"Sat, 07 Feb 1970 14:57:20"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700207
Only TIME
14:57:20
General datetime
1970-02-07 14:57:20Z
For Database
1970-02-07 14:57:20
For HTTP1.1
Sat, 07 Feb 1970 14:57:20 GMT