How to repeat:
date -d '2011-08-21 + 1 DAY' +%Y-%m-%d date -d '2010-10-10 + 1 DAY' +%Y-%m-%d These dates is just when change from normal time UTC-4 to dts UCT-3 result: invalid date The same operation with --utc works fine. date -d '2011-08-21 + 1 DAY' +%Y-%m-%d --utc date -d '2010-10-10 + 1 DAY' +%Y-%m-%d --utc
