基本完成

lib/utils/format.dart

@@ -0,0 +1,35 @@
+/// 格式化日期时间
+String formatDateUS(dynamic date, [String format = 'MM/DD/YYYY hh:mm:ss a']) {
+  DateTime dateTime;
+
+  if (date is String) {
+    dateTime = DateTime.tryParse(date) ?? DateTime.now();
+  } else if (date is DateTime) {
+    dateTime = date;
+  } else {
+    dateTime = DateTime.now();
+  }
+
+  final yyyy = dateTime.year.toString();
+  final MM = dateTime.month.toString().padLeft(2, '0');
+  final dd = dateTime.day.toString().padLeft(2, '0');
+
+  // 12小时制
+  final hour12 = (dateTime.hour % 12 == 0 ? 12 : dateTime.hour % 12).toString().padLeft(2, '0');
+  final HH = dateTime.hour.toString().padLeft(2, '0'); // 24小时制备用
+  final mm = dateTime.minute.toString().padLeft(2, '0');
+  final ss = dateTime.second.toString().padLeft(2, '0');
+  final ampm = dateTime.hour >= 12 ? 'PM' : 'AM';
+
+  String result = format
+      .replaceFirst(RegExp('YYYY'), yyyy)
+      .replaceFirst(RegExp('MM'), MM)
+      .replaceFirst(RegExp('DD'), dd)
+      .replaceFirst(RegExp('hh'), hour12)
+      .replaceFirst(RegExp('HH'), HH)
+      .replaceFirst(RegExp('mm'), mm)
+      .replaceFirst(RegExp('ss'), ss)
+      .replaceFirst(RegExp('a'), ampm);
+
+  return result;
+}