"Sat, 17 Jan 1970 19:45:55"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700117
Only TIME
19:45:55
General datetime
1970-01-17 19:45:55Z
For Database
1970-01-17 19:45:55
For HTTP1.1
Sat, 17 Jan 1970 19:45:55 GMT