"Sat, 10 Jan 1970 19:40:13"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700110
Only TIME
19:40:13
General datetime
1970-01-10 19:40:13Z
For Database
1970-01-10 19:40:13
For HTTP1.1
Sat, 10 Jan 1970 19:40:13 GMT