Error when calculating the number of days between 2 dates

[Kal_Lam]

Welcome back to the community, @Patricio_Andres84! Have you tried this approach discussed previously:

Calculate number of days between 2 dates

@luswetiopicho, you could have a look at the sample shared below, the exact copy of what @Xiphware has outlined above: In the survey tab of your XLSForm: [Image 1] Data entry screen as seen in Enketo: [Image 2] Reference XLSForm: Calculate Days.xlsx (10.3 KB)