"Sat, 17 Jan 1970 11:21:18"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700117
Only TIME
11:21:18
General datetime
1970-01-17 11:21:18Z
For Database
1970-01-17 11:21:18
For HTTP1.1
Sat, 17 Jan 1970 11:21:18 GMT