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How to make unavailable to click some dates in qooxdoo date widget?

Is it possible to make specific dates or a range of dates in qx.ui.form.DateField widget unavailable to click/interact with somehow?

This functionality was added by me to qooxdoo version 7.2.1. You can set minimal and maximal dates via special properties like MinValue and MaxValue.

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.

Date Range functionality for Datebox

I am using Datebox widget and want to limit the dates from which the user can choose.
eg. Only dates between 2013-Jan-02 and 2013-Jan-25 should be enabled, rest disabled.
How do I provide these values programatically ? Passing it in JSON is not working for me.
$('#dateInput').datebox({"mode": "calbox", 'min':"2013-01-02", 'max':"2013-01-25"});
Please let me know the syntax to pass the date range parameters.

I dont know whether it is possible in Datebox widget. But if you pick Jquery UI datepicker, it has this option.
Have a look at this if you are interested
http://jqueryui.com/datepicker/#min-max

jQuery datePicker endDate

I'm using this particular datepicker script (which is not the one provided in jQuery itself, but they happen to have the sane name)
datePicker
And in the examples there's an option to only select dates in the past selectables, however, i can't figure out how to set selectables dates in the past INCLUDING today, without trying to fool the datePicker that the end date is tomorrow (which causes the calendar to render tomorrow selectable, but at select it does nothing)
After lot of testing however i've come into some light about the problem, it seems that when you pass the endDate to the script it transform it to string to later again transform it to a Date object, when doing this the script seems to ignore the hour and it simple puts 00:00:00:00 but when checking the max selectable date it gets 12:00:00:00, since the date i'm givin is greater than today it becomes not selectable.
Thanks in advance
PD: Suggestions like "use another calendar then" means too many changes, so i'd rather try to fix the current one.

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.