SRFI 19: Time Data Types and Procedures

This is a Chibi Scheme port of the Standard Implementation of SRFI 19.

The bulk of the code is from the standard implementation, with only a few tweaks to make it work under Chibi Scheme. The test suite has been expanded so that each exported function is exercised at least once.

The full source of this version is available on GitHub.

Many thanks to Will Fitzgerald and the SRFI Editors for providing the SRFI and the standard implementation code.

Extensions to SRFI 19

This implementation has two new format directives that I'd really rather were better supported everywhere.

• ~g - day of month. It just outputs the day of the month (1...31). The other two standard directives both specify either blank padding or zero padding but there's no option for no padding.
• ~u - day ordinal suffix. Outputs the locale-specific suffix for the day of the month. For example "rd" for 3, "th" for 6, or "st" for 21. This allows you to format dates as "Sunday, 1st of January 2017". It's possible to insert the "st" in such a format string manually but that doesn't seem a clean approach.