"Fri, 13 Feb 1970 18:15:55"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700213
Only TIME
18:15:55
General datetime
1970-02-13 18:15:55Z
For Database
1970-02-13 18:15:55
For HTTP1.1
Fri, 13 Feb 1970 18:15:55 GMT