"Sat, 17 Jan 1970 11:25:56"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700117
Only TIME
11:25:56
General datetime
1970-01-17 11:25:56Z
For Database
1970-01-17 11:25:56
For HTTP1.1
Sat, 17 Jan 1970 11:25:56 GMT