support for parsing date string with only time

[matrixhead]

Hi, i was trying to fix the date-sec test case in gnu test coverage in coreutils-date and i figured if i could make parse_datetime to take strings with only time and offset it would fix the issue and from the code I figured you guys are already working on a parser but as a temporary fix i wrote the following code to deal with the issue. Please do let me know if this not the way it was supposed to be implemented or any kind of change at all. Thank you

[codecov]

Codecov Report

Attention: Patch coverage is 92.06349% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 68.30%. Comparing base (83e1431) to head (249c079).
Report is 58 commits behind head on main.

Files	Patch %	Lines
src/lib.rs	0.00%	2 Missing and 1 partial ⚠️
src/parse_time_only_str.rs	96.66%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #65      +/-   ##
==========================================
+ Coverage   64.97%   68.30%   +3.32%     
==========================================
  Files           3        6       +3     
  Lines         454      795     +341     
  Branches       93      188      +95     
==========================================
+ Hits          295      543     +248     
- Misses        111      130      +19     
- Partials       48      122      +74     

Flag	Coverage Δ
macos_latest	68.30% <92.06%> (+3.32%)	⬆️
ubuntu_latest	67.29% <90.47%> (+2.31%)	⬆️
windows_latest	7.61% <9.52%> (-60.36%)	⬇️

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[tertsdiepraam]

I'd have to look into this, but I wouldn't mind merging this as a temporary solution indeed. I'll have to continue my work on the new parser. Looks useful to have in the meantime!

[matrixhead]

thanks 😄, i think i fixed the clippy and fmt errors is there anything else i should do?

[tertsdiepraam]

Nope, looks pretty good!