"Sat, 07 Feb 1970 19:39:36"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700207
Only TIME
19:39:36
General datetime
1970-02-07 19:39:36Z
For Database
1970-02-07 19:39:36
For HTTP1.1
Sat, 07 Feb 1970 19:39:36 GMT