"Sat, 14 Feb 1970 11:25:44"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700214
Only TIME
11:25:44
General datetime
1970-02-14 11:25:44Z
For Database
1970-02-14 11:25:44
For HTTP1.1
Sat, 14 Feb 1970 11:25:44 GMT