"Sat, 17 Jan 1970 07:56:47"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700117
Only TIME
07:56:47
General datetime
1970-01-17 07:56:47Z
For Database
1970-01-17 07:56:47
For HTTP1.1
Sat, 17 Jan 1970 07:56:47 GMT