Find out which date it will be in a certain number of days, or which date it was a certain number of days ago. Find out the weekday of a certain date. What day of the week was it when you were born?
Was your wedding really on a Saturday? Which weekday did the French Revolution take place? Find it all out in this calendar calculation. Calculate how many days there are between two given dates, for example today and Christmas Day. Calculate when your family turns days. Do you want to have a reason to celebrate something with your family? Here you can calculate when your family turns days, years and similar things worth celebrating.
Calculate one time dimension to another. This calculation helps you find out how much, for instance, days is in matter of months, weeks, hours and so on. Calculate dog age in human years and vice versa. Embed Share via. Table of contents: How to use the days calculator How many days between dates? How to use the days calculator There are three main ways you can use this date to date calculator: Unknown number of days between dates.
How many days between dates? You can ask yourself two questions: On what date will the progress check take place?
How many days do you have before the progress check? Not sure whether the result is correct? Go ahead and check it with the date duration calculator! Bogna Szyk and Rita Rain. Time between. Advanced mode. Here is a quick and dirty implementation of datediff , as a proof of concept to solve the problem as presented in the question.
It relies on the fact that you can get the elapsed milliseconds between two dates by subtracting them, which coerces them into their primitive number value milliseconds since the start of You should be aware that the "normal" Date APIs without "UTC" in the name operate in the local timezone of the user's browser, so in general you could run into issues if your user is in a timezone that you don't expect, and your code will have to deal with Daylight Saving Time transitions.
You should carefully read the documentation for the Date object and its methods, and for anything more complicated, strongly consider using a library that offers more safe and powerful APIs for date manipulation. Also, for illustration purposes, the snippet uses named access on the window object for brevity, but in production you should use standardized APIs like getElementById , or more likely, some UI framework. As of this writing, only one of the other answers correctly handles DST daylight saving time transitions.
Here are the results on a system located in California:. Although Math. Instead, by explicitly accounting for changes to the UTC offset when DST begins or ends, we can use exact arithmetic:. JavaScript date calculations are tricky because Date objects store times internally in UTC, not local time.
On this day, midnight to midnight local time is only 23 hours in UTC! Although a day in local time can have more or less than 24 hours, a day in UTC is always exactly 24 hours. You get the difference days or NaN if one or both could not be parsed. I recommend using the moment.
It handles daylight savings time correctly and in general is great to work with. I know this is not part of your questions but in general, I would not recommend doing any date calculation or manipulation in vanilla JavaScript and rather use a library like date-fns , Luxon or moment. I would go ahead and grab this small utility and in it you will find functions to this for you.
Here's a short example:. To Calculate days between 2 given dates you can use the following code. Dates I use here are Jan 01 and Dec 31 It is possible to calculate a full proof days difference between two dates resting across different TZs using the following formula:. I found this question when I want do some calculate on two date, but the date have hours and minutes value, I modified michael-liu 's answer to fit my requirement, and it passed my test.
This may not be the most elegant solution, but it seems to answer the question with a relatively simple bit of code, I think. Can't you use something like this:. What about using formatDate from DatePicker widget? If you have two unix timestamps, you can use this function made a little more verbose for the sake of clarity :.
The date. I had the same issue in Angular. I do the copy because else he will overwrite the first date. Both dates must have time obviously.
I used below code to experiment the posting date functionality for a news post. I calculate the minute or hour or day or year based on the posting date and current date. The simple way to calculate days between two dates is to remove both of their time component i. I took some inspiration from other answers and made the inputs have automatic sanitation.
Count holidays. Check or define holidays below. New Year's Day. King Day US. President's Day US. Memorial Day US. Independence Day US. Labor Day US. Columbus Day US. Veteran's Day US. Thanksgiving US. Black Friday US.
Christmas Eve. New Year's Eve.
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