How to find the first date on a value

Glaglagla

New Member
Joined
Jun 2, 2015
Messages
9
Hello,

First of all, I'm sorry in advance if I'm not clear enough. I tried to post my problem on a french forum but nobody answers, so I'm trying out there but my english isn't perfect at all. Thanks for you patience.

Working on Power Pivot. XL 2013.
So, I'm working on a file wich contains Program ID, broadcast dates, platforms delivery, channel, and definition. Program ID are all duplicated because a program is broadcasted on several platforms (PC, TV, etc.), on several channels (VOD, etc.), and several definition (SD, HD).
I used a DISTINCTCOUNT to count the programs that we worked on, and it works perfectly if I do not include months in my table; in fact, if a programm is broadcasted first in january in SD, and then broadcasted in february in HD, it will be taken into the accounts of both month, BUT I only want to see the first broadcast date (I want to count, monthly, the number Of new program that are broadcasted).

So I would like to "tag" the first broadcast date by using a power pivot formula, creating a calculated column "first broadcast" with yes/no and then, change my DISTINCTCOUNT by CALCULATE(DISTINCTCOUNT(IDProgram);FirstBroadcast="yes").

And I cannot find the formula to tag the first broadcast date.

Am I clear enough?

Thank you for your help!
Gladys
 

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