Problem with Subtract from Time (in months)

[scottgm]

Hello all, 

I am building a workflow where I need to add/remove x-number of days to either the beginning or end of current, previous and next month. I have this part nailed down and working as expected. The date calculations are based on 3 initial values using these calculations:

CurrentMonth =  (expecting May)

startOfMonth(utcNow())

PreviousMonth =  Expecting April --> Actual is March

subtractFromTime(outputs('CurrentMonth'),1,'Month')

NextMonth = (expecting June)

startOfMonth(addToTime(utcNow(),1,'Month'))

This all worked as expected a few days ago, but now when I test on 1st May. The value for PreviousMonth is returning March 31st. My best guess is that by subtracting 1 Month, it is actually subtracting 31 days? 

I could work around this by subtracting 4-weeks rather than 1-month but I'd like to know if I am missing anything here or if someone has seen a similar issue?

Thanks,

Scott 

[v-zhos-msft · Accepted solution]

Hi @scottgm ,

I have made some tests on my side.

It has the same issue as yours.

As you said, the cause is subtracting 1 Month, it is actually subtracting 31 days.

I suggest you  subtract 4-weeks here, or use the getPastTime function for a try.

https://docs.microsoft.com/en-us/azure/logic-apps/workflow-definition-language-functions-reference#g...

Best Regards,

Community Support Team _ Zhongys

If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.