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Helper V
Helper V

Creating Planner Tasks from Excel - error date format


i created a flow that creates a planner tasks from a list of rows in excel.

when using UTCNOW and ADDDAYS as parameters it woked fine, but when im trying to get the date as input form the excekl im getting an eror.

below some screenshots to assist:

1. the excel date:


2. flow - create a task


3. error message

"The request is invalid:\r\nCannot convert the literal '43662' to the expected type 'Edm.DateTimeOffset'.",
"innerError": {
"request-id": "1fa2c77f-93f7-493d-b9c6-c6f833f52add",
"date": "2019-06-26T15:27:17"
thanks a lot

Accepted Solutions
Helper V
Helper V

 i found another workaround that work for me, i put as a start date UTCNOW and in my excel im giving numeric intervals per task from day 1.


thanks a lot for your repsonses

View solution in original post


Hi @Perez 


This is an issue with the excel connector and the date type data format on the excel column. I would suggest you to first convert the datatype of your excel column to type text and then run this flow (use the fomrat date time function to format the string to date and time)


Hope this Helps!

If this reply has answered your question or solved your issue, please mark this question as answered. Answered questions helps users in the future who may have the same issue or question quickly find a resolution via search. If you liked my response, please consider giving it a thumbs up. THANKS!

Hi @yashag2255 ,

thanks for your fast reply.

i tried to implement, it didnt worked, i think i didnt got the formatDateTimefunction correctly.

i tried: formatDateTime(item()['Due Date'],'dd/MM/yyyy')

is this correct? if not can you help with putting the correct expression


the error i got:

InvalidTemplate. Unable to process template language expressions in action 'Create_a_task' inputs at line '1' and column '1980': 'In function 'formatDateTime', the value provided for date time string '43662' was not valid. The datetime string must match ISO 8601 format.'.




Hi @Perez 


The expression is correct but the date format that you are getting from Excel is not. Were you able to change the column data type to text in excel?

Hi @Perez ,


It is a known issue that Date and time returned from the Excel Online table will be converted to a string but not a date.


You need to use a function to format it to a valid date and time.


Please check the following flow for a reference.


Compose is used to get the actual return value of the Start date.


In Compose2, input the following code to get the exact date:




Best regards,



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

 i found another workaround that work for me, i put as a start date UTCNOW and in my excel im giving numeric intervals per task from day 1.


thanks a lot for your repsonses

Regular Visitor


I have exactly the same problem described above and until now I've understood I have to use the expression

addDays('1900-01-01',int(items('_')?['Date'])) ...

However I have only very basic knowledge of Flow and can't figure out how to make the expression work...

Can anyone tell me exactly what to do? 😞



Hi I've got this same issue. I was able to add in your expressions with the Compose 1 and Compose 2 to get the right date.  However I'm stuck as to what to do after that?  How do you get the correct date in the "Create a Task" operation?  I inserted your Compose operations just above my already existing "Create a Task" operations and still got the same error.  Thanks,

@Miel  the solution as proposed by msftis working fine, you should use the formulas as described in his response, than just use the second compose output as your new date value



On the above thread, I am successful at doing the date conversion, but like @Miel I am not able to find where the output is after the date has been converted.


Can you assist in assigning the date value to another field later in the flow?


Thank you in advance!

-- Matt

Regular Visitor

Please use Convert TimeZone and select RoundTrip pattern, this should solve of converting to format required by "Create Task"





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