"Tue, 06 Jan 1970 09:15:55"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700106
Only TIME
09:15:55
General datetime
1970-01-06 09:15:55Z
For Database
1970-01-06 09:15:55
For HTTP1.1
Tue, 06 Jan 1970 09:15:55 GMT