"Wed, 21 Jan 1970 07:13:37"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700121
Only TIME
07:13:37
General datetime
1970-01-21 07:13:37Z
For Database
1970-01-21 07:13:37
For HTTP1.1
Wed, 21 Jan 1970 07:13:37 GMT