How to convert seconds to minutes in Dart?

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I'm learning Dart & flutter for 2 days and I'm confused about how to convert seconds (for example 1500sec) to minutes.

For studying the new language, I'm making Pomodoro timer, and for test purposes, I want to convert seconds to MM: SS format. So far, I got this code below, but I'm stuck for a couple of hours now... I googled it but could not solve this problem, so I used Stackoverflow. How should I fix the code?

int timeLeftInSec = 1500;
void startOrStop() {
  timer = Timer.periodic(Duration(seconds: 1), (timer) {
    setState(() {
      if (timeLeftInSec > 0) {
        timeLeftInSec--;
        timeLeft = Duration(minutes: ???, seconds: ???)
      } else {
        timer.cancel();
      }
    }
  }
}
dart flutter
6 Answers

Without formatting:

int mins = Duration(seconds: 120).inMinutes; // 2 mins

Formatting:

String formatTime(int seconds) {
  return '${(Duration(seconds: seconds))}'.split('.')[0].padLeft(8, '0');
}

void main() {
  String time = formatTime(3700); // 01:01:11
}
user_66186220

This code works for me

formatedTime({required int timeInSecond}) {
    int sec = time % 60;
    int min = (time / 60).floor();
    String minute = min.toString().length <= 1 ? "0$min" : "$min";
    String second = sec.toString().length <= 1 ? "0$sec" : "$sec";
    return "$minute : $second";
}

now just call the function

formatedTime(timeInSecond: 152)

formated time example

enter image description here

user_141021800

You can try this :

int minutes = (seconds / 60).truncate();
String minutesStr = (minutes % 60).toString().padLeft(2, '0');
user_104095670

This is the way I've achieved desired format of MM:SS

Duration(seconds: _secondsLeft--).toString().substring(2, 7);

Here is an example of what toString method returns:

d = Duration(days: 0, hours: 1, minutes: 10, microseconds: 500);
d.toString();  // "1:10:00.000500"

So with the substring method chained you can easily achive more formats e.g. HH:MM:SS etc.

user_34787160

Check out this piece of code for a count down timer with formatted output

import 'dart:async';

void main(){
  late Timer timer;
  int startSeconds = 120; //time limit
  String timeToShow = "";
  timer =  Timer.periodic(Duration(seconds:1 ),(time){
    startSeconds = startSeconds-1;
    if(startSeconds ==0){
      timer.cancel();
     }

    int minutes = (startSeconds/60).toInt();
    int seconds = (startSeconds%60);
   timeToShow = minutes.toString().padLeft(2,"0")+"."+seconds.toString().padLeft(2,"0");
   print(timeToShow);
  });
}

    /*output
    01.59
    01.58 
    01.57
    ...
    ...
    ...
    00.02
    00.01
    00.00*/
user_140752420 
static int timePassedFromNow(String? dateTo) {
  if (dateTo != null) {
    DateTime targetDateTime = DateTime.parse(dateTo);
    DateTime dateTimeNow = DateTime.now();
    if (targetDateTime.isAfter(dateTimeNow)) {
      Duration differenceInMinutes = dateTimeNow.difference(targetDateTime);
      return differenceInMinutes.inSeconds;
    }
  }

  return 0;
}

static String timeLeft(int seconds) {
int diff = seconds;

int days = diff ~/ (24 * 60 * 60);
diff -= days * (24 * 60 * 60);
int hours = diff ~/ (60 * 60);
diff -= hours * (60 * 60);
int minutes = diff ~/ (60);
diff -= minutes * (60);

String result = "${twoDigitNumber(days)}:${twoDigitNumber(hours)}:${twoDigitNumber(minutes)}";

return result;
}

static String twoDigitNumber(int? dateTimeNumber) {
  if (dateTimeNumber == null) return "0";
  return (dateTimeNumber < 9 ? "0$dateTimeNumber" : dateTimeNumber).toString();
}
user_47184060
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