"Sat, 17 Jan 1970 21:48:10"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700117
Only TIME
21:48:10
General datetime
1970-01-17 21:48:10Z
For Database
1970-01-17 21:48:10
For HTTP1.1
Sat, 17 Jan 1970 21:48:10 GMT