"Wed, 14 Jan 1970 21:48:03"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700114
Only TIME
21:48:03
General datetime
1970-01-14 21:48:03Z
For Database
1970-01-14 21:48:03
For HTTP1.1
Wed, 14 Jan 1970 21:48:03 GMT