"Sat, 07 Feb 1970 12:33:37"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700207
Only TIME
12:33:37
General datetime
1970-02-07 12:33:37Z
For Database
1970-02-07 12:33:37
For HTTP1.1
Sat, 07 Feb 1970 12:33:37 GMT