"Sat, 07 Feb 1970 18:15:46"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700207
Only TIME
18:15:46
General datetime
1970-02-07 18:15:46Z
For Database
1970-02-07 18:15:46
For HTTP1.1
Sat, 07 Feb 1970 18:15:46 GMT