Days between two dates in different rows

[mtrevisiol]

Hi everyone,

I've got a table that contains the price list of some products that my company buys from a certain supplier:

For each item there are the start date and the end date of the price shown in the line (31/12/2099 means the the price is currently valid).

My goal is to find out if there are any gaps between dates, so I need to calculate, for each item, the difference between the ValidityEndingDate and the next ValidityStartingDate:

Here is the PBIX file: https://www.dropbox.com/s/3q2rldzekcbjsh3/Days%20between%20dates.pbix?dl=0

I hope it's all clear. Thank you.

[HotChilli · Accepted solution]

A calculated column in DAX:

ColumnZ = var _item = 'Table'[Item]
var _endDate = 'Table'[ValidityEndingDate]
RETURN
CALCULATE(MIN('Table'[ValidityStartingDate]), FILTER('Table', 'Table'[Item] = _item && 'Table'[ValidityStartingDate] > _endDate))

You can then use DATEDIFF in another column to get the days between the column and the ending date.

I haven't really tested it so please do that.

[mtrevisiol]

That's great @HotChilli ! I've created this column:

Days between pricelists =

var _item = 'Table'[Item]

var _endDate = 'Table'[ValidityEndingDate]

var _next_date = CALCULATE(MIN('Table'[ValidityStartingDate]), FILTER('Table', 'Table'[Item] = _item && 'Table'[ValidityStartingDate] >= _endDate))

RETURN DATEDIFF('Table'[ValidityEndingDate], _next_date, DAY)