"Sat, 03 Jan 1970 18:14:56"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700103
Only TIME
18:14:56
General datetime
1970-01-03 18:14:56Z
For Database
1970-01-03 18:14:56
For HTTP1.1
Sat, 03 Jan 1970 18:14:56 GMT