"Mon, 05 Jan 1970 14:07:21"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700105
Only TIME
14:07:21
General datetime
1970-01-05 14:07:21Z
For Database
1970-01-05 14:07:21
For HTTP1.1
Mon, 05 Jan 1970 14:07:21 GMT