javascript - How to validate date within a bound using java script -

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i have input field follows:

<input type="date" id="datepicker">

now want validate field such user can't select date after system's date , can't select date before date specified.

for example, if today's date is, 01-oct-2015, user can't select date after 01-oct-2015 , he/she can't select date before, let's say, 02-jan-2013.

how using javascript?


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