Differences in time between the start date and end Date

I have a requirement to get the difference between the two dates, I am on the syntax below to fill, but it does not work. The syntax is the following:
TimestampDiff (SQL_TSI_MONTH, "[< dStart_Date_ITAG >]", '[< dEnd_Date_ITAG >]'). Could you please help me on this. Thanks in advance

Olivier

Hello Roytson,

I want to enjoy the sytem itself, I mean there are 2 custom fields start date and enddate, my function should take system only do not enter manually.
could you please develop this thing.

Tags: Oracle

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