CODEWITHSUNDEEP
java
Mandar Mule
Mandar Mule

Reputation: 13

Not able to Subtract 1 day from New Year date using java(1-1-2100)

I just want to subtract 1 day from New year date in my current scenario. But while I subtract I get date: 31-0-2100.

Calendar cal = Calendar.getInstance();
cal.set(2100, 1, 1);
cal.add(Calendar.DATE, -1);
String dateStr = ""+cal.get(Calendar.DATE)+
    "-"+cal.get(Calendar.MONTH)+"-"+cal.get(Calendar.YEAR);
System.out.println(dateStr);

The actual date should be: 31-12-2099

Upvotes: 0

Views: 572

Answers (5)

Sireesh Yarlagadda
Sireesh Yarlagadda

Reputation: 13736

Implemented using Calendar functionality.

Tested and Executed

   Calendar cal = Calendar.getInstance();
   DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
   cal.set(2099, 00, 01);
   cal.add(Calendar.DATE, -1);
   System.out.println(dateFormat.format(cal.getTime()));

Another solution Formulate the DateTime using the below methods

date.getYear();
date.getDay();
date.getMonth();

Try to pass those arguments into the DateTime.

DateTime date = new DateTime(2100, 1, 1, 0, 0, 0);
date = date.minusDays(1);
System.out.println(date.toString("yyyy-MM-dd"));

Upvotes: 0

Alexis C.
Alexis C.

Reputation: 93872

When you're doing cal.set(2100, 1, 1);, the date you set is actually the first day of February and not January since months are 0 base indexed (0 -> January, ..., 11 -> December).

I would recommend you to use JodaTime which is a far better library to deal with dates and time.

DateTime date = new DateTime(2100, 1, 1, 0, 0, 0);
date = date.minusDays(1);
System.out.println(date.toString("dd-MM-yyyy")); //31-12-2099

Or if you're using , they introduced a brand-new date and time API:

LocalDate date = LocalDate.of(2100, Month.JANUARY, 1);
date = date.minusDays(1);
System.out.println(date.format(DateTimeFormatter.ofPattern("dd-MM-yyyy"))); //31-12-2099

Upvotes: 3

DWilches
DWilches

Reputation: 23035

Notice that the field MONTH is 0-indexed, so the month '1' is actually February and what you are getting: '31-0'2100' is the last day of January.

Source: http://docs.oracle.com/javase/7/docs/api/java/util/Calendar.html#MONTH

Field number for get and set indicating the month. This is a calendar-specific value. The first month of the year in the Gregorian and Julian calendars is JANUARY which is 0; the last depends on the number of months in a year.

Upvotes: 1

Zini
Zini

Reputation: 914

Use this instead:

call.add(Calendar.DAY_OF_MONTH, -1)

Upvotes: -1

OuSs
OuSs

Reputation: 444

In java the month 0 is January.

So what you got is correct since you're substracting 1 day from February 1st 2100

Upvotes: 1

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