"Sat, 17 Jan 1970 09:21:58"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700117
Only TIME
09:21:58
General datetime
1970-01-17 09:21:58Z
For Database
1970-01-17 09:21:58
For HTTP1.1
Sat, 17 Jan 1970 09:21:58 GMT