DAX Days between two dates in different tables with filter

[IsaacAsher]

I have a table I'm trying to summarize:

Master table
ID    Worked
1      1/1/2018

2      3/4/2017

3      5/2/2015

4      6/7/2018
....

by using my specialized Calendar table:
Date            PostingDay
1/1/2018    False
1/2/2018    True
1/3/2018     True
1/4/2018    True

.....

 
I need to add either a column or measure to the master table which will count the days in the Calendar table between master.worked and today, but only where Calendar.PostingDay = TRUE. 

I have a relationship between the master table and calendar table joining Calendar.Date as a one-to-many with master.Worked. 

Still pretty new to DAX so I've muddled myself under CALCULATE, COUNTX, etc and I'm not sure how to get this info.

Any ideas?  Thanks in advance

[Ashish_Mathur]

Hi,

Could you share the exact expected layout and result.

[Greg_Deckler · Accepted solution]

I believe you want something along the lines of:

Measure = 
VAR __worked = MAX('Master'[Worked])
RETURN
COUNTX(FILTER(ALL('Calendar'),[PostingDay] = TRUE() && [Date]<=TODAY() && [Date]>=__worked),[Date])