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date Hints and Tips
The date(1) command is often useful, but some of its syntax is dangerously close to black magic. :)
These are rituals[esc]dbwacommand lines that I've had to use, in case somebody (future me included) needs them.
Timezone conversion
To convert from some timezone to your own:
date -d "[YYYY-MM-DD] HH:MM TZ"
if no day is specified the current day is used, e.g. (on 2012-04-04):
$ date -d "9:00 UTC" Wed Apr 4 11:00:00 CEST 2012 $ date -d "2012-04-04 9:00 UTC" Wed Apr 4 11:00:00 CEST 2012 $ date -d "2012-03-04 9:00 UTC" Sun Mar 4 10:00:00 CET 2012
To convert from your (or any other) timezone to some other timezone:
TZ='DestTZ' date -d 'TZ="OrigTZ" [YYYY-MM-DD] HH:MM'
e.g.:
$ TZ=UTC date -d 'TZ="Europe/Rome" 9:00' Wed Apr 4 07:00:00 UTC 2012 $ TZ=UTC date -d 'TZ="Europe/Rome" 2012-04-04 9:00' Wed Apr 4 07:00:00 UTC 2012 $ TZ=UTC date -d 'TZ="Europe/Rome" 2012-03-04 9:00' Sun Mar 4 08:00:00 UTC 2012
This also works:
$ TZ=UTC date -d "9:00 CEST" Wed Apr 4 07:00:00 UTC 2012 $ TZ=UTC date -d "2012-04-04 9:00 CEST" Wed Apr 4 07:00:00 UTC 2012
But you don't get automagical DST management:
$ TZ=UTC date -d "2012-03-04 9:00 CEST" Sun Mar 4 07:00:00 UTC 2012
(this is formally correct, except that AFAIK no country was using CEST on 4 March).
