"Sat, 21 Feb 1970 07:51:02"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700221
Only TIME
07:51:02
General datetime
1970-02-21 07:51:02Z
For Database
1970-02-21 07:51:02
For HTTP1.1
Sat, 21 Feb 1970 07:51:02 GMT