"Sat, 10 Jan 1970 14:18:44"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700110
Only TIME
14:18:44
General datetime
1970-01-10 14:18:44Z
For Database
1970-01-10 14:18:44
For HTTP1.1
Sat, 10 Jan 1970 14:18:44 GMT