obs-countdown-timer/index.html at master · sunmockyang/obs-countdown-timer · GitHub

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<html>
    <head>
        <style>
            /* @import url('https://fonts.googleapis.com/css2?family=Jost:ital,wght@1,500&display=swap'); */
            /* @import url('https://fonts.googleapis.com/css2?family=Jost:ital@1&display=swap'); */
            /* @import url('https://fonts.googleapis.com/css2?family=Jost&display=swap'); */
            @import url('https://fonts.googleapis.com/css2?family=Roboto:ital@1&display=swap');
            /* @import url('https://fonts.googleapis.com/css2?family=Open+Sans:ital@1&display=swap'); */

            body {
                background-color: black;
                color: white;
            }

            #countdownContainer {
                /* font-family: 'Jost', sans-serif; */
                font-family: 'Roboto', sans-serif;
                /* font-family: 'Open Sans', sans-serif; */
                font-size: 2rem;
                width: 100%;
                text-align: center;
            }
        </style>
        <script>
            // Calculate target time to everday at 1:00pm
            let targetTime = new Date();
            targetTime.setHours(13, 0, 0);

            const TARGET_TIME = targetTime;
            const COUNTDOWN_COMPLETE_MESSAGE = "Service will begin soon";
            let currentCountdownText = "";
            let countdownContainer = null;

            function getCountdownMessage(timeLeftMs) {
                const timeLeftS = Math.floor(timeLeftMs / 1000);
                const timeLeftMinutes = Math.floor(timeLeftMs / 1000 / 60);

                let countdownMessage = null;

                if (timeLeftMinutes > 0) {
                    let minuteText = (timeLeftMinutes > 1) ? "minutes" : "minute"
                    countdownMessage = `Service will begin in ${timeLeftMinutes} ${minuteText}`;
                }

                return countdownMessage;
            }

            function tick() {
                const currentTime = new Date();
                const timeLeftMs = TARGET_TIME - currentTime;

                let countdownMessage = getCountdownMessage(timeLeftMs);
                if (countdownMessage === null) {
                    countdownMessage = COUNTDOWN_COMPLETE_MESSAGE;
                }

                // Reduce draws to the screen
                if (currentCountdownText !== countdownMessage) {
                    countdownContainer.innerHTML = countdownMessage;
                    currentCountdownText = countdownMessage;
                }

                // Calls tick whenever the next frame is available
                window.requestAnimationFrame(tick);
            }

            function main() {
                countdownContainer = document.getElementById("countdownContainer");
                tick();
            }

            window.onload = main;
        </script>
    </head>
    <body>
        <div id="countdownContainer"></div>
    </body>
</html>