How can I find the Last working day of a month in Java.If the last day of a month is Saturday or Sunday the last working day should be on Friday. For example if March 31 is Sunday, the last working day is March 29 Friday.
For getting the current month
Date today = new Date();
Calendar calendar = Calendar.getInstance();
calendar.setTime(today);
calendar.add(Calendar.MONTH, 1);
LocalDate.now( ZoneId.of( "America/Montreal" ) ) // Today
.with( TemporalAdjusters.firstDayOfNextMonth() ) // First of next month.
.with( org.threeten.extra.Temporals.previousWorkingDay() ) // Move backwards in time, looking for first day that is not Saturday nor Sunday.
You are use the troublesome old date-time classes, now legacy, supplanted by the java.time classes.
The LocalDate class represents a date-only value without time-of-day and without time zone.
A time zone is crucial in determining a date. For any given moment, the date varies around the globe by zone. For example, a few minutes after midnight in Paris France is a new day while still “yesterday” in Montréal Québec.
Specify a proper time zone name in the format of continent/region, such as America/Montreal, Africa/Casablanca, or Pacific/Auckland. Never use the 3-4 letter abbreviation such as EST or IST as they are not true time zones, not standardized, and not even unique(!).
ZoneId z = ZoneId.of( "America/Montreal" );
LocalDate today = LocalDate.now( z );
The TemporalAdjuster interface provides a way to adjust date-time values. The TemporalAdjusters class (note the plural s) provides several handy implementations.
LocalDate endOfMonth = today.with( TemporalAdjusters.lastDayOfMonth() );
The ThreeTen-Extra project extends java.time with additional functionality. This includes more TemporalAdjuster implementations. One of those is previousWorkingDay to skip over Saturday and Sunday. To use this, we need to step past the end of month as that day itself may be a working day.
LocalDate previousWorkingDay = endOfMonth.plusDays( 1 ).with( org.threeten.extra.Temporals.previousWorkingDay() );
The java.time framework is built into Java 8 and later. These classes supplant the troublesome old legacy date-time classes such as java.util.Date, Calendar, & SimpleDateFormat.
The Joda-Time project, now in maintenance mode, advises migration to the java.time classes.
To learn more, see the Oracle Tutorial. And search Stack Overflow for many examples and explanations. Specification is JSR 310.
Where to obtain the java.time classes?
The ThreeTen-Extra project extends java.time with additional classes. This project is a proving ground for possible future additions to java.time. You may find some useful classes here such as Interval, YearWeek, YearQuarter, and more.
Try This
Date today = new Date();
Calendar calendar = Calendar.getInstance();
calendar.setTime(today);
calendar.add(Calendar.MONTH, 1);//Used for finding next month
calendar.set(Calendar.DAY_OF_MONTH, 1);//Setting the Day of month as 1 for starting
do{
calendar.add(Calendar.DATE, -1); //In the first case decease day by 1 so get the this months last day
} while (calendar.get(Calendar.DAY_OF_WEEK) == Calendar.SATURDAY
|| calendar.get(Calendar.DAY_OF_WEEK) == Calendar.SUNDAY ); // Checking whether the last day is saturday or sunday then it will decrease by 1
Date lastDayOfMonth = calendar.getTime();
DateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
System.out.println("Today: " + sdf.format(today));
System.out.println("Last Day of Month: " +df.format(lastDayOfMonth));