在 Dart/Flutter 中将日期时间转换为之前的时间

问题描述 投票：0回答：8

问题是如何将 Dart DateTime 格式化为字符串，说明经过的时间，类似于您在 Stack Overflow 上看到的时间显示方式。

还有比这更好的方法吗

String timeAgo(DateTime d) {
 Duration diff = DateTime.now().difference(d);
 if (diff.inDays > 365)
  return "${(diff.inDays / 365).floor()} ${(diff.inDays / 365).floor() == 1 ? "year" : "years"} ago";
 if (diff.inDays > 30)
  return "${(diff.inDays / 30).floor()} ${(diff.inDays / 30).floor() == 1 ? "month" : "months"} ago";
 if (diff.inDays > 7)
  return "${(diff.inDays / 7).floor()} ${(diff.inDays / 7).floor() == 1 ? "week" : "weeks"} ago";
 if (diff.inDays > 0)
  return "${diff.inDays} ${diff.inDays == 1 ? "day" : "days"} ago";
 if (diff.inHours > 0)
  return "${diff.inHours} ${diff.inHours == 1 ? "hour" : "hours"} ago";
 if (diff.inMinutes > 0)
  return "${diff.inMinutes} ${diff.inMinutes == 1 ? "minute" : "minutes"} ago";
 return "just now";
}

谢谢您并希望对其他人有帮助

flutter datetime dart timestamp
8个回答
50
投票

我使用timeago来达到确切的目的，并发现它非常有用。它具有多种格式和不同语言的支持。

17
投票

你也可以尝试我创建的这个包，Jiffy。

您可以从现在开始获取相对时间

// This returns time ago from now
Jiffy.now().fromNow(); // a few seconds ago

//You can also pass in a DateTime Object or a string or a list
Jiffy.parseFromDateTime(DateTime.now()).fromNow; // a few seconds ago
//or
Jiffy.parseFromDateTime(DateTime(2018, 10, 25)).fromNow(); // a year ago
Jiffy.parse("2020-10-25").fromNow(); // in a year

Jiffy 中的操作也很简单

var dateTime = Jiffy.now().add(hours: 3, months: 2);

dateTime.fromNow(); // in 2 months

您还可以获取距现在指定时间的相对时间

Jiffy.parseFromList([2022, 10, 25])
   .from(Jiffy.parseFromList([2022, 1, 25])); // in 10 months
9
投票

我通过使用日期时间扩展来简化Paresh的答案

创建一个名为

date_time_extension.dart

 的新 dart 文件，然后编写如下代码

extension DateTimeExtension on DateTime { String timeAgo({bool numericDates = true}) { final date2 = DateTime.now(); final difference = date2.difference(this); 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'; } } } 
然后像这样使用它


import 'package:utilities/extensions/date_time_extension.dart'; // <--- import the file you just create

product.createdAt.timeAgo(numericDates: false) // use it on your DateTime property

    



      

      
      
      

      

        

          

            

              
1
投票

              
            

          

        

        
如果您只想使用
Datetime
库，这就是您可以做到的方式。


void main() {
  final currentTime = DateTime.now();
  print('Current time: $currentTime');
  final threeWeeksAgo = currentTime.subtract(const Duration(days: 21));
  print('Three weeks ago: $threeWeeksAgo');
}

这就是你得到的：


Current time: 2022-09-29 11:26:58.350
Three weeks ago: 2022-09-08 11:26:58.350

    



      

      
      
      

      

        

          

            

              
1
投票

              
            

          

        

        
String timeAgoCustom(DateTime d) {             // <-- Custom method Time Show  (Display Example  ==> 'Today 7:00 PM')     // WhatsApp Time Show Status Shimila
 Duration diff = DateTime.now().difference(d);
 if (diff.inDays > 365)
  return "${(diff.inDays / 365).floor()} ${(diff.inDays / 365).floor() == 1 ? "year" : "years"} ago";
 if (diff.inDays > 30)
  return "${(diff.inDays / 30).floor()} ${(diff.inDays / 30).floor() == 1 ? "month" : "months"} ago";
 if (diff.inDays > 7)
  return "${(diff.inDays / 7).floor()} ${(diff.inDays / 7).floor() == 1 ? "week" : "weeks"} ago";
 if (diff.inDays > 0)
  return "${DateFormat.E().add_jm().format(d)}";
 if (diff.inHours > 0)
  return "Today ${DateFormat('jm').format(d)}";
 if (diff.inMinutes > 0)
  return "${diff.inMinutes} ${diff.inMinutes == 1 ? "minute" : "minutes"} ago";
 return "just now";
}

Add This Package --> intl: ^0.17.0



Time Show Example (Today 8:29 PM)

    



      

      
      
      

      

        

          

            

              
0
投票

              
            

          

        

        
你可以使用这个方法，它会给你很多时间。


String convertToAgo(String dateTime) {
  DateTime input =
      DateFormat('yyyy-MM-DDTHH:mm:ss.SSSSSSZ').parse(dateTime, true);
  Duration diff = DateTime.now().difference(input);

  if (diff.inDays >= 1) {
    return '${diff.inDays} day${diff.inDays == 1 ? '' : 's'} ago';
  } else if (diff.inHours >= 1) {
    return '${diff.inHours} hour${diff.inHours == 1 ? '' : 's'} ago';
  } else if (diff.inMinutes >= 1) {
    return '${diff.inMinutes} minute${diff.inMinutes == 1 ? '' : 's'} ago';
  } else if (diff.inSeconds >= 1) {
    return '${diff.inSeconds} second${diff.inSeconds == 1 ? '' : 's'} ago';
  } else {
    return 'just now';
  }
}

    



      

      
      
      

      

        

          

            

              
0
投票

              
            

          

        

        
希望你能得到答案！您只需要在此方法中传递您的时间戳值，您就会得到一个前段时间格式化的字符串。


String getVerboseDateTimeRepresentation(DateTime dateTime) {
    DateTime now = DateTime.now().toLocal();

    DateTime localDateTime = dateTime.toLocal();

    if (localDateTime.difference(now).inDays == 0) {
      var differenceInHours = localDateTime.difference(now).inHours.abs();
      var differenceInMins = localDateTime.difference(now).inMinutes.abs();

      if (differenceInHours > 0) {
        return '$differenceInHours hours ago';
      } else if (differenceInMins > 2) {
        return '$differenceInMins mins ago';
      } else {
        return 'Just now';
      }
    }

    String roughTimeString = DateFormat('jm').format(dateTime);

    if (localDateTime.day == now.day &&
        localDateTime.month == now.month &&
        localDateTime.year == now.year) {
      return roughTimeString;
    }

    DateTime yesterday = now.subtract(const Duration(days: 1));

    if (localDateTime.day == yesterday.day &&
        localDateTime.month == now.month &&
        localDateTime.year == now.year) {
      return 'Yesterday';
    }

    if (now.difference(localDateTime).inDays < 4) {
      String weekday = DateFormat(
        'EEEE',
      ).format(localDateTime);

      return '$weekday, $roughTimeString';
    }

    return '${DateFormat('yMd').format(dateTime)}, $roughTimeString';
  }

    



      

      
      
      

      

        

          

            

              
-1
投票

              
            

          

        

        
@Alex289 答案的变体


extension DateHelpers on DateTime {

  String toTimeAgoLabel({bool isIntervalNumericVisible = true}) {
    final now = DateTime.now();
    final durationSinceNow = now.difference(this);

    final inDays = durationSinceNow.inDays;
    if (inDays >= 1) {
      return (inDays / 7).floor() >= 1
          ? isIntervalNumericVisible ? '1 week ago' : 'Last week'
          : inDays >= 2
              ? '$inDays days ago'
              : isIntervalNumericVisible
                  ? '1 day ago'
                  : 'Yesterday';
    }

    final inHours = durationSinceNow.inHours;
    if (inHours >= 1) {
      return inHours >= 2
          ? '$inHours hours ago'
          : isIntervalNumericVisible
              ? '1 hour ago'
              : 'An hour ago';
    }

    final inMinutes = durationSinceNow.inMinutes;
    if (inMinutes >= 2) {
      return inMinutes >= 2
          ? '$inMinutes minutes ago'
          : isIntervalNumericVisible
              ? '1 minute ago'
              : 'A minute ago';
    }

    final inSeconds = durationSinceNow.inSeconds;
    return inSeconds >= 3 ? '$inSeconds seconds ago' : 'Just now';
  }
}

    



      

      
    

  

  

    
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