"Sat, 03 Jan 1970 11:21:23"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700103
Only TIME
11:21:23
General datetime
1970-01-03 11:21:23Z
For Database
1970-01-03 11:21:23
For HTTP1.1
Sat, 03 Jan 1970 11:21:23 GMT