"Sat, 03 Jan 1970 09:20:12"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700103
Only TIME
09:20:12
General datetime
1970-01-03 09:20:12Z
For Database
1970-01-03 09:20:12
For HTTP1.1
Sat, 03 Jan 1970 09:20:12 GMT