:format:%s for date fields seems to be shifted by timezone

Hello!

my current timezone is UTC+0200.

I create a test repo, add one commit and create a tag:

Now:

$ git for-each-ref --format="%(taggerdate:format:%s)" refs/tags 1588504146

$ date +"%s" 1588500585

$ git for-each-ref --format="%(taggerdate:raw)" refs/tags 1588500546 +0200

Somehow %(taggerdate:format:%s) gives a Unix timestamp which is one hour in future and it is different than what ` date +"%s"` gives around approximately the same time the tag was created.

clime