s3tools/s3cmd — pull request #453 by lamby (2014-12-28 10:48:11+00:00)
Title: Support relative expiry times in signurl

UNIX timestamps are annoying on the command line, eg. compare:

$ s3cmd signurl s3://bucket/filename $(($(date +%s) + 60))

vs.

$ s3cmd signurl s3://bucket/filename +60

Both times are still relative to the local clock of course, but at least
this is easier to read and play around with.