"Sat, 10 Jan 1970 21:13:15"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700110
Only TIME
21:13:15
General datetime
1970-01-10 21:13:15Z
For Database
1970-01-10 21:13:15
For HTTP1.1
Sat, 10 Jan 1970 21:13:15 GMT