"Mon, 05 Jan 1970 07:56:40"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700105
Only TIME
07:56:40
General datetime
1970-01-05 07:56:40Z
For Database
1970-01-05 07:56:40
For HTTP1.1
Mon, 05 Jan 1970 07:56:40 GMT