"Sat, 03 Jan 1970 07:39:23"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700103
Only TIME
07:39:23
General datetime
1970-01-03 07:39:23Z
For Database
1970-01-03 07:39:23
For HTTP1.1
Sat, 03 Jan 1970 07:39:23 GMT