"Fri, 02 Jan 1970 18:15:45"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700102
Only TIME
18:15:45
General datetime
1970-01-02 18:15:45Z
For Database
1970-01-02 18:15:45
For HTTP1.1
Fri, 02 Jan 1970 18:15:45 GMT