"Wed, 21 Jan 1970 03:26:15"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700121
Only TIME
03:26:15
General datetime
1970-01-21 03:26:15Z
For Database
1970-01-21 03:26:15
For HTTP1.1
Wed, 21 Jan 1970 03:26:15 GMT