How To: Calculate the number of days between two Date fields on a form

Sintel Forms allows setting fields values based on formulas which are executed dynamically on a form while changing other field values (refer to calculated fields).

One of the interesting use cases is calculating the number of days between 2 dates.

In our demo list we created three columns:

  1. StartDate: type Date and Time
  2. EndDate: type Date and Time
  3. DaysBetween: type Number

The next step is to open the Sintel Forms Designer and place the new fields on a from.

The last step is to define a calculation formula for the DaysBetween field which requires following steps:

  1. Select the field in the Sintel Forms Designer
  2. In the “Properties” box enable “Has calculated value” setting
  3. In the Formula field insert the following code:
moment(getValue("EndDate")).diff(moment(getValue("StartDate")), "days")

Please note that Sintel Forms allows using the momentjs library in formulas.

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