I want to get time difference like -

'2h 28mins ago', 'a few seconds ago', 'a few mins ago','1 min ago', '6h ago','a day ago','a week ago', 'a few months ago'

I get event occured time as DateTime object. I can get current time with DateTime.now() I want to calculate the difference between this 2 times. I'm currently doing this using many lines of if else statements like this...

if (now.year > date.year) {
      //months ago
      if ((12 - date.month)   now.month > 11) {
        return "a year ago";
      } else if ((12 - date.month)   now.month > 1) {
        return "${(12 - date.month)   now.month} months ago";
      } else if ((12 - date.month)   now.month == 1) {
        if ((getDateCountForMonth(date.month) - date.day)   now.day > 13) {
          return "a few weeks ago";
        }
...}}

Is there a better and simple way to do this? I want to output like this - '2h 28mins ago', 'a few seconds ago', 'a few mins ago','1 min ago', '6h ago','a day ago','a week ago', 'a few months ago'

CodePudding user response：

Lets say the selected date is

DateTime date = DateTime(2022, 9, 7, 17, 30);

you can calculate the difference by calling difference on DateTime format like this:

date.difference(DateTime.now());

and you can get this difference in many format like in days, inHours, in inMinutes ,... :

var days = date.difference(DateTime.now()).inDays;

and with this the calculation may get easier.

if (days > 365) {
 //years ago
} else if (days < 365 && days > 31)  {
 // month ago
} else {
 ...
}

CodePudding user response：

I had created a function to calculate the difference for a project in past, you can make use of this function. Just call it by passing the DateTime string of which you want to compare with current timing:

String getComparedTime(String dateTime) {
    Duration difference = DateTime.now().difference(DateTime.parse(dateTime));
    final List prefix = [
      "just now",
      "second(s) ago",
      "minute(s) ago",
      "hour(s) ago",
      "day(s) ago",
      "month(s) ago",
      "year(s) ago"
    ];
    if (difference.inDays == 0) {
      if (difference.inMinutes == 0) {
        if (difference.inSeconds < 20) {
          return (prefix[0]);
        } else {
          return ("${difference.inSeconds} ${prefix[1]}");
        }
      } else {
        if (difference.inMinutes > 59) {
          return ("${(difference.inMinutes / 60).floor()} ${prefix[3]}");
        } else {
          return ("${difference.inMinutes} ${prefix[2]}");
        }
      }
    } else {
      if (difference.inDays > 30) {
        if (((difference.inDays) / 30).floor() > 12) {
          return ("${((difference.inDays / 30) / 12).floor()} ${prefix[6]}");
        } else {
          return ("${(difference.inDays / 30).floor()} ${prefix[5]}");
        }
      } else {
        return ("${difference.inDays} ${prefix[4]}");
      }
    }
  }

CodePudding user response：

String timeAgo({bigDate, smallDate, bool numericDates = false}) {
  final difference = bigDate.difference(smallDate);
  if ((difference.inDays / 7).floor() >= 1) {
    return (numericDates) ? '1 week ago' : 'Last week';
  } else if (difference.inDays >= 2) {
    return '${difference.inDays} days ago';
  } else if (difference.inDays >= 1) {
    return (numericDates) ? '1 day ago' : 'Yesterday';
  } else if (difference.inHours >= 2) {
    return '${difference.inHours} hours ago';
  } else if (difference.inHours >= 1) {
    return (numericDates) ? '1 hour ago' : 'An hour ago';
  } else if (difference.inMinutes >= 2) {
    return '${difference.inMinutes} minutes ago';
  } else if (difference.inMinutes >= 1) {
    return (numericDates) ? '1 minute ago' : 'A minute ago';
  } else if (difference.inSeconds >= 3) {
    return '${difference.inSeconds} seconds ago';
  } else {
    return 'Just now';
  }
}

/// and use like

String date = timeAgo(smallDate: DateTime(2022, 12, 14, 10, 00), bigDate: DateTime(2022, 12, 14, 12, 00),);
print('difference between to dates: $date');