[flang] [llvm] [flang-rt] Add implementation for date_and_time on Windows (PR #190174)

[Tom Eccles via llvm-commits]

https://github.com/tblah commented:

Bumping the supported windows version seems okay to me but please wait for approval from somebody outside of Arm before merging

https://github.com/llvm/llvm-project/pull/190174