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Disable dates using jQuery Datepicker

I understand that we can disable certain dates (Jquery UI datepicker. Disable array of Dates) by manually specifying each date in array however this seems like a messy solution to a problem.
Is there a simpler method of just providing a start and end date of a period in which dates should be disabled? i.e. 07/07/2020 to 07/08/2020 rather than specifying each date between these?

How can I disable only selected dates on html5 datepicker?

How can I disable few dates (Ex: one week) on a HTML datepicker? I have an input item like this
<input type="date" id="date01" name="date01" max="2019-12-30">
I know I can use min and max values to limit available time period, but in here, I want to block out some days in the middle. can I do that with plain html date picker? if so, how?

You can't: the HTML5 date input only accepts a lower and upper bound to indicate the allowed date range: you cannot specifically select certain dates that are disabled/non-selectable to the user.
There are two solutions to your approach:
Use a combination of client- and server-side validation to let the user know that certain dates are not allowed. This comes at the cost that the user does not know which dates are not allowed when the native date picker is shown in the browser.
Alternatively, you can use a third-party library that allows disabling of specific dates.

From html input="date" to html select drop down format

Is it possible to convert html tag/format <input type="date"> to html tag/format <select><option></option></select> ?
I just wanted to make an input type date to a select drop down format.
For example:
From
Date of Birth - input type date
To
Date of Birth - select drop down option
Actually, I don't want to separate the date of birth values into three. But instead, make a better solution wherein I can transform the input date into a select drop down one.
Anyone who can help me with this one? Thank you.

You may use jQuery plugin to showcase a datepicker like the one below:
https://plugins.jquery.com/datetimepicker/
You can easily find many other jQuery plugins for the same.
If you wish to play around with its UI, you may use jQuery UI built-in themes or write some CSS on your own.

Depending on the browser to open dialog. and also input type=date not support in every browser.

jQuery DatePicker & DateTimePicker

I have faced a little problem while trying to use this two jquery plugins. Hope someone can help me out with this.
The first plugin (DatePicker) I have used is the default one that comes with the jqueryui.
The second plugin (DateTimePicker) is the DateTimePicker from http://trentrichardson.com/examples/timepicker/
What I am trying to achieve is to have a user-defined date range like the sample provided in the jqueryui, with two textboxes (specify start date and end date) http://jqueryui.com/demos/datepicker/date-range.html
While having another datetimepicker to allow user to select a datetime within the date specified above.
Here's a sample: http://jsfiddle.net/uyB52/1/
However, the issue here is that whenever I try to add in the datetimepicker javascript, the datepicker will not function properly. It will not be able to set the minimum date range as what it is suppose to be.
Have anyone encountered the same issue before? Can some one please advice me? I am still new to programming. Thanks in advance!

It looks like your datetimepicker plugin interferes with jQuery UI (although it is supposed to be a working jQuery UI plugin). There may are possibilities to fix this issue, but I would recommend to use no or another plugin for picking the time (which works).
If you want to use a datetimepicker, you will have to search for different plugins and find out which one fits your needs best. I can not really recommend a plugin because it depends on your requirements.
But you could also go without a datetimepicker plugin and only use jQuery UI instead? Have a look at this fiddle: http://jsfiddle.net/uyB52/7/
The idea is to use jQuery UI's datepicker for picking dates, and use dropdown boxes for choosing the time. You could also let the user input the time in an input field and validate it. Or, instead of dropdown boxes, use the jQuery UI slider.

Got it. You should convert string into Date as minDate and maxDate options take Date object.
$("#from").datepicker("option", "maxDate", new Date(selected_date))
jsfiddle

javascript form validation for date & Time

I am writing a javascript to validate Date&time based on the two Dropdowns selected
Based on the dropdown change the validation has to be changed on Date&Time field
I am looking for the validation popup some thing like:
Entered Date&Time should be on or before 1 AM (Midnight) same day

I'm sure that a framework would help immensely (and I'm sure you'll get lot of suggestions to move to one) but if you're just looking for better Date handling you might want to look at my DP_DateExtensions component.
It'll allow you to very simply parse dates (create date objects from your drop-down field values using the Date.parseFormat() method) and then do date math and comparisons on them (in your case using date.compare() to compare the entered date to your target date).
You can then use the timeFormat() and dateFormat() methods to display date/times exactly as you want.
The component's old... but well seasoned and, at least to me, insanely useful.