"Mon, 05 Jan 1970 21:44:18"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700105
Only TIME
21:44:18
General datetime
1970-01-05 21:44:18Z
For Database
1970-01-05 21:44:18
For HTTP1.1
Mon, 05 Jan 1970 21:44:18 GMT