"Sat, 17 Jan 1970 09:23:04"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700117
Only TIME
09:23:04
General datetime
1970-01-17 09:23:04Z
For Database
1970-01-17 09:23:04
For HTTP1.1
Sat, 17 Jan 1970 09:23:04 GMT