Your local time is , , UTC

now | [ iso date ] date

seconds,days since|between 1970-01-01 01:00:00 Z (UNIX %s)

seconds days since|between 0000-00-00 00:00:00 Z (mysql TO_SECONDS(), TO_DAYS())

days since|between 1900-01-01 00:00:00 Z (M$ Excel DAY(), WEEKDAY(); index starts from 1, 1900 is assumed a leap year (incorrectly) for Lotus123 compatibility (+1))

seconds,days since|between 1904-01-01 00:00:00 Z (M$ Excel for Mac <2016 DAY(), WEEKDAY(); index starts from 1)