1901-01-01 00:00:00 (-2177452800 seconds) 1901-01-01 00:00:00 1968-12-31 23:59:59 (-31536001 seconds) 1968-12-31 23:59:59 1969-01-01 00:00:00 (-31536000 seconds) 1969-01-01 00:00:00 1969-12-31 23:59:59 (-1 seconds) 1969-12-31 23:59:59 1970-01-01 00:00:01 (1 seconds) 1970-01-01 00:00:01