"Wed, 14 Jan 1970 21:42:33"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700114
Only TIME
21:42:33
General datetime
1970-01-14 21:42:33Z
For Database
1970-01-14 21:42:33
For HTTP1.1
Wed, 14 Jan 1970 21:42:33 GMT