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How can i get the month in string on a date 20 days ago from now

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Posted on by sacheu

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Hi,

I am trying to get the month in string on a date 20 days ago from now

Here is the expression I tried in my flow:

addDays( formatDateTime(utcNow(), 'dd-mm-yyyy'), -20)

But I get an error saying

In function 'addDays', the value provided for date time string '15-28-2020' was not valid. The datetime string must match ISO 8601 format.'.

Can you please tell me if there is another way to do this?

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RobElliott 10,418 Super User 2026 Season 1 on at

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Hi @sacheu in Power Automate months are always in upper case MM. Lower case is for minutes. One way to get just the month is to use a Convert time zone action:

The output of MM will be 12, MMM will give you Dec and MMMM December and you can use the Converted Time output in follow-on actions.

Rob
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v-alzhan-msft Microsoft Employee on at

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Hi @sacheu ,

You could take a try with expression below to achieve the requirement:

formatDateTime(addDays(utcNow(),-20),'MM')

Please let me know if your problem could be solved.

Best regards,

Alice

Community Support Team _ Alice Zhang
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

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