"Wed, 14 Jan 1970 21:38:48"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700114
Only TIME
21:38:48
General datetime
1970-01-14 21:38:48Z
For Database
1970-01-14 21:38:48
For HTTP1.1
Wed, 14 Jan 1970 21:38:48 GMT