"Wed, 07 Jan 1970 00:40:43"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700107
Only TIME
00:40:43
General datetime
1970-01-07 00:40:43Z
For Database
1970-01-07 00:40:43
For HTTP1.1
Wed, 07 Jan 1970 00:40:43 GMT