"Sat, 03 Jan 1970 01:18:23"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700103
Only TIME
01:18:23
General datetime
1970-01-03 01:18:23Z
For Database
1970-01-03 01:18:23
For HTTP1.1
Sat, 03 Jan 1970 01:18:23 GMT