Add minutes to date

Opposite of subtracting minutes from a java date, this example will show how to add minutes to a date using Calendar.add, java 8 date time api, joda’s DateTime.plusMinutes and apache commons DateUtils.addMinutes. In the examples below, we will set a date that represents new years eve, December 31st, then add minutes to return a date representing new years day or January 1st.

Straight up Java

@Test
public void add_minutes_to_date_in_java () {

    Calendar newYearsEve = Calendar.getInstance();
    newYearsEve.set(2012, 11, 31, 23, 59, 0);

    Calendar newYearsDay = Calendar.getInstance();
    newYearsDay.setTimeInMillis(newYearsEve.getTimeInMillis());
    newYearsDay.add(Calendar.MINUTE, 1);

    SimpleDateFormat dateFormatter = new SimpleDateFormat("MM/dd/yyyy HH:mm:ss z");

    logger.info(dateFormatter.format(newYearsEve.getTime()));
    logger.info(dateFormatter.format(newYearsDay.getTime()));

    assertTrue(newYearsDay.after(newYearsEve));
}

Output

12/31/2012 23:59:00 CST
01/01/2013 00:00:00 CST

Java 8 Date and Time API

Java 8 LocalDateTime.plusMinutes will return a copy of the LocalDateTime with the specified number of minutes added.

@Test
public void add_minutes_to_date_in_java8() {

    LocalDateTime newYearsEve = LocalDateTime.of(2012, Month.DECEMBER, 31,
            23, 59);
    LocalDateTime newYearsDay = newYearsEve.plusMinutes(1);

    java.time.format.DateTimeFormatter formatter = java.time.format.DateTimeFormatter
            .ofPattern("MM/dd/yyyy HH:mm:ss S");

    logger.info(newYearsEve.format(formatter));
    logger.info(newYearsDay.format(formatter));

    assertTrue(newYearsDay.isAfter(newYearsEve));
}

Output

12/31/2012 23:59:00 0
01/01/2013 00:00:00 0

Joda Time

Joda DateTime.plusMinutes will return a copy the DateTime plus the specified number of minutes.

@Test
public void add_minutes_to_date_in_java_with_joda () {

    DateTime newYearsEve = new DateTime(2012, 12, 31, 23, 59, 0, 0);
    DateTime newYearsDay = newYearsEve.plusMinutes(1);

    DateTimeFormatter fmt = DateTimeFormat.forPattern("MM/dd/yyyy HH:mm:ss z");

    logger.info(newYearsEve.toString(fmt));
    logger.info(newYearsDay.toString(fmt));

    assertTrue(newYearsDay.isAfter(newYearsEve));
}

Output

12/31/2012 23:59:00 CST
01/01/2013 00:00:00 CST

Apache Commons

Apache commons DateUtils.addMinutes will adds a number of minutes to the date returning a new object.

@Test
public void add_minutes_to_date_in_java_with_apachecommons () {

    Calendar newYearsEve = Calendar.getInstance();
    newYearsEve.set(2012, 11, 31, 23, 59, 0);

    Date newYearsDay = DateUtils.addMinutes(newYearsEve.getTime(), 1);

    SimpleDateFormat dateFormatter = new SimpleDateFormat("MM/dd/yyyy HH:mm:ss z");

    logger.info(dateFormatter.format(newYearsEve.getTime()));
    logger.info(dateFormatter.format(newYearsDay));

    assertTrue(newYearsDay.after(newYearsEve.getTime()));
}

Output

12/31/2012 23:59:00 CST
01/01/2013 00:00:00 CST