"Sat, 07 Feb 1970 23:30:48"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700207
Only TIME
23:30:48
General datetime
1970-02-07 23:30:48Z
For Database
1970-02-07 23:30:48
For HTTP1.1
Sat, 07 Feb 1970 23:30:48 GMT