CODEWITHSUNDEEP
java
junaidp
junaidp

Reputation: 11211

How to add 10 minutes to my (String) time?

I have this time:

String myTime = "14:10";

Now I want to add 10 minutes to this time, so that it would be 14:20

How can I achieve this?

Upvotes: 50

Views: 146673

Answers (8)

Hamza Polat
Hamza Polat

Reputation: 375

I used the code below to add a certain time interval to the current time.

    int interval = 30;  
    SimpleDateFormat df = new SimpleDateFormat("HH:mm");
    Calendar time = Calendar.getInstance();

    Log.i("Time ", String.valueOf(df.format(time.getTime())));

    time.add(Calendar.MINUTE, interval);

    Log.i("New Time ", String.valueOf(df.format(time.getTime())));

Upvotes: 1

Grigory Kislin
Grigory Kislin

Reputation: 18010

Java 7 Time API

    DateTimeFormatter df = DateTimeFormatter.ofPattern("HH:mm");

    LocalTime lt = LocalTime.parse("14:10");
    System.out.println(df.format(lt.plusMinutes(10)));

Upvotes: 7

rtlayzell
rtlayzell

Reputation: 608

I would recommend storing the time as integers and regulate it through the division and modulo operators, once that is done convert the integers into the string format you require.

Upvotes: 0

namalfernandolk
namalfernandolk

Reputation: 9134

You have a plenty of easy approaches within above answers. This is just another idea. You can convert it to millisecond and add the TimeZoneOffset and add / deduct the mins/hours/days etc by milliseconds.

String myTime = "14:10";
int minsToAdd = 10;
Date date = new Date();
date.setTime((((Integer.parseInt(myTime.split(":")[0]))*60 + (Integer.parseInt(myTime.split(":")[1])))+ date1.getTimezoneOffset())*60000);
System.out.println(date.getHours() + ":"+date.getMinutes());
date.setTime(date.getTime()+ minsToAdd *60000);
System.out.println(date.getHours() + ":"+date.getMinutes());

Output : 

14:10
14:20

Upvotes: 0

m0s
m0s

Reputation: 4280

Something like this 

 String myTime = "14:10";
 SimpleDateFormat df = new SimpleDateFormat("HH:mm");
 Date d = df.parse(myTime); 
 Calendar cal = Calendar.getInstance();
 cal.setTime(d);
 cal.add(Calendar.MINUTE, 10);
 String newTime = df.format(cal.getTime());

As a fair warning there might be some problems if daylight savings time is involved in this 10 minute period.

Upvotes: 101

Jon Skeet
Jon Skeet

Reputation: 1501596

I would use Joda Time, parse the time as a LocalTime, and then use

time = time.plusMinutes(10);

Short but complete program to demonstrate this:

import org.joda.time.*;
import org.joda.time.format.*;

public class Test {
    public static void main(String[] args) {
        DateTimeFormatter formatter = DateTimeFormat.forPattern("HH:mm");
        LocalTime time = formatter.parseLocalTime("14:10");
        time = time.plusMinutes(10);
        System.out.println(formatter.print(time));
    }       
}

Note that I would definitely use Joda Time instead of java.util.Date/Calendar if you possibly can - it's a much nicer API.

Upvotes: 25

KV Prajapati
KV Prajapati

Reputation: 94645

Use Calendar.add(int field,int amount) method.

Upvotes: 13

Thorbjørn Ravn Andersen
Thorbjørn Ravn Andersen

Reputation: 75386

You need to have it converted to a Date, where you can then add a number of seconds, and convert it back to a string.

Upvotes: 1

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