Panayappan Swaminathan Panayappan Swaminathan - 1 month ago 15
Java Question

Calendar functionality

Input date is

2016-01-01
, but why output shows
2016/02/01
?

String df = "2016-01-01";
String enddate="";
SimpleDateFormat DATE_FORMAT_QUERY = new SimpleDateFormat("yyyyMMdd'T'HHmmss'Z'");

Calendar cal=Calendar.getInstance();
String[] dateStr=df.split("-");
int year=Integer.parseInt(dateStr[0]);
int month=Integer.parseInt(dateStr[1]);
int day=Integer.parseInt(dateStr[2]);
cal.set(year,month,day,23, 59,59);
System.out.println(cal.getTime());
enddate=DATE_FORMAT_QUERY.format(cal.getTime());
System.out.println(enddate);


Output:

Mon Feb 01 23:59:59 EST 2016 20160201T235959Z

Answer

ANSWER TO YOUR QUESTION

Input date is 2016-01-01, but why output shows 2016/02/01?

Because Calendar::month is 0-based.

month - the value used to set the MONTH calendar field. Month value is 0-based. e.g., 0 for January.

You should use

int month=Integer.parseInt(dateStr[1] - 1);

CORRECT SOLUTION

NEVER parse manually a String containing a Date, better get date with SimpleDateFormat and use it to set Calendar time:

SimpleDateFormat dfo = new SimpleDateFormat("yyyy-MM-dd");
Calendar cal=Calendar.getInstance();
cal.setTime(dfo.parse("2016-01-01"));

OUTPUT:

Fri Jan 01 00:00:00 CET 2016
20160101T000000Z