1. Overview

This interaction calculates and sets the duration field when changes are made to the Start Date or `End Date fields.

2. Example

Below is an example of how it works:

It retrieves the values of the Start Date and End Date fields using a getValue() function.
It calculates the duration in milliseconds by subtracting the Start Date value from the End Date value. It then converts the duration from milliseconds to days by dividing it by (1000 60 60 * 24) to obtain the number of days between the two dates.
The possible scenarios are:

Scenarios	Actions
If the calculated duration is negative (which can happen if the `End Date` is before the `Start Date`).	It sets the duration to 0 to avoid negative values.
If the `Start Date` and `End Date` are the same.	It sets the duration to 1 day, ensuring that there's always a minimum duration of 1 day.
If both the `Start Date` and `End Date` values are available.	It sets the calculated duration (in days) into the `Duration` field using `setValue()` function.

startDate = May 2, 2023
endDate = May 3, 2023
duration = 1 days

async function handler(C) {
    let actions = [];

    let startDate = new Date(C.getValue("1662670-start-date")).getTime();
    let endDate = new Date(C.getValue("1662670-end-date")).getTime();

    let durationInMilliseconds = endDate - startDate;

    // Convert milliseconds to days
    let durationInDays = Math.ceil(durationInMilliseconds / (1000 * 60 * 60 * 24));

    if (durationInDays < 0) {
        durationInDays = 0;
    }

    // Set duration to 1 if startDate and endDate are the same
    if (startDate === endDate) {
        durationInDays = 1;
    }

    if (startDate && endDate) {
        actions.push(C.setValue("1662670-duration", durationInDays));
    }
    
    

    return C.mergeAll(actions);
}

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