"Sat, 07 Feb 1970 14:56:37"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700207
Only TIME
14:56:37
General datetime
1970-02-07 14:56:37Z
For Database
1970-02-07 14:56:37
For HTTP1.1
Sat, 07 Feb 1970 14:56:37 GMT