"Thu, 15 Jan 1970 02:27:42"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700115
Only TIME
02:27:42
General datetime
1970-01-15 02:27:42Z
For Database
1970-01-15 02:27:42
For HTTP1.1
Thu, 15 Jan 1970 02:27:42 GMT