"Mon, 12 Jan 1970 00:54:21"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700112
Only TIME
00:54:21
General datetime
1970-01-12 00:54:21Z
For Database
1970-01-12 00:54:21
For HTTP1.1
Mon, 12 Jan 1970 00:54:21 GMT