Get exact age from datepicker?

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Hey @lisamthorpe

You also need to check the month and day, not just the year, @yisrael-wix already gave you the answer, but I’m going to explain it for you and for others.

const date = $w('#datePicker').value; // Get the value from the date picker

function getAge(date) {
    // A variable to see if the person age is above 18;
    let legalAge = false;

    // Variables for the age
    let age = { year: 0, month: 0, day: 0 };

    // Get today's date.
    const today = new Date();

    // Get the age of based on the birthday
    age.year = today.getFullYear() - date.getFullYear(); // Get the year difference
    age.month = today.getMonth() - date.getMonth(); // Get the month difference
    age.day = today.getDate() - date.getDate(); // Get the day difference
    
    if (age.month < 0) {
        /* If the current month is past the birthday month, then the person
           is one year younger, and we need decrease the year age.
        */
        age.year--;
    } else if (age.month === 0 && age.day < 0) {
        /* If the current month is the same as the given month, and the current
           day is before the person birthday day, and we need decrease the year age.
        */
        age.year--;
    }

    // Check if the year difference is in the legal age (greater or equal to 18)
    if (age.year >= 18) {    
        // Now check if the current month is after the birthday month or the same
        if (age.month >= 0) {
            // Now check if the current day is the same or after the birthday day
            if (age.day >= 0) {
                // The person is 18 years old or more.
                legalAge = true;
            }
        }
    }
    
    /*  prepare the data to return it - you don't need this part
        This part will return the age like this (19 Years, 5 Months and 7 Days)       
    */    
    let ageText = `${age.year} Years`;
    if (age.month > 0) {
        if (age.month === 1) {
            ageText = `${ageText}, 1 Month`;
        } else if (age.month > 1) {
            ageText = `${ageText}, ${age.month} Months`;
        }
    }
    
    if (age.day > 0) {
        if (age.day === 1) {
            ageText = `${ageText} and 1 Day`;
        } else if (age.day > 1) {
            ageText = `${ageText} and ${age.day} Days`;
        }
    }
    
    // Return the final results.
    return {
        legalAge: legalAge,
        age: {
            numeric: age.year,
            text: ageText
        }
    }
}

/*  Calling the function getAge() with the date picker as a parameter
    will return the following result - It'll differ by the date you select
*/    

/*
    Object {
        legalAge: true,
        age: {
            numeric: 26,
            text: "26 Years, 2 Months and 4 Days"
        }
    }
*/

Hope this helps~!
Ahmad