"Fri, 02 Jan 1970 21:37:42"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700102
Only TIME
21:37:42
General datetime
1970-01-02 21:37:42Z
For Database
1970-01-02 21:37:42
For HTTP1.1
Fri, 02 Jan 1970 21:37:42 GMT