I have a String which has the time. I need to round it off to the nearest hour and also the nearest minute. How do I do it in java? Ex: String time="12:58:15"; I need to round it off to 1:00:00 and also 12:58:00
For calendar operations you have to use Calendar class. In your case you would do something like this:
package test;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
public class TestDate {
public static void main(String[] args) {
Calendar c = new GregorianCalendar();
c.set(Calendar.HOUR_OF_DAY, 12);
c.set(Calendar.MINUTE, 58);
c.set(Calendar.SECOND, 15);
Date d = c.getTime();
System.out.println("Start point: " + d.toString());
System.out.println("Nearest whole minute: " + toNearestWholeMinute(d));
System.out.println("Nearest whole hour: " + toNearestWholeHour(d));
}
static Date toNearestWholeMinute(Date d) {
Calendar c = new GregorianCalendar();
c.setTime(d);
if (c.get(Calendar.SECOND) >= 30)
c.add(Calendar.MINUTE, 1);
c.set(Calendar.SECOND, 0);
return c.getTime();
}
static Date toNearestWholeHour(Date d) {
Calendar c = new GregorianCalendar();
c.setTime(d);
if (c.get(Calendar.MINUTE) >= 30)
c.add(Calendar.HOUR, 1);
c.set(Calendar.MINUTE, 0);
c.set(Calendar.SECOND, 0);
return c.getTime();
}
}
And the result:
Start point: Tue Nov 22 12:58:15 CET 2011
Nearest whole minute: Tue Nov 22 12:58:00 CET 2011
Nearest whole hour: Tue Nov 22 13:00:00 CET 2011
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