These are functions related to the date and time dimensions created by the script posted here:http://www.sqlservercentral.com/scripts/TSQL/65762/
There are three functions. Copy them and run them in the same place where you have your dim_Date and dim_Time dimension tables.
There are example calls for each function in the comments section of each function.
SELECT dbo.WHSE_fnGetDateKey(getdate()) [DATEID], dbo.WHSE_fnGetTimeKey(getdate()) [TIMEID]
This is a vital piece for quickly and easily converting your datetime strings into the IDs for the date and time dimensions prior to storage in your fact tables.