"Fri, 02 Jan 1970 15:18:50"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700102
Only TIME
15:18:50
General datetime
1970-01-02 15:18:50Z
For Database
1970-01-02 15:18:50
For HTTP1.1
Fri, 02 Jan 1970 15:18:50 GMT