java get the first date and last date of given month and given year [duplicate]

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java.time.YearMonth methods atDay & atEndOfMonth

The java.time framework built into Java 8+ (Tutorial) has commands for this.

The aptly-named YearMonth class represents a month of a year, without any specific day or time. From there we can ask for the first and days of the month.

YearMonth yearMonth = YearMonth.of( 2015, 1 );     // 2015-01. January of 2015.
LocalDate firstOfMonth = yearMonth.atDay( 1 );     // 2015-01-01
LocalDate lastOfMonth = yearMonth.atEndOfMonth();  // 2015-01-31

About java.time

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.

You may exchange java.time objects directly with your database. Use a JDBC driver compliant with JDBC 4.2 or later. No need for strings, no need for java.sql.* classes.

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.

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