Calculate difference between two dates power query

[jshutters]

How do I calculate the difference between two dates in Power Query M code (not DAX)?  I'm looking for the number of days.

[Rakesh1705]

Source Data

Replacing null by 0 in sctotal and invvalue columns

Added new SCDate Column

Added new INVDate column

Added list of days or calendar column

Added final value per day column

Expanded the calendar and loaded it.

Use the calendar in slicer and final value column in card.

If your expectation is met the pls accept the solution.

[Rickmaurinus]

jshutters,

Good question. Your question depends on the following: 

1. Do you need the number of days between 2 dates?

Use Duration.Days ( [EndDate] - [StartDate] ) +1
2. Do you need the number of weekdays between 2 dates? 

 Generate a list of dates between start and enddate, and remove the weekends. Count the number of days left in your list.

3. Do you need working days between 2 dates? 

Generate a list of dates between start and enddate, remove weekends and holidays. Then count the number of days left in your list.  

For 2 and 3 I'll just drop this blog here so you can read the details. It's a bit more complex but replicates the DATEDIFF function for the M language: 

https://gorilla.bi/power-query/working-days-between-dates/

Cheers!

Rick

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[J2008F]

Hello 

How do I calculate the years between 2 dates on power query M coding?

 Date formate is e.g. 2022-12-10

[jshutters]

J2008F, to calculate the years between 2 dates, you can use the Date.Year function in M coding.  For example, Date.Year(<insert name of column2>) - Date.Year(<insert name of column1>)

[raymondwkmok]

A further queston on Duration.Days, the formula Duration.Days([Date1] - [Date2]) did not cater both date inclusive situation. Is there any way to modify the formula for both date inclusve situation? 

Example, The Duration.Days formula gives 6 for days between 2022/02/22 and 2022/02/28, but it should be 7 if both date inclusive.

[storgall]

Just add one day to the first date: Duration.Days(Date.AddDays([Date1],1) - [Date2])

Or just add one to the result: Duration.Days([Date1] - [Date2])+1

[rfratto]

One note: I kept receiving errors on the [Date1] - [Date2] until I explicitly converted my date values to a date using Date.From(): e.g. (for an aging calculation)  

= Duration.Days(Date.From(DateTime.LocalNow()) - Date.From([Due_Date]))

[dmatliak]

Hello is it possible to calculate number of days using date that I specify. I need to calculate number of day between August 31, 2021 and some Due date I have in data. When I use this formula Duration.Days(Date.From(2021-08-31) - Date.From([DEB_DAT])), it returns strange result.

Thanks for help

[jbocachica]

Hi, you can find the solution in this post.

http://blog.iwco.co/2018/12/07/numero-de-dias-entre-dos-fechas-power-query-m/

Regards

[LivioLanzo · Accepted solution]

Hi @jshutters

you need to use the duration functions: https://docs.microsoft.com/en-us/powerquery-m/duration-days

=each Duration.Days([Date1] - [Date2])

[jacekcholewa]

In similar cases is better to use DAX or PowerQuery to this calculations?

Can anyone write advantages and disadventages this two ways of solving similar cases?