Hello Karen, its been a while hope you are well!
Here is some example code I have used before. Do you want the validation to happen on submit or as the user is inputting the data? My code below is based on an onChange of the Work End date on a task, but you could change it to an onSubmit can calculate and warn then.
Create a onChange client script for the End date:
function onChange(control, oldValue, newValue, isLoading, isTemplate) {
if (isLoading || newValue == '') {
return;
}
var starts = g_form.getValue('work_start');
startMillis = getDateFromFormat(starts, g_user_date_time_format);
var ends = newValue;
endMillis = getDateFromFormat(ends, g_user_date_time_format);
var minutes = (endMillis - startMillis) / (1000 * 60);
if(minutes > 480) {
alert('An Activity may only last 8 hours. You must enter multiple activities if the time required exceeds 8 hours.');
g_form.setValue('work_end', '');
}
}
Obviously you will need to calculate the a year to then compare for your alert. Thinking out loud an onSubmit may be better because you can prevent the save if it exceeds a year.
