"Mon, 05 Jan 1970 21:38:37"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700105
Only TIME
21:38:37
General datetime
1970-01-05 21:38:37Z
For Database
1970-01-05 21:38:37
For HTTP1.1
Mon, 05 Jan 1970 21:38:37 GMT