"Sat, 21 Mar 1970 07:11:23"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700321
Only TIME
07:11:23
General datetime
1970-03-21 07:11:23Z
For Database
1970-03-21 07:11:23
For HTTP1.1
Sat, 21 Mar 1970 07:11:23 GMT