feat(ui): Add date formatters for timestamps

packages/stream_chat_flutter/CHANGELOG.md

@@ -1,5 +1,10 @@
 ## Upcoming
 
+✅ Added
+
+- Added formatter properties to theme data classes for customizing date/timestamp
+  formatting. [[#2312]](https://github.com/GetStream/stream-chat-flutter/issues/2312) [[#2406]](https://github.com/GetStream/stream-chat-flutter/issues/2406)
+
 🐞 Fixed
 
 - Fixed mistakenly passing the hyperlink text to the `onLinkTap` callback instead of the actual `href`.

packages/stream_chat_flutter/lib/src/message_widget/bottom_row.dart

@@ -215,7 +215,13 @@ class BottomRow extends StatelessWidget {
         StreamTimestamp(
           date: message.createdAt.toLocal(),
           style: messageTheme.createdAtStyle,
-          formatter: (_, date) => Jiffy.parseFromDateTime(date).jm,
+          formatter: (context, date) {
+            if (messageTheme.createdAtFormatter case final formatter?) {
+              return formatter.call(context, date);
+            }
+
+            return Jiffy.parseFromDateTime(date).jm;
+          },
         ),
     ];
 

packages/stream_chat_flutter/lib/src/misc/date_divider.dart

@@ -12,6 +12,7 @@ class StreamDateDivider extends StatelessWidget {
     super.key,
     required this.dateTime,
     this.uppercase = false,
+    this.formatter,
   });
 
   /// [DateTime] to display
@@ -20,6 +21,9 @@ class StreamDateDivider extends StatelessWidget {
   /// If text is uppercase
   final bool uppercase;
 
+  /// Custom formatter for the date
+  final DateFormatter? formatter;
+
   @override
   Widget build(BuildContext context) {
     final chatThemeData = StreamChatTheme.of(context);
@@ -36,6 +40,12 @@ class StreamDateDivider extends StatelessWidget {
             color: chatThemeData.colorTheme.barsBg,
           ),
           formatter: (context, date) {
+            if (formatter case final formatter?) {
+              final timestamp = formatter.call(context, date);
+              if (uppercase) return timestamp.toUpperCase();
+              return timestamp;
+            }
+
             final timestamp = switch (date) {
               _ when date.isToday => context.translations.todayLabel,
               _ when date.isYesterday => context.translations.yesterdayLabel,

packages/stream_chat_flutter/lib/src/misc/timestamp.dart

@@ -12,11 +12,11 @@ class StreamTimestamp extends StatelessWidget {
   const StreamTimestamp({
     super.key,
     required this.date,
-    this.formatter = formatDate,
+    DateFormatter? formatter,
     this.style,
     this.textAlign,
     this.textDirection,
-  });
+  }) : formatter = formatter ?? formatDate;
 
   /// The date to show in the timestamp.
   final DateTime date;

packages/stream_chat_flutter/lib/src/scroll_view/channel_scroll_view/stream_channel_list_tile.dart

@@ -5,6 +5,7 @@ import 'package:stream_chat_flutter/src/channel/stream_draft_message_preview_tex
 import 'package:stream_chat_flutter/src/message_widget/sending_indicator_builder.dart';
 import 'package:stream_chat_flutter/src/misc/empty_widget.dart';
 import 'package:stream_chat_flutter/src/misc/timestamp.dart';
+import 'package:stream_chat_flutter/src/utils/date_formatter.dart';
 import 'package:stream_chat_flutter/stream_chat_flutter.dart';
 
 /// A widget that displays a channel preview.
@@ -174,6 +175,7 @@ class StreamChannelListTile extends StatelessWidget {
         ChannelLastMessageDate(
           channel: channel,
           textStyle: channelPreviewTheme.lastMessageAtStyle,
+          formatter: channelPreviewTheme.lastMessageAtFormatter,
         );
 
     return BetterStreamBuilder<bool>(
@@ -265,6 +267,7 @@ class ChannelLastMessageDate extends StatelessWidget {
     super.key,
     required this.channel,
     this.textStyle,
+    this.formatter,
   }) : assert(
           channel.state != null,
           'Channel ${channel.id} is not initialized',
@@ -276,17 +279,21 @@ class ChannelLastMessageDate extends StatelessWidget {
   /// The style of the text displayed
   final TextStyle? textStyle;
 
+  /// The formatter to format the date.
+  final DateFormatter? formatter;
+
   @override
-  Widget build(BuildContext context) => BetterStreamBuilder<DateTime>(
-        stream: channel.lastMessageAtStream,
-        initialData: channel.lastMessageAt,
-        builder: (context, lastMessageAt) {
-          return StreamTimestamp(
-            date: lastMessageAt.toLocal(),
-            style: textStyle,
-          );
-        },
-      );
+  Widget build(BuildContext context) {
+    return BetterStreamBuilder<DateTime>(
+      stream: channel.lastMessageAtStream,
+      initialData: channel.lastMessageAt,
+      builder: (context, lastMessageAt) => StreamTimestamp(
+        date: lastMessageAt.toLocal(),
+        style: textStyle,
+        formatter: formatter,
+      ),
+    );
+  }
 }
 
 /// A widget that displays the subtitle for [StreamChannelListTile].

packages/stream_chat_flutter/lib/src/scroll_view/draft_scroll_view/stream_draft_list_tile.dart

@@ -136,6 +136,7 @@ class DraftMessageContent extends StatelessWidget {
         StreamTimestamp(
           date: draft.createdAt.toLocal(),
           style: theme.draftTimestampStyle,
+          formatter: theme.draftTimestampFormatter,
         ),
       ],
     );

packages/stream_chat_flutter/lib/src/scroll_view/message_search_scroll_view/stream_message_search_list_tile.dart

@@ -1,5 +1,6 @@
 import 'package:flutter/material.dart';
 import 'package:stream_chat_flutter/src/misc/timestamp.dart';
+import 'package:stream_chat_flutter/src/utils/date_formatter.dart';
 import 'package:stream_chat_flutter/stream_chat_flutter.dart';
 
 /// A widget that displays a message search item.
@@ -140,6 +141,7 @@ class StreamMessageSearchListTile extends StatelessWidget {
             MessageSearchTileMessageDate(
               message: message,
               textStyle: channelPreviewTheme.lastMessageAtStyle,
+              formatter: channelPreviewTheme.lastMessageAtFormatter,
             ),
           ],
         );
@@ -212,6 +214,7 @@ class MessageSearchTileMessageDate extends StatelessWidget {
     super.key,
     required this.message,
     this.textStyle,
+    this.formatter,
   });
 
   /// The searched message response.
@@ -220,12 +223,16 @@ class MessageSearchTileMessageDate extends StatelessWidget {
   /// The text style to use for the date.
   final TextStyle? textStyle;
 
+  /// An optional formatter to format the date.
+  final DateFormatter? formatter;
+
   @override
   Widget build(BuildContext context) {
     final createdAt = message.createdAt;
     return StreamTimestamp(
       date: createdAt.toLocal(),
       style: textStyle,
+      formatter: formatter,
     );
   }
 }

packages/stream_chat_flutter/lib/src/scroll_view/thread_scroll_view/stream_thread_list_tile.dart

@@ -260,6 +260,7 @@ class ThreadLatestReply extends StatelessWidget {
                   StreamTimestamp(
                     date: latestReply.createdAt.toLocal(),
                     style: theme.threadLatestReplyTimestampStyle,
+                    formatter: theme.threadLatestReplyTimestampFormatter,
                   ),
                 ],
               ),

packages/stream_chat_flutter/lib/src/theme/channel_preview_theme.dart

@@ -2,6 +2,7 @@ import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:stream_chat_flutter/src/theme/avatar_theme.dart';
 import 'package:stream_chat_flutter/src/theme/stream_chat_theme.dart';
+import 'package:stream_chat_flutter/src/utils/date_formatter.dart';
 
 /// {@template channelPreviewTheme}
 /// Overrides the default style of [ChannelPreview] descendants.
@@ -70,6 +71,7 @@ class StreamChannelPreviewThemeData with Diagnosticable {
     this.avatarTheme,
     this.unreadCounterColor,
     this.indicatorIconSize,
+    this.lastMessageAtFormatter,
   });
 
   /// Theme for title
@@ -90,6 +92,21 @@ class StreamChannelPreviewThemeData with Diagnosticable {
   /// Indicator icon size
   final double? indicatorIconSize;
 
+  /// Formatter for the last message timestamp.
+  ///
+  /// If null, uses the default date formatting.
+  ///
+  /// Example:
+  /// ```dart
+  /// StreamChannelPreviewThemeData(
+  ///   lastMessageAtStyle: TextStyle(...),
+  ///   lastMessageAtFormatter: (context, date) {
+  ///     return Jiffy.parseFromDateTime(date).format('d MMMM'); // "23 May"
+  ///   },
+  /// )
+  /// ```
+  final DateFormatter? lastMessageAtFormatter;
+
   /// Copy with theme
   StreamChannelPreviewThemeData copyWith({
     TextStyle? titleStyle,
@@ -98,6 +115,7 @@ class StreamChannelPreviewThemeData with Diagnosticable {
     StreamAvatarThemeData? avatarTheme,
     Color? unreadCounterColor,
     double? indicatorIconSize,
+    DateFormatter? lastMessageAtFormatter,
   }) {
     return StreamChannelPreviewThemeData(
       titleStyle: titleStyle ?? this.titleStyle,
@@ -106,6 +124,8 @@ class StreamChannelPreviewThemeData with Diagnosticable {
       avatarTheme: avatarTheme ?? this.avatarTheme,
       unreadCounterColor: unreadCounterColor ?? this.unreadCounterColor,
       indicatorIconSize: indicatorIconSize ?? this.indicatorIconSize,
+      lastMessageAtFormatter:
+          lastMessageAtFormatter ?? this.lastMessageAtFormatter,
     );
   }
 
@@ -125,6 +145,8 @@ class StreamChannelPreviewThemeData with Diagnosticable {
       titleStyle: TextStyle.lerp(a.titleStyle, b.titleStyle, t),
       unreadCounterColor:
           Color.lerp(a.unreadCounterColor, b.unreadCounterColor, t),
+      lastMessageAtFormatter:
+          t < 0.5 ? a.lastMessageAtFormatter : b.lastMessageAtFormatter,
     );
   }
 
@@ -139,6 +161,8 @@ class StreamChannelPreviewThemeData with Diagnosticable {
           other.lastMessageAtStyle,
       avatarTheme: avatarTheme?.merge(other.avatarTheme) ?? other.avatarTheme,
       unreadCounterColor: other.unreadCounterColor,
+      lastMessageAtFormatter:
+          other.lastMessageAtFormatter ?? lastMessageAtFormatter,
     );
   }
 
@@ -152,7 +176,8 @@ class StreamChannelPreviewThemeData with Diagnosticable {
           lastMessageAtStyle == other.lastMessageAtStyle &&
           avatarTheme == other.avatarTheme &&
           unreadCounterColor == other.unreadCounterColor &&
-          indicatorIconSize == other.indicatorIconSize;
+          indicatorIconSize == other.indicatorIconSize &&
+          lastMessageAtFormatter == other.lastMessageAtFormatter;
 
   @override
   int get hashCode =>
@@ -161,7 +186,8 @@ class StreamChannelPreviewThemeData with Diagnosticable {
       lastMessageAtStyle.hashCode ^
       avatarTheme.hashCode ^
       unreadCounterColor.hashCode ^
-      indicatorIconSize.hashCode;
+      indicatorIconSize.hashCode ^
+      lastMessageAtFormatter.hashCode;
 
   @override
   void debugFillProperties(DiagnosticPropertiesBuilder properties) {
@@ -171,6 +197,8 @@ class StreamChannelPreviewThemeData with Diagnosticable {
       ..add(DiagnosticsProperty('subtitleStyle', subtitleStyle))
       ..add(DiagnosticsProperty('lastMessageAtStyle', lastMessageAtStyle))
       ..add(DiagnosticsProperty('avatarTheme', avatarTheme))
-      ..add(ColorProperty('unreadCounterColor', unreadCounterColor));
+      ..add(ColorProperty('unreadCounterColor', unreadCounterColor))
+      ..add(DiagnosticsProperty(
+          'lastMessageAtFormatter', lastMessageAtFormatter));
   }
 }

packages/stream_chat_flutter/lib/src/theme/draft_list_tile_theme.dart

@@ -1,6 +1,7 @@
 import 'package:flutter/foundation.dart';
 import 'package:flutter/widgets.dart';
 import 'package:stream_chat_flutter/src/theme/stream_chat_theme.dart';
+import 'package:stream_chat_flutter/src/utils/date_formatter.dart';
 
 /// {@template streamDraftListTileTheme}
 /// Overrides the default style of [StreamDraftListTile] descendants.
@@ -57,6 +58,7 @@ class StreamDraftListTileThemeData with Diagnosticable {
     this.draftChannelNameStyle,
     this.draftMessageStyle,
     this.draftTimestampStyle,
+    this.draftTimestampFormatter,
   });
 
   /// The padding around the [StreamDraftListTile] widget.
@@ -74,6 +76,21 @@ class StreamDraftListTileThemeData with Diagnosticable {
   /// The style of the draft timestamp in the [StreamDraftListTile] widget.
   final TextStyle? draftTimestampStyle;
 
+  /// Formatter for the draft timestamp.
+  ///
+  /// If null, uses the default date formatting.
+  ///
+  /// Example:
+  /// ```dart
+  /// StreamDraftListTileThemeData(
+  ///   draftTimestampStyle: TextStyle(...),
+  ///   draftTimestampFormatter: (context, date) {
+  ///     return Jiffy.parseFromDateTime(date).fromNow(); // "2 hours ago"
+  ///   },
+  /// )
+  /// ```
+  final DateFormatter? draftTimestampFormatter;
+
   /// A copy of [StreamDraftListTileThemeData] with specified attributes
   /// overridden.
   StreamDraftListTileThemeData copyWith({
@@ -82,6 +99,7 @@ class StreamDraftListTileThemeData with Diagnosticable {
     TextStyle? draftChannelNameStyle,
     TextStyle? draftMessageStyle,
     TextStyle? draftTimestampStyle,
+    DateFormatter? draftTimestampFormatter,
     Color? draftIconColor,
   }) =>
       StreamDraftListTileThemeData(
@@ -91,6 +109,8 @@ class StreamDraftListTileThemeData with Diagnosticable {
             draftChannelNameStyle ?? this.draftChannelNameStyle,
         draftMessageStyle: draftMessageStyle ?? this.draftMessageStyle,
         draftTimestampStyle: draftTimestampStyle ?? this.draftTimestampStyle,
+        draftTimestampFormatter:
+            draftTimestampFormatter ?? this.draftTimestampFormatter,
       );
 
   /// Merges this [StreamDraftListTileThemeData] with the [other].
@@ -104,6 +124,7 @@ class StreamDraftListTileThemeData with Diagnosticable {
       draftChannelNameStyle: other.draftChannelNameStyle,
       draftMessageStyle: other.draftMessageStyle,
       draftTimestampStyle: other.draftTimestampStyle,
+      draftTimestampFormatter: other.draftTimestampFormatter,
     );
   }
 
@@ -131,6 +152,8 @@ class StreamDraftListTileThemeData with Diagnosticable {
           b?.draftTimestampStyle,
           t,
         ),
+        draftTimestampFormatter:
+            t < 0.5 ? a?.draftTimestampFormatter : b?.draftTimestampFormatter,
       );
 
   @override
@@ -141,13 +164,15 @@ class StreamDraftListTileThemeData with Diagnosticable {
           other.backgroundColor == backgroundColor &&
           other.draftChannelNameStyle == draftChannelNameStyle &&
           other.draftMessageStyle == draftMessageStyle &&
-          other.draftTimestampStyle == draftTimestampStyle;
+          other.draftTimestampStyle == draftTimestampStyle &&
+          other.draftTimestampFormatter == draftTimestampFormatter;
 
   @override
   int get hashCode =>
       padding.hashCode ^
       backgroundColor.hashCode ^
       draftChannelNameStyle.hashCode ^
       draftMessageStyle.hashCode ^
-      draftTimestampStyle.hashCode;
+      draftTimestampStyle.hashCode ^
+      draftTimestampFormatter.hashCode;
 }