"Sat, 07 Feb 1970 21:42:49"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700207
Only TIME
21:42:49
General datetime
1970-02-07 21:42:49Z
For Database
1970-02-07 21:42:49
For HTTP1.1
Sat, 07 Feb 1970 21:42:49 GMT