"Thu, 15 Jan 1970 23:38:48"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700115
Only TIME
23:38:48
General datetime
1970-01-15 23:38:48Z
For Database
1970-01-15 23:38:48
For HTTP1.1
Thu, 15 Jan 1970 23:38:48 GMT