"Fri, 02 Jan 1970 21:48:19"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700102
Only TIME
21:48:19
General datetime
1970-01-02 21:48:19Z
For Database
1970-01-02 21:48:19
For HTTP1.1
Fri, 02 Jan 1970 21:48:19 GMT