"Mon, 05 Jan 1970 04:38:14"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700105
Only TIME
04:38:14
General datetime
1970-01-05 04:38:14Z
For Database
1970-01-05 04:38:14
For HTTP1.1
Mon, 05 Jan 1970 04:38:14 GMT