"Thu, 15 Jan 1970 21:42:45"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700115
Only TIME
21:42:45
General datetime
1970-01-15 21:42:45Z
For Database
1970-01-15 21:42:45
For HTTP1.1
Thu, 15 Jan 1970 21:42:45 GMT