"Sat, 10 Jan 1970 14:49:15"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700110
Only TIME
14:49:15
General datetime
1970-01-10 14:49:15Z
For Database
1970-01-10 14:49:15
For HTTP1.1
Sat, 10 Jan 1970 14:49:15 GMT