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I warmly greet you all.
I am currently working on a booking application and as part of enhancing validation for date i would wish to limit the user from picking a date older than today.
I also wish to have a similar case but for picking the date of birth where by someone should not be able to pick future dates.
If anyone knows how i can achieve those two validation techniques using a date picker in phpmaker 12 or 2017, please come to my rescue.
Thank you so much

You can control the available years by setup the range in settings of JSCalendar in Client Scripts.

For example:
$(document).on("calendar", function(e, args) {
args.settings.range = [2017,2018]; // only 2017 and 2018 avaliable
});