"Wed, 21 Jan 1970 07:55:43"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700121
Only TIME
07:55:43
General datetime
1970-01-21 07:55:43Z
For Database
1970-01-21 07:55:43
For HTTP1.1
Wed, 21 Jan 1970 07:55:43 GMT