修改资讯发布不显示具体时间

lib/ui/home/public_infomation/public_infomation_card.dart

@@ -42,10 +42,7 @@ class PublicInfomationCard extends StatelessWidget {
                       children: [
                         // Text('测试'),
                         Spacer(),
-                        Text('发布于 ${DateUtil.formatDate(
-                          model.createDateDT,
-                          format: 'yyyy-MM-dd HH:mm',
-                        )}'),
+                        Text('发布于 ${RelativeDateFormat.format(model.createDateDT)}'),
                       ],
                     ),
                   ),
@@ -64,3 +61,73 @@ class PublicInfomationCard extends StatelessWidget {
     );
   }
 }
+class RelativeDateFormat {
+  static final num ONE_MINUTE = 60000;
+  static final num ONE_HOUR = 3600000;
+  static final num ONE_DAY = 86400000;
+  static final num ONE_WEEK = 604800000;
+
+  static final String ONE_SECOND_AGO = "秒前";
+  static final String ONE_MINUTE_AGO = "分钟前";
+  static final String ONE_HOUR_AGO = "小时前";
+  static final String ONE_DAY_AGO = "天前";
+  static final String ONE_MONTH_AGO = "月前";
+  static final String ONE_YEAR_AGO = "年前";
+
+//时间转换
+  static String format(DateTime? date) {
+    num delta = DateTime.now().millisecondsSinceEpoch - date!.millisecondsSinceEpoch;
+    if (delta < 1 * ONE_MINUTE) {
+      num seconds = toSeconds(delta);
+      return (seconds <= 0 ? 1 : seconds).toInt().toString() + ONE_SECOND_AGO;
+    }
+    if (delta < 60 * ONE_MINUTE) {
+      num minutes = toMinutes(delta);
+      return (minutes <= 0 ? 1 : minutes).toInt().toString() + ONE_MINUTE_AGO;
+    }
+    if (delta < 24 * ONE_HOUR) {
+      num hours = toHours(delta);
+      return (hours <= 0 ? 1 : hours).toInt().toString() + ONE_HOUR_AGO;
+    }
+    if (delta < 48 * ONE_HOUR) {
+      return "昨天";
+    }
+    if (delta < 30 * ONE_DAY) {
+      num days = toDays(delta);
+      return (days <= 0 ? 1 : days).toInt().toString() + ONE_DAY_AGO;
+    }
+    if (delta < 12 * 4 * ONE_WEEK) {
+      num months = toMonths(delta);
+      return (months <= 0 ? 1 : months).toInt().toString() + ONE_MONTH_AGO;
+    } else {
+      num years = toYears(delta);
+      return (years <= 0 ? 1 : years).toInt().toString() + ONE_YEAR_AGO;
+    }
+  }
+
+  static num toSeconds(num date) {
+    return date / 1000;
+  }
+
+  static num toMinutes(num date) {
+    return toSeconds(date) / 60;
+  }
+
+  static num toHours(num date) {
+    return toMinutes(date) / 60;
+  }
+
+  static num toDays(num date) {
+    return toHours(date) / 24;
+  }
+
+  static num toMonths(num date) {
+    return toDays(date) / 30;
+  }
+
+  static num toYears(num date) {
+    return toMonths(date) / 365;
+  }
+}
+
+