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Typing the date time in textbox, does not change the selected value of date picker

I've used use babakhani Persian datepicker in my project.
There is a problem here. the selected value of date picker does not change on textbox value change!! How can I fix it in my project, myself?
JsFiddle
I used
$("#example1").change(
function (e) {
$("#example1").pDatepicker();
};
});
but the error is:
too much recursion
since it calls change() recursively. (also .blur() is tested)

No need to use change event. you can directly use
$(document).ready(function () {
$("#example1").pDatepicker();
});
Also there is an additional } in your code.

Update bootstrap datetimepicker after every step/click

I'm using this extension of Bootstrap's datepicker. It works well enough, but I've come upon a usability issue - when selecting a date/time, the text field the datepicker is attached to does not update unless all the steps (year/month/day/hour/minute) are selected to the end. Clicking away from the datepicker before clicking all the steps yields no change to the date in the text field.
How do I make it so that when the user clicks away mid-selection (maybe because they just want to change the date, but find the already-present hour and minute to be acceptable), the text field is updated appropriately?
For example:
Initial date in field: 2015/10/10 10:00
Click on 2015/10/15 -> click away -> date in field: 2015/10/15 10:00
Is that even possible?

Check this updated fiddle - https://jsfiddle.net/4cqLcxcm/8/
Added on changeDay event on datepicker, which will trigger on change of date and set that value into input box.
Below is the code I have changed.
$(document).ready(function() {
var now = new Date();
$('#send-time').datetimepicker({
format: 'yyyy/mm/dd hh:ii',
startDate: now
})
.on('changeDay', function(ev){
$('#send-time').datetimepicker('update',ev.date);
});
console.log('test');
});

How can I get the new value of an HTML input after a click event has modified it?

I have the following..
# Html.EditorFor ( model = > model.Date )
A template editor also works in the DateTime type
Clicking on this entry, a calendar is displayed , you select a calendar date , and that date
is the new value of my post. What I need is to validate that the date you select is equal or greater than today.
I tried the onchange event for the EditorFor , but it did not work , Jquery DatePicker property has a MinDate
but added that would mean modifying the operation of all entries with the DateTime data type .

jQuery Datepicker has onSelect function which will give you the chosen date that is displayed in date input box! Here is a fiddle http://jsfiddle.net/aa74R/66/
onSelect: function(dateText, inst) {
var date = $(this).datepicker('getDate');
alert(date);
}

The Question is a bit vague, however I think this should help.
It looks like what you want to do is change the date, based on after you've selected a newDate. onChange should work. As far as why it isn't, it could be a matter of code.
If it's a matter of how you've written your code:
$('#inputId').on('change', function(){
var newDate = $(this).val();
});
I personally think this might be an easier approach for some, however inefficient as it persistently sets the date every time you leave the field:
$('#inputId').on('blur', function(){
var newDate = $(this).val();
});
There are also many other ways to write it. But I feel like this might have the proper level for you.

Question doesn't seem to have a context with the absence of code.
Since you have tagged jQuery a possible problem might be you are binding the onchange event to the textbox. If this textbox were to be dynamically generated, the onchange event would never be registered. If this is your problem then you could do this-
$("body").on("change", "#textBoxId", function(){
alert($(this).val());
});

Time changes automatic in the input box while I open datetime picker

I am using jquery date-time picker in input box.
initialized with below code
minDate: 0/new Date(); (tried both)
Input box has some old date-time when I click for edit it open date-time picker, it disable old date and old time but it also change time in input box to current time if input box time is earlier than current time.
You can see here live example
http://jsfiddle.net/bhupendra21589/perd7pc6/

use
var d = new Date()
$( '#duedate' ).datetimepicker({
minDate: '0',
minTime:d.getHours()+":"+d.getMinutes(),
formatTime:'H:i'
});
I hope this solves the issue
jsfiddle link : http://jsfiddle.net/adityashankert/perd7pc6/17/

Setting default time value for datetime-local

I am using this html tag as a datetime picker:
<input type="datetime-local">
I want to be able to set a default value for the time part only so if
someone inserts a date and doesn't insert the time (leaves it as --:--:--) then I will be able to set it as 00:00:00 for example.
The problem is I know only how to set the a value including both the date and time and if someone inserts only a date w/o the time I can't read that value and getting a blank value.
Is it possible to overcome that? or is there any other datetime picker I could use for the described scenario?

We can not change the behavior of browser against an element. So this is an answer to the second question that if there is another solution for this scenario. I used two separate fields of date and time which control a single datetime-local field.
Please note that the date filed has no value unless the field is totally completed. So I used blur event instead of keyup or change.
$(document).ready(function() {
var mydate, mytime, mystring;
$("#dateField").blur(function() {
if ($(this).val()) {
setResult();
}
})
$("#timeField").change(function() {
setResult()
})
})
function setResult() {
mydate = $("#dateField").val();
mytime = $("#timeField").val();
mystring = mydate + 'T' + mytime;
document.getElementById('resultField').value = mystring;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input id="dateField" type="date"><input id="timeField" type="time" value="18:30">
<br>
<strong>Result</strong>:
<br>
<input id="resultField" type="datetime-local">
Footnote 1:
The change listener works on time field (when has default value) but I noticed a vague behavior in google-chrome that if you change the value of time filed by mouse clicks, the change event is triggered after mouseOut! This has no effect on the answer above.
Footnote 2:
You can hide the result field inside a display:none div.