"Mon, 05 Jan 1970 21:46:15"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700105
Only TIME
21:46:15
General datetime
1970-01-05 21:46:15Z
For Database
1970-01-05 21:46:15
For HTTP1.1
Mon, 05 Jan 1970 21:46:15 GMT