"Wed, 21 Jan 1970 00:40:09"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700121
Only TIME
00:40:09
General datetime
1970-01-21 00:40:09Z
For Database
1970-01-21 00:40:09
For HTTP1.1
Wed, 21 Jan 1970 00:40:09 GMT