"Thu, 15 Jan 1970 23:38:56"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700115
Only TIME
23:38:56
General datetime
1970-01-15 23:38:56Z
For Database
1970-01-15 23:38:56
For HTTP1.1
Thu, 15 Jan 1970 23:38:56 GMT