How to Calculate Difference between two Dates in Java In Days If you are not running on Java 8, then there are two ways to calculate the difference between two dates in Java in days, either by using standard JDK classes e.
The function to do that is Date.
How will you get millisecond from a date in Java? Date class, as shown below: For instance, to obtain the number of days for a given number of milliseconds, we would divide by 86, the number of milliseconds in a day x 60 seconds x 60 minutes x 24 hours: The new classes are inspired by the highly successful Joda-Time framework, intended as its successor, similar in concept but re-architected.
This class knows about the weirdness we just talked about, e. It also supports setting the first day of the week to something other than Sunday. How to find the difference between two dates in Java? To a few examples now. By converting a date to milliseconds.
For example, attempting to assign a day of 30 to February causes the date to roll over into March: The desired interval can then be determined by dividing that number by the corresponding number of milliseconds.
For moving from a java. Finally, how about displaying a "new" image alongside new content that will automatically disappear the image, that is after the specified future date has been reached? You can calculate difference between two dates in joda by using static utility class Days, which has method daysBetween to return the number of days between two given dates as shown in the following example: Once you have milliseconds, you can just subtract them and then again divide them by milliseconds per day.
In fact it is loosely based on it. His function offers a lot of advantages over the simple one presented above. There is another class called, java. Unfortunately, this is a quite common requirement, as you may need to find days between today and your next birthday, or how many days to your next insurance premium from today, or simply how many days between last two cricket world cups.
For real world things, I would suggest to either use joda-time library if you are running on Java 6 or 7 or use new Java 8 date and time API if you are running on JDK 8. You can download joda-time Notice how the year for "Christmas" is dynamically set to the current year or nextyear if Christmas has already passed for this yearso the script is reusable now and in the future as well without having to modify it.
Duration, which is good to calculate a time difference between two instant. The key is to always go from the smallest interval - milliseconds - to the largest - days: The setDays setter, for instance, expects a day from 1 to There is a new Date and Time API which has corrected previous mistakes and turns out to be a real gem.
In order to solve this problem using joda-time, we need to use a class called LocalDate to represent your dates. Converting Milliseconds to other Intervals As long as you can calculate the number of milliseconds in an interval, you can come up with a number by dividing the total number of milliseconds by the number of milliseconds in the desired interval.
There is no reason for not using new Date and Time API if you are running in Java 8, and there is no way not to use joda-time for previous Java versions. Where to obtain the java.
Date to an Instantcall Date:: If you are using Maven then you can also add the following dependency into your pom. Alternatively, you can also use new java.
Call new conversion methods added to the old classes. Call the to…Part methods:Calculating the Difference between Two Known Dates Unfortunately, calculating a date interval such as days, weeks, or months between two known dates is not as easy because you can't just add Date.
If you are not running on Java 8, then there are two ways to calculate the difference between two dates in Java in days, either by using standard JDK classes e.g.
mint-body.com and mint-body.comar or by using the joda-time library. Unfortunately, Java's old Date and Calendar API is buggy and not intuitive, so many of us by default use Joda for all date and time arithmetic.
Whichever way you get there, the potential applications on date differences are many, from counting down to a particular event, counting up from a past date, to dynamically indicating what's new on your page. Calculating the difference between two Java date instances.
My code is as follows: var d1 = new Date(); //"now" var d2 = new Date(,3,17); //.Download