Initial commit

lib/date_utils.dart

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+import 'package:flutter/material.dart';
+import 'package:intl/intl.dart';
+
+/// Utilities for handling DateTime objects.
+extension DateUtils on DateTime {
+  /// Create a new instance with identical values.
+  DateTime copy() => DateTime(
+        this.year,
+        this.month,
+        this.day,
+        this.hour,
+        this.minute,
+      );
+
+  /// Create a new instance with the same date but a different time.
+  DateTime copyWithTime(TimeOfDay time) => DateTime(
+        this.year,
+        this.month,
+        this.day,
+        time.hour,
+        time.minute,
+      );
+
+  /// Get a string representation of the represented day suitable for display.
+  String get dateString {
+    final now = DateTime.now();
+    if (this.year == now.year && this.month == now.month) {
+      if (this.day == now.day) {
+        return 'Today';
+      } else if (this.day == now.day + 1) {
+        return 'Tomorrow';
+      }
+    }
+
+    final format = DateFormat.yMd();
+    return format.format(this);
+  }
+
+  /// Get the time of day represented by this object.
+  TimeOfDay get timeOfDay => TimeOfDay.fromDateTime(this);
+}