"Mon, 05 Jan 1970 09:21:16"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700105
Only TIME
09:21:16
General datetime
1970-01-05 09:21:16Z
For Database
1970-01-05 09:21:16
For HTTP1.1
Mon, 05 Jan 1970 09:21:16 GMT