"Tue, 13 Jan 1970 23:30:55"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700113
Only TIME
23:30:55
General datetime
1970-01-13 23:30:55Z
For Database
1970-01-13 23:30:55
For HTTP1.1
Tue, 13 Jan 1970 23:30:55 GMT