Get Date based on day count in Java

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Simple Question, but Google surprisingly had little on this. I have the number of days from Jan 1st of the year. How can I convert that to a date in Java?

Use Calendar for date arithmetic

    Calendar c = Calendar.getInstance();
    c.set(Calendar.YEAR, 2013);
    c.set(Calendar.MONTH, Calendar.JANUARY);
    c.set(Calendar.DATE, 1);
    c.set(Calendar.HOUR, 0);
    c.set(Calendar.MINUTE, 0);
    c.set(Calendar.SECOND, 0);
    c.set(Calendar.MILLISECOND, 0);
    c.add(Calendar.DATE, numberOfDays);
    Date date = c.getTime();

Note that the result may be different for different locales because of DST (summer time). The above example uses default locale.

Java, We have already seen How to find the number of Days between two dates prior to Java 8. In this tutorial we will see how to calculate the number of days. The date (it will be the actual date of the month). The day (the day at the given date – like Sun, Mon, Tue, etc.) Concerning computer systems, there are quite a lot of parameters that can be used to associate with a date. We shall see them in the later parts of this topic. Display Date in Java. Now let us see how Java provide us the Date.

You can simply use SimpleDateFormat to convert String to Date. The pattern D can be used to represent the day number of year.

Provided that you've an

int numberOfDays = 42; // Arbitrary number.

then this one counts the number of days since 1 Jan 1970 (the Epoch)

Date date = new SimpleDateFormat("D").parse(String.valueOf(numberOfDays));

alternatively, this one counts the number of days since 1 Jan of current year.

Date date = new SimpleDateFormat("D yyyy").parse(numberOfDays + " " + Calendar.getInstance().get(Calendar.YEAR));

Java 8 - Calculate days between two dates, Get day, month, year value from the current date: 54. public class Program. assigns the value 11 to the variable month, based on the value of the Date object Xmas95. Java program to calculate age from date of birth using Java 8 localdate,  Add One day to a Date in Java 4. Add One day to the current date in Java 5. Java 8 – Adding 1 day or number of days to the current or given date. 1. Adding Days to the given Date using Calendar class. In this example we have given a date “2017-01-29” and we are adding the days to it using Calendar class.

I find JodaTime very elegant to use when it comes to date handling. With it, you could do it like this:

DateTime date = new DateTime().withDayOfYear(dayOfYear);

Java get number of days in current month, and time; then use the getTime method to convert this to a java. If the dayOfWeek is FRIDAY then 2 days are added to the localDate to get the date for the nearest MONDAY. 2 days are added using LocalDate.plusDays() method, and assigned to the LocalDate instance named firstWorkingDay. If dayOfWeek is SATURDAY then a single day is added using plusDays(1) and assigned to firstWorkingDay.

Java Date/Calendar example: How to get today's date (now , How do you check if a date is between two dates in Java? We can get the dates between two dates with single method call using the dedicated datesUntil method of a LocalDate class. The datesUntill returns the sequentially ordered Stream of dates starting from the date object whose method is called to the date given as method argument.

If you are Android developer and using JodaTime this is how you get equivalent of this in java 8.

LocalDate.ofYearDay("2020", 255).getDayOfWeek().getValue()

Use this because ofYearDay is only supported above Android >= 26;

MutableDateTime mutableDateTime1 = new MutableDateTime();
mutableDateTime1.setYear("2020");
mutableDateTime1.setDayOfYear(255);
LocalDate.fromDateFields(mutableDateTime1.toDate()).getDayOfWeek();

Android calculate days between two dates, How do I count the number of days between two dates in Android? In your code, month is one-based. That's surprising. You can of course decide to deviate from common practice, for various reasons. Common practice isn't always best practice. As a newcomer it's difficult to judge when common practice is better than your approach and when your approach is better than common practice.

Difference Between Two Dates in Java, Learn how to calculate the difference between dates in Java, using native approach, as well as external Date to Find the Difference in Days. The getTime () method returns the number of milliseconds since January 1, 1970: The getFullYear () method returns the year of a date as a four digit number: The getMonth () method returns the month of a date as a number (0-11): In JavaScript, the first month (January) is month number 0, so December returns month number 11.

Find number of days between two given dates, Let this count be n1. Every leap year adds one extra day (29 Feb) to total days. n1 = 2000*365 + 31 + 1 + Number of leap years Count of leap years for a date  Although the Date class is intended to reflect coordinated universal time (UTC), it may not do so exactly, depending on the host environment of the Java Virtual Machine. Nearly all modern operating systems assume that 1 day = 24 × 60 × 60 = 86400 seconds in all cases. In UTC, however, about once every year or two there is an extra

Find day of the week for a given date, A typical application is to calculate the day of the week on which someone was PHP | Converting string to Date and DateTime · Java | Current date and time  It is 7777 days from the start date to the end date, but not including the end date. Or 21 years, 3 months, 15 days excluding the end date. Or 255 months, 15 days excluding the end date.

Comments
  • FYI, the terribly troublesome old date-time classes such as java.util.Date, java.util.Calendar, and java.text.SimpleDateFormat are now legacy, supplanted by the java.time classes built into Java 8 and later. See Tutorial by Oracle.
  • I like this one. Is there a way I can add the number of minutes since mid-night in there too?
  • FYI, the Joda-Time project is now in maintenance mode, with the team advising migration to the java.time classes. Much of the java.time functionality is back-ported to Java 6 & Java 7 in the ThreeTen-Backport project. Further adapted for earlier Android in the ThreeTenABP project. See How to use ThreeTenABP….
  • FYI, the terribly flawed date-time classes such as java.util.Date, java.util.Calendar, and java.text.SimpleDateFormat are now legacy, supplanted by the java.time classes built into Java 8 and later. Suggesting their use in 2020 is poor advice.
  • Why on Earth? SimpleDateFormat is notoriously troublesome and GregorianCalendar poorly designed too. Both are long outdated. Who needs an answer using those classes in 2020? Nobody in the world IMHO.
  • While this code snippet may solve the question, including an explanation really helps to improve the quality of your post. Remember that you are answering the question for readers in the future, and those people might not know the reasons for your code suggestion.