> Right, it seems to validate against the local timezone before it has > checked whether the string specifies another timezone.
Looks like it: $ TZ=Europe/London date --date "2017-03-26T01:00:00+0000" date: invalid date ‘2017-03-26T01:00:00+0000’ $ TZ=Europe/Amsterdam date --date "2017-03-26T02:00:00+0000" date: invalid date ‘2017-03-26T02:00:00+0000’ Chris
