"Sat, 07 Feb 1970 00:20:35"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700207
Only TIME
00:20:35
General datetime
1970-02-07 00:20:35Z
For Database
1970-02-07 00:20:35
For HTTP1.1
Sat, 07 Feb 1970 00:20:35 GMT