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Is there any way to fill the empty week days cells(previous and next months) in mat-datepicker and mat-calendar

I'm setting a calendar to Help users to select dates, but i want to fill the empty cells at the start of the first week with the previous and next months
I'm using the Datepicker from Angular Material.
hrer is a picture link explains more :
https://i.imgur.com/cCDSBsH.png

According to their API, you can't.
You need to create your own custom calendar.

How do I facilitate easy year-to-year navigation using react-datepicker?

I was thinking of having some double arrows that allow year scrolling similar to the month scrolling ones. Other ideas on how to reach the main goals are more than welcome.
GitHub link:
https://github.com/Hacker0x01/react-datepicker

You can look this example. You need to pass showMonthDropdown and showYearDropdown for the DatePicker to display select dropdowns for year and month.

do you want something like this.
just add this code to your react calendar :
dateFormatCalendar="YYYY"

Full calendar extend cells

these days I am using full calendar and I am trying to add multiple events in one cell, but when I add more than one, it shows just +2 , I want to remove that and instead of the +2 it should extend the cell , in the photo you can see how it looks like for the momententer image description here

This is controlled by what you specify in the "eventLimit" option:
eventLimit: false
will stop it putting the +1, +2 etc type of text onto the calendar. If you want to move the limit to a higher number of events, to stop your calendar being too crowded on odd days where there is an unusual number, you can set it something like:
eventLimit: 10
however you please.
See https://fullcalendar.io/docs/display/eventLimit - there are other ways to use this option too - you can read all of this kind of thing for yourself in the fullCalendar documentation.

How to add a external element date block of 3 days with drag n' drop with fullcalender

I am using the http://arshaw.com/fullcalendar/ to create a simple calender with a drag and drop functionality, and I was hoping if anyone who has had experience using it can helping me out a bit with a question I'm having.
What I am trying to achieve is to create a draggable block that highlights a set of days instead of one day in the calender. My approch to solving this was to take the day I drop the block and count the next 3 days and set that as my end date.
//create 3 day block
var threeDayBlock= date;
threeDayBlock.setDate(threeDayBlock.getDate() + 2);
Then add it to the calender as follows
copiedEventObject.end = threeDayBlock;
What this does however is, once I drop it to a selected date it moves the event 3 days ahead instead. What I would like it to do instead is enter a three day block from the day I drop it to 3 days ahead.
Here is my code in jsfiddle http://jsfiddle.net/rayshinn/ZTWgD/3/
I really appreciate any help I can get to solving this matter! Thank you for reading.

What's happening is that you're creating a reference called threeDayBlock to the object date. Therefore, when you change threeDayBlock, you're changing date as well. All you need to do is copy the date object instead of referencing it:
var threeDayBlock = new Date(date.getTime());
That's it!
See it working here: http://jsfiddle.net/ryleyb/ZTWgD/4/
Also, to understand how Javascript deals with values being copied vs referenced, see here.

A bar that takes date input by range and also let us write tags in it.

I am making a responsive time sheet. i want to take input by date ranges so that if user selects date 1-july on one end and 10 july on other end, i must get 2 dates and it must be able to take input about the work.
for example i selected 1-july on one end and 10 july on other end. and in that span, i want to put a tag that this task was done in this time span.
like this:
http://jqueryui.com/resources/demos/slider/range.html
instead of price range, i want date ranges and i must be able to define tags inside it.
any ideas of how to do this in html5, jquery or javasript ?

I believe this is your answer...enjoy!
http://ghusse.github.io/jQRangeSlider/documentation.html#dateSliderQuickStart