"Wed, 21 Jan 1970 02:46:43"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700121
Only TIME
02:46:43
General datetime
1970-01-21 02:46:43Z
For Database
1970-01-21 02:46:43
For HTTP1.1
Wed, 21 Jan 1970 02:46:43 GMT