Krishna Nagam

date: fix %Z specifier does not print TZ abbr

11

fixes issue https://github.com/uutils/coreutils/issues/3756 for date util description: `chrono` crate ignores %Z specifier. only prints timezone offset. added crates `chrono-tz` and `iana_time_zone` to calculate the timezone abbreviation and replace %Z specifier...

date: Implement custom datatime formatter, move away from chrono's strftime

2

## Chrono's strftime Format Deviations from GNU's Chrono's strftime implementation differs from GNU date, and it is unlikely that Chrono will modify its format specifiers to align with GNU's behavior....