"Sat, 17 Jan 1970 00:40:18"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700117
Only TIME
00:40:18
General datetime
1970-01-17 00:40:18Z
For Database
1970-01-17 00:40:18
For HTTP1.1
Sat, 17 Jan 1970 00:40:18 GMT