"Sat, 17 Jan 1970 15:08:20"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700117
Only TIME
15:08:20
General datetime
1970-01-17 15:08:20Z
For Database
1970-01-17 15:08:20
For HTTP1.1
Sat, 17 Jan 1970 15:08:20 GMT