"Sat, 17 Jan 1970 15:07:57"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700117
Only TIME
15:07:57
General datetime
1970-01-17 15:07:57Z
For Database
1970-01-17 15:07:57
For HTTP1.1
Sat, 17 Jan 1970 15:07:57 GMT