, 212, 149) }
.cov9 { color: rgb(32, 224, 152) }
.cov10 { color: rgb(20, 236, 155) }

		</style>
	</head>
	<body>
		<div id="topbar">
			<div id="nav">
				<select id="files">

				<option value="file0">github.com/maniartech/gotime/age_calculation.go (100.0%)</option>

				<option value="file1">github.com/maniartech/gotime/business_calendar.go (100.0%)</option>

				<option value="file2">github.com/maniartech/gotime/calendar_math.go (100.0%)</option>

				<option value="file3">github.com/maniartech/gotime/convert.go (100.0%)</option>

				<option value="file4">github.com/maniartech/gotime/debug/debug_age.go (0.0%)</option>

				<option value="file5">github.com/maniartech/gotime/examples/tinygo/main.go (0.0%)</option>

				<option value="file6">github.com/maniartech/gotime/format.go (100.0%)</option>

				<option value="file7">github.com/maniartech/gotime/internal/cache/cache.go (94.7%)</option>

				<option value="file8">github.com/maniartech/gotime/internal/nites/convert.go (100.0%)</option>

				<option value="file9">github.com/maniartech/gotime/internal/nites/format.go (100.0%)</option>

				<option value="file10">github.com/maniartech/gotime/internal/nites/parse.go (100.0%)</option>

				<option value="file11">github.com/maniartech/gotime/internal/utils/assert.go (92.9%)</option>

				<option value="file12">github.com/maniartech/gotime/internal/utils/runtime.go (100.0%)</option>

				<option value="file13">github.com/maniartech/gotime/misc.go (100.0%)</option>

				<option value="file14">github.com/maniartech/gotime/parse.go (100.0%)</option>

				<option value="file15">github.com/maniartech/gotime/quarters.go (100.0%)</option>

				<option value="file16">github.com/maniartech/gotime/range.go (100.0%)</option>

				<option value="file17">github.com/maniartech/gotime/relative_functions.go (100.0%)</option>

				<option value="file18">github.com/maniartech/gotime/time_ago.go (100.0%)</option>

				<option value="file19">github.com/maniartech/gotime/time_arithmetic.go (100.0%)</option>

				<option value="file20">github.com/maniartech/gotime/time_calc.go (100.0%)</option>

				<option value="file21">github.com/maniartech/gotime/weekday_count.go (100.0%)</option>

				<option value="file22">github.com/maniartech/gotime/weekday_present.go (100.0%)</option>

				</select>
			</div>
			<div id="legend">
				<span>not tracked</span>

				<span class="cov0">not covered</span>
				<span class="cov8">covered</span>

			</div>
		</div>
		<div id="content">

		<pre class="file" id="file0" style="display: none">package gotime

import (
        "fmt"
        "time"
)

// Age calculates the precise age in years, months, and days between a birth date and a reference date.
// If no reference date is provided, it uses the current time.
//
// The calculation accounts for leap years and varying month lengths.
//
// Example:
//
//        birthDate := time.Date(1990, 5, 15, 0, 0, 0, 0, time.UTC)
//        asOf := time.Date(2025, 7, 7, 0, 0, 0, 0, time.UTC)
//        years, months, days := gotime.Age(birthDate, asOf)
//        // Returns: 35, 1, 23 (35 years, 1 month, 23 days)
func Age(birthDate time.Time, asOf ...time.Time) (years, months, days int) <span class="cov8" title="1">{
        var ref time.Time
        if len(asOf) &gt; 0 </span><span class="cov8" title="1">{
                ref = asOf[0]
        }</span> else<span class="cov8" title="1"> {
                ref = time.Now()
        }</span>

        // Ensure birth date is before reference date
        <span class="cov8" title="1">if birthDate.After(ref) </span><span class="cov8" title="1">{
                return 0, 0, 0
        }</span>

        // Use a more reliable approach: count years first, then months, then days
        <span class="cov8" title="1">birth := time.Date(birthDate.Year(), birthDate.Month(), birthDate.Day(), 0, 0, 0, 0, birthDate.Location())
        reference := time.Date(ref.Year(), ref.Month(), ref.Day(), 0, 0, 0, 0, ref.Location())

        // Start with the birth year and increment until we can't add more years
        currentDate := birth
        for </span><span class="cov8" title="1">{
                nextYear := currentDate.AddDate(1, 0, 0)
                if nextYear.After(reference) </span><span class="cov8" title="1">{
                        break</span>
                }
                <span class="cov8" title="1">years++
                currentDate = nextYear</span>
        }

        // Now add months
        <span class="cov8" title="1">for </span><span class="cov8" title="1">{
                nextMonth := currentDate.AddDate(0, 1, 0)
                if nextMonth.After(reference) </span><span class="cov8" title="1">{
                        break</span>
                }
                <span class="cov8" title="1">months++
                currentDate = nextMonth</span>
        }

        // Finally, count remaining days
        <span class="cov8" title="1">for currentDate.Before(reference) </span><span class="cov8" title="1">{
                days++
                currentDate = currentDate.AddDate(0, 0, 1)
        }</span>

        <span class="cov8" title="1">return years, months, days</span>
}

// YearsBetween calculates the precise number of years between two dates as a float64.
// The result includes fractional years based on the exact time difference.
//
// Example:
//
//        start := time.Date(2020, 1, 1, 0, 0, 0, 0, time.UTC)
//        end := time.Date(2025, 7, 1, 0, 0, 0, 0, time.UTC)
//        years := gotime.YearsBetween(start, end)
//        // Returns: approximately 5.5 years
func YearsBetween(start, end time.Time) float64 <span class="cov8" title="1">{
        // Ensure start is before end
        if start.After(end) </span><span class="cov8" title="1">{
                start, end = end, start
        }</span>

        <span class="cov8" title="1">duration := end.Sub(start)

        // Average number of hours in a year (accounting for leap years)
        // 365.2425 days per year * 24 hours per day
        const hoursPerYear = 365.2425 * 24

        return duration.Hours() / hoursPerYear</span>
}

// MonthsBetween calculates the precise number of months between two dates as a float64.
// The result includes fractional months based on the exact time difference.
//
// Example:
//
//        start := time.Date(2025, 1, 1, 0, 0, 0, 0, time.UTC)
//        end := time.Date(2025, 7, 15, 0, 0, 0, 0, time.UTC)
//        months := gotime.MonthsBetween(start, end)
//        // Returns: approximately 6.5 months
func MonthsBetween(start, end time.Time) float64 <span class="cov8" title="1">{
        // Ensure start is before end
        if start.After(end) </span><span class="cov8" title="1">{
                start, end = end, start
        }</span>

        <span class="cov8" title="1">duration := end.Sub(start)

        // Average number of hours in a month
        // 365.2425 days per year / 12 months * 24 hours per day
        const hoursPerMonth = (365.2425 / 12) * 24

        return duration.Hours() / hoursPerMonth</span>
}

// DaysBetween calculates the number of days between two dates.
// This is a convenience function that returns the integer number of days.
//
// Example:
//
//        start := time.Date(2025, 1, 1, 0, 0, 0, 0, time.UTC)
//        end := time.Date(2025, 1, 8, 0, 0, 0, 0, time.UTC)
//        days := gotime.DaysBetween(start, end)
//        // Returns: 7
func DaysBetween(start, end time.Time) int <span class="cov8" title="1">{
        // Ensure start is before end
        if start.After(end) </span><span class="cov8" title="1">{
                start, end = end, start
        }</span>

        <span class="cov8" title="1">duration := end.Sub(start)
        return int(duration.Hours() / 24)</span>
}

// WeeksBetween calculates the precise number of weeks between two dates as a float64.
// The result includes fractional weeks based on the exact time difference.
//
// Example:
//
//        start := time.Date(2025, 1, 1, 0, 0, 0, 0, time.UTC)
//        end := time.Date(2025, 1, 11, 0, 0, 0, 0, time.UTC)
//        weeks := gotime.WeeksBetween(start, end)
//        // Returns: approximately 1.43 weeks
func WeeksBetween(start, end time.Time) float64 <span class="cov8" title="1">{
        // Ensure start is before end
        if start.After(end) </span><span class="cov8" title="1">{
                start, end = end, start
        }</span>

        <span class="cov8" title="1">duration := end.Sub(start)
        const hoursPerWeek = 7 * 24

        return duration.Hours() / hoursPerWeek</span>
}

// DurationInWords returns a human-readable representation of a duration.
// It formats the duration in the most appropriate unit(s).
//
// Example:
//
//        d := 2*time.Hour + 30*time.Minute
//        result := gotime.DurationInWords(d)
//        // Returns: "2 hours 30 minutes"
func DurationInWords(d time.Duration) string <span class="cov8" title="1">{
        if d == 0 </span><span class="cov8" title="1">{
                return "0 seconds"
        }</span>

        // Handle negative durations
        <span class="cov8" title="1">negative := d &lt; 0
        if negative </span><span class="cov8" title="1">{
                d = -d
        }</span>

        <span class="cov8" title="1">var parts []string

        // Extract time components
        days := int(d.Hours()) / 24
        hours := int(d.Hours()) % 24
        minutes := int(d.Minutes()) % 60
        seconds := int(d.Seconds()) % 60

        // Build the string with appropriate units
        if days &gt; 0 </span><span class="cov8" title="1">{
                if days == 1 </span><span class="cov8" title="1">{
                        parts = append(parts, "1 day")
                }</span> else<span class="cov8" title="1"> {
                        parts = append(parts, fmt.Sprintf("%d days", days))
                }</span>
        }

        <span class="cov8" title="1">if hours &gt; 0 </span><span class="cov8" title="1">{
                if hours == 1 </span><span class="cov8" title="1">{
                        parts = append(parts, "1 hour")
                }</span> else<span class="cov8" title="1"> {
                        parts = append(parts, fmt.Sprintf("%d hours", hours))
                }</span>
        }

        <span class="cov8" title="1">if minutes &gt; 0 </span><span class="cov8" title="1">{
                if minutes == 1 </span><span class="cov8" title="1">{
                        parts = append(parts, "1 minute")
                }</span> else<span class="cov8" title="1"> {
                        parts = append(parts, fmt.Sprintf("%d minutes", minutes))
                }</span>
        }

        <span class="cov8" title="1">if seconds &gt; 0 &amp;&amp; len(parts) &lt; 2 </span><span class="cov8" title="1">{ // Only show seconds if we don't have 2+ larger units
                if seconds == 1 </span><span class="cov8" title="1">{
                        parts = append(parts, "1 second")
                }</span> else<span class="cov8" title="1"> {
                        parts = append(parts, fmt.Sprintf("%d seconds", seconds))
                }</span>
        }

        // Handle very small durations
        <span class="cov8" title="1">if len(parts) == 0 </span><span class="cov8" title="1">{
                return "less than 1 second"
        }</span>

        // Join parts appropriately
        <span class="cov8" title="1">var result string
        if len(parts) == 1 </span><span class="cov8" title="1">{
                result = parts[0]
        }</span> else<span class="cov8" title="1"> if len(parts) == 2 </span><span class="cov8" title="1">{
                result = parts[0] + " " + parts[1]
        }</span> else<span class="cov8" title="1"> {
                // For 3+ parts, use only the first 2 most significant units
                result = parts[0] + " " + parts[1]
        }</span>

        <span class="cov8" title="1">if negative </span><span class="cov8" title="1">{
                result = "-" + result
        }</span>

        <span class="cov8" title="1">return result</span>
}

// IsValidAge checks if the given birth date results in a valid age (not negative, not unreasonably old).
// This is useful for validating user input for birth dates.
//
// Example:
//
//        birthDate := time.Date(1990, 5, 15, 0, 0, 0, 0, time.UTC)
//        valid := gotime.IsValidAge(birthDate)
//        // Returns: true
func IsValidAge(birthDate time.Time, asOf ...time.Time) bool <span class="cov8" title="1">{
        var ref time.Time
        if len(asOf) &gt; 0 </span><span class="cov8" title="1">{
                ref = asOf[0]
        }</span> else<span class="cov8" title="1"> {
                ref = time.Now()
        }</span>

        // Birth date cannot be in the future
        <span class="cov8" title="1">if birthDate.After(ref) </span><span class="cov8" title="1">{
                return false
        }</span>

        // Calculate age in years
        <span class="cov8" title="1">years := YearsBetween(birthDate, ref)

        // Reasonable age limits (0 to 150 years) - use &lt;= for inclusive range
        return years &gt;= 0 &amp;&amp; years &lt;= 150</span>
}
</pre>

		<pre class="file" id="file1" style="display: none">package gotime

import "time"

// IsBusinessDay reports whether t is a business day (not a weekend or holiday).
//
// The weekends parameter specifies which weekdays are considered weekends
// (e.g., []time.Weekday{time.Saturday, time.Sunday}).
// The holidays parameter is a slice of time.Time representing holidays
// (only the date portion is considered, time is ignored).
//
// Example:
//        weekends := []time.Weekday{time.Saturday, time.Sunday}
//        holidays := []time.Time{time.Date(2025, 7, 4, 0, 0, 0, 0, time.UTC)}
//        isBusiness := gotime.IsBusinessDay(time.Now(), weekends, holidays...)
//        // isBusiness: true if today is not a weekend or holiday
func IsBusinessDay(t time.Time, weekends []time.Weekday, holidays ...time.Time) bool <span class="cov8" title="1">{
        for _, w := range weekends </span><span class="cov8" title="1">{
                if t.Weekday() == w </span><span class="cov8" title="1">{
                        return false
                }</span>
        }
        <span class="cov8" title="1">for _, h := range holidays </span><span class="cov8" title="1">{
                if sameDay(t, h) </span><span class="cov8" title="1">{
                        return false
                }</span>
        }
        <span class="cov8" title="1">return true</span>
}

// NextBusinessDay returns the next business day after t, skipping weekends and holidays.
//
// Example:
//        weekends := []time.Weekday{time.Saturday, time.Sunday}
//        holidays := []time.Time{time.Date(2025, 7, 4, 0, 0, 0, 0, time.UTC)}
//        nextBiz := gotime.NextBusinessDay(time.Now(), weekends, holidays...)
//        // nextBiz: the next date that is not a weekend or holiday
func NextBusinessDay(t time.Time, weekends []time.Weekday, holidays ...time.Time) time.Time <span class="cov8" title="1">{
        next := t.AddDate(0, 0, 1)
        for !IsBusinessDay(next, weekends, holidays...) </span><span class="cov8" title="1">{
                next = next.AddDate(0, 0, 1)
        }</span>
        <span class="cov8" title="1">return next</span>
}

// PrevBusinessDay returns the previous business day before t, skipping weekends and holidays.
//
// Example:
//        weekends := []time.Weekday{time.Saturday, time.Sunday}
//        holidays := []time.Time{time.Date(2025, 7, 4, 0, 0, 0, 0, time.UTC)}
//        prevBiz := gotime.PrevBusinessDay(time.Now(), weekends, holidays...)
//        // prevBiz: the previous date that is not a weekend or holiday
func PrevBusinessDay(t time.Time, weekends []time.Weekday, holidays ...time.Time) time.Time <span class="cov8" title="1">{
        prev := t.AddDate(0, 0, -1)
        for !IsBusinessDay(prev, weekends, holidays...) </span><span class="cov8" title="1">{
                prev = prev.AddDate(0, 0, -1)
        }</span>
        <span class="cov8" title="1">return prev</span>
}

// sameDay checks if two times are on the same year, month, and day.
func sameDay(a, b time.Time) bool <span class="cov8" title="1">{
        ay, am, ad := a.Date()
        by, bm, bd := b.Date()
        return ay == by &amp;&amp; am == bm &amp;&amp; ad == bd
}</span>
</pre>

		<pre class="file" id="file2" style="display: none">package gotime

import "time"

// DayOfYear returns the day number (1-366) within the year for the given date.
// This uses Go's built-in YearDay() method for optimal performance.
//
// Example:
//   gotime.DayOfYear(time.Date(2025, 1, 1, 0, 0, 0, 0, time.UTC))  // Returns 1
//   gotime.DayOfYear(time.Date(2025, 12, 31, 0, 0, 0, 0, time.UTC)) // Returns 365
//   gotime.DayOfYear(time.Date(2024, 12, 31, 0, 0, 0, 0, time.UTC)) // Returns 366 (leap year)
func DayOfYear(t time.Time) int <span class="cov8" title="1">{
        return t.YearDay()
}</span>

// WeekOfMonth returns the week number (1-5) within the month for the given date.
// The first week starts on the 1st of the month, regardless of the day of the week.
// This follows the common business calendar convention.
//
// Example:
//   gotime.WeekOfMonth(time.Date(2025, 7, 1, 0, 0, 0, 0, time.UTC))  // Returns 1
//   gotime.WeekOfMonth(time.Date(2025, 7, 7, 0, 0, 0, 0, time.UTC))  // Returns 2
//   gotime.WeekOfMonth(time.Date(2025, 7, 31, 0, 0, 0, 0, time.UTC)) // Returns 5
func WeekOfMonth(t time.Time) int <span class="cov8" title="1">{
        firstOfMonth := time.Date(t.Year(), t.Month(), 1, 0, 0, 0, 0, t.Location())
        firstWeekday := int(firstOfMonth.Weekday())
        return (t.Day()+firstWeekday-1)/7 + 1
}</span>

// IsFirstDayOfMonth returns true if the date is the first day of its month.
// This is a high-performance check that simply compares the day component.
//
// Example:
//   gotime.IsFirstDayOfMonth(time.Date(2025, 7, 1, 0, 0, 0, 0, time.UTC))  // Returns true
//   gotime.IsFirstDayOfMonth(time.Date(2025, 7, 2, 0, 0, 0, 0, time.UTC))  // Returns false
func IsFirstDayOfMonth(t time.Time) bool <span class="cov8" title="1">{
        return t.Day() == 1
}</span>

// IsLastDayOfMonth returns true if the date is the last day of its month.
// This efficiently checks by adding one day and seeing if the month changes.
// This approach correctly handles leap years and varying month lengths.
//
// Example:
//   gotime.IsLastDayOfMonth(time.Date(2025, 2, 28, 0, 0, 0, 0, time.UTC))  // Returns true (non-leap year)
//   gotime.IsLastDayOfMonth(time.Date(2024, 2, 29, 0, 0, 0, 0, time.UTC))  // Returns true (leap year)
//   gotime.IsLastDayOfMonth(time.Date(2025, 7, 31, 0, 0, 0, 0, time.UTC))  // Returns true
//   gotime.IsLastDayOfMonth(time.Date(2025, 7, 30, 0, 0, 0, 0, time.UTC))  // Returns false
func IsLastDayOfMonth(t time.Time) bool <span class="cov8" title="1">{
        nextDay := t.AddDate(0, 0, 1)
        return nextDay.Month() != t.Month()
}</span>
</pre>

		<pre class="file" id="file3" style="display: none">package gotime

import "github.com/maniartech/gotime/internal/nites"

// Convert parses a date-time string according to the source format and
// reformats it using the target format. Both formats use NITES
// (Natural and Intuitive Time Expression Syntax) format specifiers.
//
// Example:
//        converted, err := gotime.Convert("2022-12-31", "yyyy-mm-dd", "dt mmmm, yyyy")
//        if err != nil {
//                // handle error
//        }
//        // converted: "31st December, 2022"
func Convert(value, fromLayout, toLayout string) (string, error) <span class="cov8" title="1">{
        return nites.Convert(value, fromLayout, toLayout)
}</span>
</pre>

		<pre class="file" id="file4" style="display: none">package main

import (
        "fmt"
        "time"
)

// DaysInMonth returns the number of days in a given month of a given year
func DaysInMonth(year, month int) int <span class="cov0" title="0">{
        // Go to the first day of the next month, then subtract one day
        nextMonth := time.Date(year, time.Month(month+1), 1, 0, 0, 0, 0, time.UTC)
        firstOfMonth := time.Date(year, time.Month(month), 1, 0, 0, 0, 0, time.UTC)
        return int(nextMonth.Sub(firstOfMonth).Hours() / 24)
}</span>

func Age(birthDate time.Time, asOf time.Time) (years, months, days int) <span class="cov0" title="0">{
        // Use a more reliable approach: count years first, then months, then days
        birth := time.Date(birthDate.Year(), birthDate.Month(), birthDate.Day(), 0, 0, 0, 0, birthDate.Location())
        reference := time.Date(asOf.Year(), asOf.Month(), asOf.Day(), 0, 0, 0, 0, asOf.Location())

        fmt.Printf("Birth: %s\n", birth.Format("2006-01-02"))
        fmt.Printf("AsOf:  %s\n", reference.Format("2006-01-02"))

        // Start with the birth year and increment until we can't add more years
        currentDate := birth
        for </span><span class="cov0" title="0">{
                nextYear := currentDate.AddDate(1, 0, 0)
                if nextYear.After(reference) </span><span class="cov0" title="0">{
                        break</span>
                }
                <span class="cov0" title="0">years++
                currentDate = nextYear
                fmt.Printf("Added year %d, current date: %s\n", years, currentDate.Format("2006-01-02"))</span>
        }

        // Now add months
        <span class="cov0" title="0">for </span><span class="cov0" title="0">{
                nextMonth := currentDate.AddDate(0, 1, 0)
                if nextMonth.After(reference) </span><span class="cov0" title="0">{
                        break</span>
                }
                <span class="cov0" title="0">months++
                currentDate = nextMonth
                fmt.Printf("Added month %d, current date: %s\n", months, currentDate.Format("2006-01-02"))</span>
        }

        // Finally, count remaining days
        <span class="cov0" title="0">for currentDate.Before(reference) </span><span class="cov0" title="0">{
                days++
                currentDate = currentDate.AddDate(0, 0, 1)
                if days &lt;= 5 </span><span class="cov0" title="0">{ // Limit output for debugging
                        fmt.Printf("Added day %d, current date: %s\n", days, currentDate.Format("2006-01-02"))
                }</span>
        }

        <span class="cov0" title="0">return years, months, days</span>
}

func main() <span class="cov0" title="0">{
        // Test case 1: years, months, and days
        fmt.Println("=== Test 1: years, months, and days ===")
        birthDate1 := time.Date(1990, 5, 15, 0, 0, 0, 0, time.UTC)
        asOf1 := time.Date(2025, 7, 7, 0, 0, 0, 0, time.UTC)
        years1, months1, days1 := Age(birthDate1, asOf1)
        fmt.Printf("Expected: 35 years, 1 months, 23 days\n")
        fmt.Printf("Got:      %d years, %d months, %d days\n\n", years1, months1, days1)

        // Test case 2: leap year birthday
        fmt.Println("=== Test 2: leap year birthday ===")
        birthDate2 := time.Date(2000, 2, 29, 0, 0, 0, 0, time.UTC)
        asOf2 := time.Date(2025, 3, 1, 0, 0, 0, 0, time.UTC)
        years2, months2, days2 := Age(birthDate2, asOf2)
        fmt.Printf("Expected: 25 years, 0 months, 1 days\n")
        fmt.Printf("Got:      %d years, %d months, %d days\n\n", years2, months2, days2)
}</span>
</pre>

		<pre class="file" id="file5" style="display: none">package main

import (
        "fmt"
        "time"

        "github.com/maniartech/gotime"
)

func main() <span class="cov0" title="0">{
        now := time.Date(2025, 7, 7, 12, 0, 0, 0, time.UTC)
        fmt.Println("Now:", now)

        // Add 5 days
        future := gotime.Days(5, now)
        fmt.Println("5 days from now:", future)

        // Start of day
        startOfDay := gotime.SoD(now)
        fmt.Println("Start of day:", startOfDay)

        // Is business day
        weekends := []time.Weekday{time.Saturday, time.Sunday}
        holiday := time.Date(2025, 7, 4, 0, 0, 0, 0, time.UTC)
        isBiz := gotime.IsBusinessDay(now, weekends, holiday)
        fmt.Println("Is business day:", isBiz)
}</span>
</pre>

		<pre class="file" id="file6" style="display: none">package gotime

import (
        "time"

        "github.com/maniartech/gotime/internal/nites"
)

// Format converts a time.Time value to a formatted string using the specified layout.
// If layout is empty, RFC3339 format is used by default.
//
// The layout uses NITES (Natural and Intuitive Time Expression Syntax) format
// specifiers like "yyyy-mm-dd" instead of Go's reference time format.
//
// Example:
//
//        formatted := gotime.Format(time.Now(), "yyyy-mm-dd")
//        // formatted: "2025-07-08"
//
//        formatted = gotime.Format(time.Now(), "mmmm dd, yyyy")
//        // formatted: "July 08, 2025"
func Format(dt time.Time, layout string) string <span class="cov8" title="1">{
        if layout == "" </span><span class="cov8" title="1">{
                // Layout is RFC3339 by default
                layout = time.RFC3339
        }</span>
        <span class="cov8" title="1">return nites.Format(dt, layout)</span>
}

// FormatUnix converts Unix time (seconds and nanoseconds) to a formatted string
// using the specified layout. If layout is empty, RFC3339 format is used by default.
//
// Example:
//
//        formatted := gotime.FormatUnix(1609459200, 0, "yyyy-mm-dd")
//        // formatted: "2021-01-01"
func FormatUnix(sec int64, nsec int64, layout string) string <span class="cov8" title="1">{
        if layout == "" </span><span class="cov8" title="1">{
                // Layout is RFC3339 by default
                layout = time.RFC3339
        }</span>
        <span class="cov8" title="1">return nites.Format(time.Unix(sec, nsec), layout)</span>
}

// FormatTimestamp converts a Unix timestamp (seconds) to a formatted string
// using the specified layout. If layout is empty, RFC3339 format is used by default.
//
// Example:
//
//        formatted := gotime.FormatTimestamp(1609459200, "yyyy-mm-dd")
//        // formatted: "2021-01-01"
func FormatTimestamp(timestamp int64, layout string) string <span class="cov8" title="1">{
        if layout == "" </span><span class="cov8" title="1">{
                // Layout is RFC3339 by default
                layout = time.RFC3339
        }</span>
        <span class="cov8" title="1">return nites.Format(time.Unix(timestamp, 0), layout)</span>
}
</pre>

		<pre class="file" id="file7" style="display: none">package cache

var cache map[string]interface{}

func init() <span class="cov8" title="1">{
        cache = map[string]interface{}{}
}</span>

// Disable disables the cache. This is useful for testing or
// when you want to make sure that the cache is not used. Generally,
// many applications do not need to disable the cache due to the limited
// number of datetime formats that are used. However, if you are using
// unknown number of datetime formats, then you may want to disable
// the cache. The cache is enabled by default. To reenable the cache,
// use the Enable function.
func Disable() <span class="cov8" title="1">{
        cache = nil
}</span>

// Enable enables the cache. By default, the cache is enabled.
// This function is useful when you want to enable the cache after it has been
// disabled. See the Disable function for more information.
func Enable() <span class="cov8" title="1">{
        cache = map[string]interface{}{}
}</span>

// IsEnabled returns true if the cache is enabled. The cache is
// enabled by default. See the Disable function for more information.
func IsEnabled() bool <span class="cov8" title="1">{
        return cache != nil
}</span>

// Set sets the cache value for the given key. If the cache is disabled,
// this function does nothing.
func Set(key string, value interface{}) <span class="cov8" title="1">{
        if cache == nil </span><span class="cov8" title="1">{
                return
        }</span>
        <span class="cov8" title="1">cache[key] = value</span>
}

// Get returns the cache value for the given key. If the cache is disabled,
// this function returns nil.
func Get(key string) interface{} <span class="cov8" title="1">{
        if cache == nil </span><span class="cov8" title="1">{
                return nil
        }</span>
        <span class="cov8" title="1">return cache[key]</span>
}

func GetStrs(key string) []string <span class="cov8" title="1">{
        if cache == nil </span><span class="cov8" title="1">{
                return nil
        }</span>
        <span class="cov8" title="1">value, exists := cache[key]
        if !exists </span><span class="cov0" title="0">{
                return nil
        }</span>
        <span class="cov8" title="1">switch v := value.(type) </span>{
        case []string:<span class="cov8" title="1">
                return v</span>
        case string:<span class="cov8" title="1">
                return []string{v}</span>
        default:<span class="cov8" title="1">
                return nil</span>
        }
}
</pre>

		<pre class="file" id="file8" style="display: none">package nites

import (
        "errors"
        "strings"
        "time"

        "github.com/maniartech/gotime/internal/cache"
        "github.com/maniartech/gotime/internal/utils"
)

// Convert function converts a datetime from one string format to another.
// It takes the datetime string in the single format and converts it to the expected output.
// It returns an error when the format is not supported.
func Convert(dt string, from string, to string) (string, error) <span class="cov8" title="1">{
        if from == to </span><span class="cov8" title="1">{
                return dt, nil
        }</span>

        // Convert the format to go format. While parsing
        // the from layout, it may return an error if the format
        // contains ordinals (mt, dt).
        <span class="cov8" title="1">fromConverted, err := convertLayout(from, true)
        if err != nil </span><span class="cov8" title="1">{
                return "", err
        }</span>

        <span class="cov8" title="1">var fromLayout string
        switch v := fromConverted.(type) </span>{
        case []string:<span class="cov8" title="1">
                fromLayout = v[0]</span>
        default:<span class="cov8" title="1">
                fromLayout, _ = v.(string)</span>
        }

        <span class="cov8" title="1">toLayout, _ := convertLayout(to, false) // ConvertLayout never returns an error when forParsing is false

        t, err := time.Parse(fromLayout, dt)
        if err != nil </span><span class="cov8" title="1">{
                return "", err
        }</span>

        <span class="cov8" title="1">switch v := toLayout.(type) </span>{
        case []string:<span class="cov8" title="1">
                return formatStrs(t, v), nil</span>
        default:<span class="cov8" title="1">
                vstr, _ := v.(string)
                return t.Format(vstr), nil</span>
        }
}

// convertLayout converts this library datetime format to a go format.
// It loops through each character of the supplied format string
// and checks if it is a valid format character. If it is, it
// converts it to the go format.
//
// The function convert following format:
// yy     -&gt; 06         Two digit year with leading zero
// yyyy   -&gt; 2006       Four digit year
// m      -&gt; 1          Month without leading zero
// mm     -&gt; 01         Month in two digits with leading zero
// mt    -&gt;  1st        Month in ordinal format with leading zero (not supported during parsing)
// mmm    -&gt; Jan        Month in short name
// mmmm   -&gt; January    Month in full name
// d      -&gt; 2          Day without leading zero
// dd     -&gt; 02         Day in two digits with leading zero
// dt     -&gt; 2nd        Day in ordinal format with leading zero (not supported during parsing)

// ddd    -&gt; 002        Zero padded day of year
// www    -&gt; Mon        Three letter weekday name
// wwww   -&gt; Monday     Full weekday name

// h      -&gt; 3          Hour in 12 hour format without leading zero
// hh     -&gt; 03         Hour in 12 hour format with leading zero
// hhhh   -&gt; 15         Hour in 24 hour format with leading zero
// a      -&gt; pm         am/pm (lowercase)
// aa     -&gt; PM         AM/PM (uppercase)
// ii     -&gt; 04         Minute with leading zero
// i      -&gt; 4          Minute without leading zero
// ss     -&gt; 05         Second with leading zero
// s      -&gt; 5          Second without leading zero
// 0      -&gt; 0          Microsecond with leading zero
// 9      -&gt; 9          Microsecond without leading zero

// z      -&gt; Z                      The Z literal represents UTC
// zz     -&gt; MST        Timezone abbreviation
// o     -&gt; ±07                     Timezone offset with leading zero (only hours)
// oo    -&gt; ±0700       Timezone offset with leading zero without colon
// ooo   -&gt; ±07:00      Timezone offset with leading zero with colon
func convertLayout(f string, forParsing bool) (interface{}, error) <span class="cov8" title="1">{
        // Built-in format, return as is
        if version, ok := utils.BuiltInLayouts[f]; ok </span><span class="cov8" title="1">{
                if utils.RuntimeVersion &gt;= version </span><span class="cov8" title="1">{
                        return []string{f}, nil
                }</span>
        }

        // If the format is cached, return the cached value
        <span class="cov8" title="1">if v := cache.Get(f); v != nil </span><span class="cov8" title="1">{
                return v, nil
        }</span>

        // Convert format to lower case for case insensitive matching
        <span class="cov8" title="1">var converted interface{}

        // Initialize a map of format conversions
        conversions := map[string][][]string{
                "y": {{"yyyy", "2006"}, {"yy", "06"}},
                "m": {{"mmmm", "January"}, {"mmm", "Jan"}, {"mm", "01"}, {"mt", ""}, {"m", "1"}},
                "d": {{"ddd", "002"}, {"dd", "02"}, {"db", "_2"}, {"dt", ""}, {"d", "2"}}, // dt for ordinals
                "w": {{"wwww", "Monday"}, {"www", "Mon"}},
                "h": {{"hhhh", "15"}, {"hh", "03"}, {"h", "3"}},
                "a": {{"aa", "PM"}, {"a", "pm"}},
                "i": {{"ii", "04"}, {"i", "4"}},
                "s": {{"ss", "05"}, {"s", "5"}},

                // Timezone
                "z": {
                        {"zz", "MST"},
                        {"z", "Z"},
                },
                "o": {{"ooo", "-07:00"}, {"oo", "-0700"}, {"o", "-07"}},
        }

        // Initialize a new string builder
        to := strings.Builder{}

        // Loop through the input format
        i := 0
        for i &lt; len(f) </span><span class="cov8" title="1">{
                c := f[i]

                // If c is uppercase, convert it to lowercase
                if c &gt;= 'A' &amp;&amp; c &lt;= 'Z' </span><span class="cov8" title="1">{
                        c += 32
                }</span>

                // Check if the current character is an escape character
                <span class="cov8" title="1">if f[i] == '\\' </span><span class="cov8" title="1">{
                        // Check if we're not at the end of the format string
                        if i+1 &lt; len(f) </span><span class="cov8" title="1">{
                                // Append the next character as a literal, ignoring its format meaning
                                to.WriteString(string(f[i+1]))
                                i += 2
                        }</span> else<span class="cov8" title="1"> {
                                // We're at the end of the format string; append the escape character
                                to.WriteString(string(f[i]))
                                i++
                        }</span>
                        <span class="cov8" title="1">continue</span>
                }

                // Check if the current character is a valid format character
                <span class="cov8" title="1">conv, ok := conversions[string(c)]
                if !ok </span><span class="cov8" title="1">{
                        // Not a valid format character, add as is
                        to.WriteString(string(f[i]))
                        i++
                        continue</span>
                }

                // Valid format character, check for the longest possible match
                <span class="cov8" title="1">for _, keyVal := range conv </span><span class="cov8" title="1">{
                        key, val := keyVal[0], keyVal[1]
                        iEnd := i + len(key)

                        // Check if the len of key + i is less than the len of the format.
                        if iEnd &lt;= len(f) </span><span class="cov8" title="1">{
                                if f[i:iEnd] == key </span><span class="cov8" title="1">{
                                        if val == "" </span><span class="cov8" title="1">{
                                                if forParsing </span><span class="cov8" title="1">{
                                                        return nil, errors.New(errOrdinalsNotSupported)
                                                }</span>
                                                <span class="cov8" title="1">if converted == nil </span><span class="cov8" title="1">{
                                                        converted = []string{}
                                                }</span>
                                                <span class="cov8" title="1">converted = append(converted.([]string), to.String()) // Append the converted format
                                                converted = append(converted.([]string), key)         // Append the value to the converted format
                                                to.Reset()</span>
                                        }
                                        <span class="cov8" title="1">to.WriteString(val)
                                        i += len(key)
                                        goto MatchFound</span>
                                }
                        }
                }

                // If we get here, we didn't find a match, add the character as is
                <span class="cov8" title="1">if i &lt; len(f) </span><span class="cov8" title="1">{
                        to.WriteString(string(f[i]))
                        i++
                }</span>
        MatchFound:
        }

        // Cache the converted format
        <span class="cov8" title="1">finalConvert := to.String()
        if converted == nil </span><span class="cov8" title="1">{
                cache.Set(f, finalConvert)
                return finalConvert, nil
        }</span>

        <span class="cov8" title="1">converted = append(converted.([]string), finalConvert)

        cache.Set(f, converted)
        return converted, nil</span>
}
</pre>

		<pre class="file" id="file9" style="display: none">package nites

import (
        "fmt"
        "strconv"
        "time"
)

// This file contains the IDF (Intuitive Date Format) conversion functions
// for the gotime package.

// Format formats a time.Time value according to the given layout string.
// The layout uses intuitive date format (IDF) syntax instead of Go's reference time.
// Supports ordinal formatting for days (dt) and months (mt).
//
// Example formats:
//
//        "yyyy-mm-dd"     -&gt; "2025-07-07"
//        "dt of mmm"      -&gt; "7th of Jul"
//        "mt month"       -&gt; "7th month"
//
// See convertLayout documentation for complete format specification.
func Format(dt time.Time, layout string) string <span class="cov8" title="1">{
        convertedLayouts, _ := convertLayout(layout, false)
        if str, ok := convertedLayouts.(string); ok </span><span class="cov8" title="1">{
                return dt.Format(str)
        }</span>

        <span class="cov8" title="1">return formatStrs(dt, convertedLayouts.([]string))</span>
}

// formatStrs formats a time using multiple layout strings and concatenates the results.
// This function is used when the layout contains ordinal formats (dt, mt) that require
// special processing beyond standard Go time formatting.
func formatStrs(dt time.Time, convertedLayouts []string) string <span class="cov8" title="1">{