"Mon, 05 Jan 1970 20:37:13"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700105
Only TIME
20:37:13
General datetime
1970-01-05 20:37:13Z
For Database
1970-01-05 20:37:13
For HTTP1.1
Mon, 05 Jan 1970 20:37:13 GMT