"Sat, 10 Jan 1970 14:45:23"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700110
Only TIME
14:45:23
General datetime
1970-01-10 14:45:23Z
For Database
1970-01-10 14:45:23
For HTTP1.1
Sat, 10 Jan 1970 14:45:23 GMT