feat(library): Add customizable date format option for Library and History

src/library/basetracktablemodel.cpp

@@ -115,6 +115,13 @@ void BaseTrackTableModel::setApplyPlayedTrackColor(bool apply) {
     s_bApplyPlayedTrackColor = apply;
 }
 
+const QString BaseTrackTableModel::kDateFormatDefault = QString();
+QString BaseTrackTableModel::s_dateFormat = BaseTrackTableModel::kDateFormatDefault;
+
+void BaseTrackTableModel::setDateFormat(const QString& format) {
+    s_dateFormat = format;
+}
+
 BaseTrackTableModel::BaseTrackTableModel(
         QObject* parent,
         TrackCollectionManager* pTrackCollectionManager,
@@ -689,10 +696,10 @@ QVariant BaseTrackTableModel::roleValue(
             if (field == ColumnCache::COLUMN_PLAYLISTTRACKSTABLE_DATETIMEADDED) {
                 // Timestamp column in history feature:
                 // Use localized date/time format without text: "5/20/98 03:40 AM"
-                return mixxx::displayLocalDateTime(dt);
+                return mixxx::displayLocalDateTime(dt, s_dateFormat);
             }
             // For Date Added, use just the date: "5/20/98"
-            return dt.date();
+            return mixxx::formatDate(dt.date(), s_dateFormat);
         }
         case ColumnCache::COLUMN_LIBRARYTABLE_LAST_PLAYED_AT: {
             QDateTime lastPlayedAt;
@@ -718,7 +725,7 @@ QVariant BaseTrackTableModel::roleValue(
             if (role == Qt::ToolTipRole || role == kDataExportRole) {
                 return dt;
             }
-            return dt.date();
+            return mixxx::formatDate(dt.date(), s_dateFormat);
         }
         case ColumnCache::COLUMN_LIBRARYTABLE_BPM: {
             mixxx::Bpm bpm;

src/library/basetracktablemodel.h

@@ -9,6 +9,7 @@
 #include "library/trackmodel.h"
 #include "track/track_decl.h"
 #include "util/color/colorpalette.h"
+#include "util/datetime.h"
 
 class TrackCollectionManager;
 
@@ -132,6 +133,18 @@ class BaseTrackTableModel : public QAbstractTableModel, public TrackModel {
     static constexpr bool kApplyPlayedTrackColorDefault = true;
     static void setApplyPlayedTrackColor(bool apply);
 
+    enum class DateFormat {
+        Native = 0,        // System Default
+        ISO8601 = 1,       // yyyy-MM-dd
+        RegionalShort = 2, // d/M/yy
+        RegionalLong = 3,  // dd.MM.yyyy
+        Custom = 4,
+    };
+    Q_ENUM(DateFormat)
+
+    static const QString kDateFormatDefault;
+    static void setDateFormat(const QString& format);
+
   protected:
     // Build a map from the column names to their indices
     // used by fieldIndex().
@@ -307,4 +320,5 @@ class BaseTrackTableModel : public QAbstractTableModel, public TrackModel {
     static std::optional<ColorPalette> s_keyColorPalette;
 
     static bool s_bApplyPlayedTrackColor;
+    static QString s_dateFormat;
 };

src/library/library_prefs.cpp

@@ -114,3 +114,8 @@ const ConfigKey mixxx::library::prefs::kTagFetcherApplyCoverConfigKey =
         ConfigKey{
                 mixxx::library::prefs::kConfigGroup,
                 QStringLiteral("TagFetcherApplyCover")};
+
+const ConfigKey mixxx::library::prefs::kDateFormatConfigKey =
+        ConfigKey{
+                mixxx::library::prefs::kConfigGroup,
+                QStringLiteral("DateFormat")};

src/library/library_prefs.h

@@ -58,6 +58,8 @@ extern const ConfigKey kTagFetcherApplyTagsConfigKey;
 
 extern const ConfigKey kTagFetcherApplyCoverConfigKey;
 
+extern const ConfigKey kDateFormatConfigKey;
+
 } // namespace prefs
 
 } // namespace library