"Sat, 17 Jan 1970 07:55:40"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700117
Only TIME
07:55:40
General datetime
1970-01-17 07:55:40Z
For Database
1970-01-17 07:55:40
For HTTP1.1
Sat, 17 Jan 1970 07:55:40 GMT