"Sat, 03 Jan 1970 14:30:44"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700103
Only TIME
14:30:44
General datetime
1970-01-03 14:30:44Z
For Database
1970-01-03 14:30:44
For HTTP1.1
Sat, 03 Jan 1970 14:30:44 GMT