How to add minutes to my Date

Question

I have this date object:

SimpleDateFormat df = new SimpleDateFormat(\"yyyy-mm-dd HH:mm\");
Date d1 = df.parse(interviewList.get(37).getTime());

Answer 1

Once you have you date parsed, I use this utility function to add hours, minutes or seconds:

public class DateTimeUtils {
    private static final long ONE_HOUR_IN_MS = 3600000;
    private static final long ONE_MIN_IN_MS = 60000;
    private static final long ONE_SEC_IN_MS = 1000;

    public static Date sumTimeToDate(Date date, int hours, int mins, int secs) {
        long hoursToAddInMs = hours * ONE_HOUR_IN_MS;
        long minsToAddInMs = mins * ONE_MIN_IN_MS;
        long secsToAddInMs = secs * ONE_SEC_IN_MS;
        return new Date(date.getTime() + hoursToAddInMs + minsToAddInMs + secsToAddInMs);
    }
}

Be careful when adding long periods of time, 1 day is not always 24 hours (daylight savings-type adjustments, leap seconds and so on), Calendar is recommended for that.

Answer 2

you can use DateUtils class in org.apache.commons.lang3.time package

int addMinuteTime = 5;
Date targetTime = new Date(); //now
targetTime = DateUtils.addMinutes(targetTime, addMinuteTime); //add minute

Answer 3

In order to avoid any dependency you can use java.util.Calendar as follow:

    Calendar now = Calendar.getInstance();
    now.add(Calendar.MINUTE, 10);
    Date teenMinutesFromNow = now.getTime();

In Java 8 we have new API:

    LocalDateTime dateTime = LocalDateTime.now().plus(Duration.of(10, ChronoUnit.MINUTES));
    Date tmfn = Date.from(dateTime.atZone(ZoneId.systemDefault()).toInstant());

Answer 4

This is incorrectly specified:

SimpleDateFormat df = new SimpleDateFormat("yyyy-mm-dd HH:mm");

You're using minutes instead of month (MM)

Answer 5

The issue for you is that you are using mm. You should use MM. MM is for month and mm is for minutes. Try with yyyy-MM-dd HH:mm

Other approach:

It can be as simple as this (other option is to use joda-time)

static final long ONE_MINUTE_IN_MILLIS=60000;//millisecs

Calendar date = Calendar.getInstance();
long t= date.getTimeInMillis();
Date afterAddingTenMins=new Date(t + (10 * ONE_MINUTE_IN_MILLIS));

Answer 6

Convenience method for implementing @Pangea's answer:

/*
*  Convenience method to add a specified number of minutes to a Date object
*  From: http://stackoverflow.com/questions/9043981/how-to-add-minutes-to-my-date
*  @param  minutes  The number of minutes to add
*  @param  beforeTime  The time that will have minutes added to it
*  @return  A date object with the specified number of minutes added to it 
*/
private static Date addMinutesToDate(int minutes, Date beforeTime){
    final long ONE_MINUTE_IN_MILLIS = 60000;//millisecs

    long curTimeInMs = beforeTime.getTime();
    Date afterAddingMins = new Date(curTimeInMs + (minutes * ONE_MINUTE_IN_MILLIS));
    return afterAddingMins;
}