Unable to process template language expressions in 'formatDateTime'

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Posted on by oaghaei

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I am getting the following message when I attempt to reformat my date and time field.

"Unable to process template language expressions in action 'Formatted_Deadline' inputs at line '1' and column '25790': 'In function 'formatDateTime', the value provided for date time string 'Applicationdeadline' was not valid. The datetime string must match ISO 8601 format.'."

Here is what the date looks like:

I used the following expression in the compose (formatted deadline):

formatDateTime('Applicationdeadline','yyyy-MM-dd')

I thought I followed the steps from the following source, but maybe I missed something? 🤷‍♀️

https://support.microsoft.com/en-us/topic/how-to-customize-format-date-and-time-values-in-a-flow-34a91243-2961-d98c-c010-e385858b19cd

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Building flows

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Ellis Karim 11,691 Super User 2025 Season 2 on at

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The flow is failing at the expression because it is trying to convert the text Applicationdeadline to a date:

Specify the Compose 'variable' in the expression:

formatDateTime(outputs('Compose'),'yyyy-MM-dd')

Example output:

Ellis
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oaghaei 173 on at

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@ekarim2020 you are definitely a rockstar. Thank you! That worked. For some reason I thought i was supposed to put in my value there. At least that's how i understood the instructions in the link I shared above.
This worked!! Accepting the solution. Thank you again!

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