Assign unique ID to sorted, unique dates

Hello everyone,

Could you help me out? For my work I use a task-decision list in which I have to manually assing unique ID's (numerical values) to every meeting and every task. So let's say I had a meeting with company A on 1-1-2018 that resulted in 4 tasks; the 'meeting-ID' for each of those 4 tasks will be a '1'.

Functional: I would like to automate the generation of this ID.
Technical: I want the formula to do two things: 1) define unique dates per company, 2) assign a numerical value to those dates based on the chronological sequence.

I've included an attachment that shows and describes the problem in a bit more detail. Hope to hear/learn from you guys.

Will you please attach a SMALL sample Excel workbook (10-20 rows of data is usually enough)? Please don't attach a picture of one (no-one will want to re-type all your stuff before starting).

1. Make sure that your sample data are truly REPRESENTATIVE of your real data. The use of unrepresentative data is very frustrating and can lead to long delays in reaching a solution.

2. Make sure that your desired solution is also shown (mock up the results manually).

3. Make sure that all confidential information is removed first!!

4. Try to avoid using merged cells. They cause lots of problems!

Unfortunately the attachment icon doesn't work at the moment. So, to attach an Excel file you have to do the following: Just before posting, scroll down to Go Advanced and then scroll down to Manage Attachments. Now follow the instructions at the top of that screen.

Hi. My head started to fry when I read this. I've made what I think is an intelligent guess. But I'm not sure as there were too many words and not enough examples of what was right and what was wrong. I added an extra column, with a number. This locks the rest of it together.

Then in D2:

=SUMPRODUCT((C2 > C$2:C$12)*($B$2:$B$12=B2)/COUNTIFS(C$2:C$12,C$2:C$12,$B$2:$B$12,$B$2:$B$12))+1+[@Column2]/10^10

and in A2:

=IF([@date]="","",UPPER(LEFT(E2,1))&"-"&[company]&"-"&TEXT([@Column1],"0")&"-"&COUNTIFS($C$1:$C2,$C2,$E$1:$E2,$E2))