"Thu, 01 Jan 1970 00:39:48"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700101
Only TIME
00:39:48
General datetime
1970-01-01 00:39:48Z
For Database
1970-01-01 00:39:48
For HTTP1.1
Thu, 01 Jan 1970 00:39:48 GMT