Add functions for time formatting #5

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1. alt-graph

   added

   enhancementNew feature or requestNew feature or request

   on Jul 18, 2022
2. Finii commented on Jul 18, 2022

   

   Finii

   on Jul 18, 2022

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   Hmm, I'd like to see Howards date as a 'backport-ish' thing, like optional.
   It's single header. I usually just grab that one file and throw it into my source-tree, but would rather like to have it in GUL instead.

   Newer description with other date-time stuff here: https://github.com/HowardHinnant/date

   And it has subsecond resolution. Usually use it like this

       auto tp = system_clock::now();
       std::cout << tp << '\n';

       2015-04-19 18:24:42.770911
   

   Of course you can generate the unreadable ISO 8601 or, as I prefer RFCs over ISO, RFC 3389 strings.

   So, if you look again at the RFC document. RFC 3339 use/follow the ISO 8601 profile for the Internet DateTime. Clearly stated in chapter 5.6

   So actually, there are no big differences between Date ISO 8601. The only small thing that makes these 2 different is the “T” syntax between date and time. ISO 8601 uses the “T” character to separate the date and time. In RFC 3339, you can replace the “T” character with only using space.

   For example:

   # This is acceptable in ISO 8601 and RFC 3339 (with T)
   2019-10-12T07:20:50.52Z
   # This is only accepted in RFC 3339 (without T)
   2019-10-12 07:20:50.52Z
   

   Source here for an interested reader

   Of course any formatting is possible, as with the C style format string, by std::formatter I mean, no that is C++20, but date::format

   If we need timezones, that is another header file. I never used this.
3. gul-cpp

   locked and limited conversation to collaborators on Jul 19, 2022
4. Finii

   converted this issue into a discussion #7 on Jul 19, 2022