"Thu, 12 Feb 1970 22:40:46"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700212
Only TIME
22:40:46
General datetime
1970-02-12 22:40:46Z
For Database
1970-02-12 22:40:46
For HTTP1.1
Thu, 12 Feb 1970 22:40:46 GMT