"Sat, 17 Jan 1970 18:26:02"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700117
Only TIME
18:26:02
General datetime
1970-01-17 18:26:02Z
For Database
1970-01-17 18:26:02
For HTTP1.1
Sat, 17 Jan 1970 18:26:02 GMT