"Wed, 07 Jan 1970 21:37:47"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700107
Only TIME
21:37:47
General datetime
1970-01-07 21:37:47Z
For Database
1970-01-07 21:37:47
For HTTP1.1
Wed, 07 Jan 1970 21:37:47 GMT