From https://raw.githubusercontent.com/git/git/master/Documentation/RelNotes/2.45.0.txt > * The output format for dates "iso-strict" has been tweaked to show > a time in the Zulu timezone with "Z" suffix, instead of "+00:00". https://github.com/git/git/commit/69e2bee1a3ba2f9367d55992f401e6365be100ea > Subject: [PATCH] date: make "iso-strict" conforming for the UTC timezone > > ISO 8601-1:2020-12 specifies that a zero timezone offset must be denoted > with a "Z" suffix instead of the numeric "+00:00". Add the correponding > special case to show_date() and a new test. > > Changing an established output format which might be depended on by > scripts is always problematic, but here we choose to adhere more closely > to the published standard.