How to convert seconds to minutes in Dart? - flutter

Question

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();
}
}
}
}

Answer 1

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

Answer 2

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
}

Answer 3

You can try this :
int minutes = (seconds / 60).truncate();
String minutesStr = (minutes % 60).toString().padLeft(2, '0');

Answer 4

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.

Answer 5

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*/

Answer 6

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();
}