diff --git a/CHANGELOG.md b/CHANGELOG.md
index 21a151f98..8123fe8cd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,13 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ## [Unreleased]
+### Added
+- Channel stream selector: add zero-based culture-specific `day_of_week` to `content_condition`, for example:
+  - en-US can match sunday using `day_of_week = 0`
+  - fr-FR can match sunday using `day_of_week = 6`
+  - As a complete example, to match Saturday from 9pm (inclusive) to 11pm (exclusive), based on content start time
+    - `content_condition: day_of_week = 6 and (time_of_day_seconds >= 75600 and time_of_day_seconds < 82800)`
+
 ### Fixed
 - Use code signing on all Windows executables (`ErsatzTV-Windows.exe`, `ErsatzTV.exe`, `ErsatzTV.Scanner.exe`)
 - Respect `z_index` (draw order) on all graphics element types
diff --git a/ErsatzTV.Core.Tests/FFmpeg/CustomStreamSelectorTests.cs b/ErsatzTV.Core.Tests/FFmpeg/CustomStreamSelectorTests.cs
index dc58bc84e..4632a2f75 100644
--- a/ErsatzTV.Core.Tests/FFmpeg/CustomStreamSelectorTests.cs
+++ b/ErsatzTV.Core.Tests/FFmpeg/CustomStreamSelectorTests.cs
@@ -7,6 +7,7 @@ using NUnit.Framework;
 using Serilog;
 using Shouldly;
 using Testably.Abstractions.Testing;
+using TimeZoneConverter;
 
 namespace ErsatzTV.Core.Tests.FFmpeg;
 
@@ -569,6 +570,289 @@ public class CustomStreamSelectorTests
             }
         }
 
+        [Test]
+        public async Task Should_Select_English_Audio_No_Subtitles_Day_Of_Week_Content_Condition_Fail()
+        {
+            const string YAML =
+                """
+                ---
+                items:
+                  - audio_language: ["ja"]
+                    subtitle_language: ["eng"]
+                    content_condition: "day_of_week = 1"
+
+                  - audio_language: ["eng"]
+                    disable_subtitles: true
+                """;
+
+            var fileSystem = new MockFileSystem();
+            fileSystem.Initialize()
+                .WithFile(TestFileName).Which(f => f.HasStringContent(YAML));
+            var streamSelector = new CustomStreamSelector(fileSystem, _logger);
+
+            var tz = TZConvert.GetTimeZoneInfo("America/Chicago");
+            var start = new DateTime(2026, 1, 11, 0, 0, 0, DateTimeKind.Unspecified); // sunday
+            var dto = new DateTimeOffset(start, tz.GetUtcOffset(start));
+
+            StreamSelectorResult result = await streamSelector.SelectStreams(_channel, dto, _audioVersion, _subtitles);
+
+            result.AudioStream.IsSome.ShouldBeTrue();
+
+            foreach (MediaStream audioStream in result.AudioStream)
+            {
+                audioStream.Index.ShouldBe(1);
+                audioStream.Language.ShouldBe("eng");
+            }
+
+            result.Subtitle.IsSome.ShouldBeFalse();
+        }
+
+        [Test]
+        public async Task Should_Select_English_Audio_No_Subtitles_Day_Of_Week_Content_Condition_Match()
+        {
+            const string YAML =
+                """
+                ---
+                items:
+                  - audio_language: ["ja"]
+                    subtitle_language: ["eng"]
+                    content_condition: "day_of_week = 0"
+
+                  - audio_language: ["eng"]
+                    disable_subtitles: true
+                """;
+
+            var fileSystem = new MockFileSystem();
+            fileSystem.Initialize()
+                .WithFile(TestFileName).Which(f => f.HasStringContent(YAML));
+            var streamSelector = new CustomStreamSelector(fileSystem, _logger);
+
+            var tz = TZConvert.GetTimeZoneInfo("America/Chicago");
+            var start = new DateTime(2026, 1, 11, 0, 0, 0, DateTimeKind.Unspecified); // sunday
+            var dto = new DateTimeOffset(start, tz.GetUtcOffset(start));
+
+            StreamSelectorResult result = await streamSelector.SelectStreams(_channel, dto, _audioVersion, _subtitles);
+
+            result.AudioStream.IsSome.ShouldBeTrue();
+
+            foreach (MediaStream audioStream in result.AudioStream)
+            {
+                audioStream.Index.ShouldBe(0);
+                audioStream.Language.ShouldBe("ja");
+            }
+
+            result.Subtitle.IsSome.ShouldBeTrue();
+
+            foreach (Subtitle subtitle in result.Subtitle)
+            {
+                subtitle.Id.ShouldBe(2);
+                subtitle.Language.ShouldBe("eng");
+            }
+        }
+
+        [Test]
+        public async Task Should_Select_English_Audio_No_Subtitles_Day_Of_Week_Time_Of_Day_Content_Condition_Fail_Before()
+        {
+            // saturday from 9pm-11pm
+            const string YAML =
+                """
+                ---
+                items:
+                  - audio_language: ["ja"]
+                    subtitle_language: ["eng"]
+                    content_condition: "day_of_week = 6 and (time_of_day_seconds >= 75600 and time_of_day_seconds < 82800)"
+
+                  - audio_language: ["eng"]
+                    disable_subtitles: true
+                """;
+
+            var fileSystem = new MockFileSystem();
+            fileSystem.Initialize()
+                .WithFile(TestFileName).Which(f => f.HasStringContent(YAML));
+            var streamSelector = new CustomStreamSelector(fileSystem, _logger);
+
+            var tz = TZConvert.GetTimeZoneInfo("America/Chicago");
+            var start = new DateTime(2026, 1, 10, 20, 59, 59, DateTimeKind.Unspecified); // saturday at 8:59:59pm
+            var dto = new DateTimeOffset(start, tz.GetUtcOffset(start));
+
+            StreamSelectorResult result = await streamSelector.SelectStreams(_channel, dto, _audioVersion, _subtitles);
+
+            result.AudioStream.IsSome.ShouldBeTrue();
+
+            foreach (MediaStream audioStream in result.AudioStream)
+            {
+                audioStream.Index.ShouldBe(1);
+                audioStream.Language.ShouldBe("eng");
+            }
+
+            result.Subtitle.IsSome.ShouldBeFalse();
+        }
+
+        [Test]
+        public async Task Should_Select_English_Audio_No_Subtitles_Day_Of_Week_Time_Of_Day_Content_Condition_Fail_After()
+        {
+            // saturday from 9pm-11pm
+            const string YAML =
+                """
+                ---
+                items:
+                  - audio_language: ["ja"]
+                    subtitle_language: ["eng"]
+                    content_condition: "day_of_week = 6 and (time_of_day_seconds >= 75600 and time_of_day_seconds < 82800)"
+
+                  - audio_language: ["eng"]
+                    disable_subtitles: true
+                """;
+
+            var fileSystem = new MockFileSystem();
+            fileSystem.Initialize()
+                .WithFile(TestFileName).Which(f => f.HasStringContent(YAML));
+            var streamSelector = new CustomStreamSelector(fileSystem, _logger);
+
+            var tz = TZConvert.GetTimeZoneInfo("America/Chicago");
+            var start = new DateTime(2026, 1, 10, 23, 0, 0, DateTimeKind.Unspecified); // saturday at 11:00pm
+            var dto = new DateTimeOffset(start, tz.GetUtcOffset(start));
+
+            StreamSelectorResult result = await streamSelector.SelectStreams(_channel, dto, _audioVersion, _subtitles);
+
+            result.AudioStream.IsSome.ShouldBeTrue();
+
+            foreach (MediaStream audioStream in result.AudioStream)
+            {
+                audioStream.Index.ShouldBe(1);
+                audioStream.Language.ShouldBe("eng");
+            }
+
+            result.Subtitle.IsSome.ShouldBeFalse();
+        }
+
+        [Test]
+        public async Task Should_Select_English_Audio_No_Subtitles_Day_Of_Week_Time_Of_Day_Content_Condition_Fail_Wrong_Day()
+        {
+            // saturday from 9pm-11pm
+            const string YAML =
+                """
+                ---
+                items:
+                  - audio_language: ["ja"]
+                    subtitle_language: ["eng"]
+                    content_condition: "day_of_week = 6 and (time_of_day_seconds >= 75600 and time_of_day_seconds < 82800)"
+
+                  - audio_language: ["eng"]
+                    disable_subtitles: true
+                """;
+
+            var fileSystem = new MockFileSystem();
+            fileSystem.Initialize()
+                .WithFile(TestFileName).Which(f => f.HasStringContent(YAML));
+            var streamSelector = new CustomStreamSelector(fileSystem, _logger);
+
+            var tz = TZConvert.GetTimeZoneInfo("America/Chicago");
+            var start = new DateTime(2026, 1, 11, 22, 0, 0, DateTimeKind.Unspecified); // sunday at 10:00pm
+            var dto = new DateTimeOffset(start, tz.GetUtcOffset(start));
+
+            StreamSelectorResult result = await streamSelector.SelectStreams(_channel, dto, _audioVersion, _subtitles);
+
+            result.AudioStream.IsSome.ShouldBeTrue();
+
+            foreach (MediaStream audioStream in result.AudioStream)
+            {
+                audioStream.Index.ShouldBe(1);
+                audioStream.Language.ShouldBe("eng");
+            }
+
+            result.Subtitle.IsSome.ShouldBeFalse();
+        }
+
+        [Test]
+        public async Task Should_Select_English_Audio_No_Subtitles_Day_Of_Week_Time_Of_Day_Content_Condition_Match()
+        {
+            // saturday from 9pm-11pm
+            const string YAML =
+                """
+                ---
+                items:
+                  - audio_language: ["ja"]
+                    subtitle_language: ["eng"]
+                    content_condition: "day_of_week = 6 and (time_of_day_seconds >= 75600 and time_of_day_seconds < 82800)"
+
+                  - audio_language: ["eng"]
+                    disable_subtitles: true
+                """;
+
+            var fileSystem = new MockFileSystem();
+            fileSystem.Initialize()
+                .WithFile(TestFileName).Which(f => f.HasStringContent(YAML));
+            var streamSelector = new CustomStreamSelector(fileSystem, _logger);
+
+            var tz = TZConvert.GetTimeZoneInfo("America/Chicago");
+            var start = new DateTime(2026, 1, 10, 22, 0, 0, DateTimeKind.Unspecified); // saturday at 10:00pm
+            var dto = new DateTimeOffset(start, tz.GetUtcOffset(start));
+
+            StreamSelectorResult result = await streamSelector.SelectStreams(_channel, dto, _audioVersion, _subtitles);
+
+            result.AudioStream.IsSome.ShouldBeTrue();
+
+            foreach (MediaStream audioStream in result.AudioStream)
+            {
+                audioStream.Index.ShouldBe(0);
+                audioStream.Language.ShouldBe("ja");
+            }
+
+            result.Subtitle.IsSome.ShouldBeTrue();
+
+            foreach (Subtitle subtitle in result.Subtitle)
+            {
+                subtitle.Id.ShouldBe(2);
+                subtitle.Language.ShouldBe("eng");
+            }
+        }
+
+        [Test]
+        [SetCulture("fr-FR")]
+        public async Task Should_Select_English_Audio_No_Subtitles_Day_Of_Week_Time_Of_Day_Content_Condition_Match_France()
+        {
+            // saturday from 9pm-11pm
+            const string YAML =
+                """
+                ---
+                items:
+                  - audio_language: ["ja"]
+                    subtitle_language: ["eng"]
+                    content_condition: "day_of_week = 5 and (time_of_day_seconds >= 75600 and time_of_day_seconds < 82800)"
+
+                  - audio_language: ["eng"]
+                    disable_subtitles: true
+                """;
+
+            var fileSystem = new MockFileSystem();
+            fileSystem.Initialize()
+                .WithFile(TestFileName).Which(f => f.HasStringContent(YAML));
+            var streamSelector = new CustomStreamSelector(fileSystem, _logger);
+
+            var tz = TZConvert.GetTimeZoneInfo("America/Chicago");
+            var start = new DateTime(2026, 1, 10, 22, 0, 0, DateTimeKind.Unspecified); // saturday at 10:00pm
+            var dto = new DateTimeOffset(start, tz.GetUtcOffset(start));
+
+            StreamSelectorResult result = await streamSelector.SelectStreams(_channel, dto, _audioVersion, _subtitles);
+
+            result.AudioStream.IsSome.ShouldBeTrue();
+
+            foreach (MediaStream audioStream in result.AudioStream)
+            {
+                audioStream.Index.ShouldBe(0);
+                audioStream.Language.ShouldBe("ja");
+            }
+
+            result.Subtitle.IsSome.ShouldBeTrue();
+
+            foreach (Subtitle subtitle in result.Subtitle)
+            {
+                subtitle.Id.ShouldBe(2);
+                subtitle.Language.ShouldBe("eng");
+            }
+        }
+
         [Test]
         public async Task Should_Ignore_Blocked_Audio_Title()
         {
diff --git a/ErsatzTV.Core/FFmpeg/CustomStreamSelector.cs b/ErsatzTV.Core/FFmpeg/CustomStreamSelector.cs
index 150d183f3..276ed4956 100644
--- a/ErsatzTV.Core/FFmpeg/CustomStreamSelector.cs
+++ b/ErsatzTV.Core/FFmpeg/CustomStreamSelector.cs
@@ -1,3 +1,4 @@
+using System.Globalization;
 using System.IO.Abstractions;
 using System.IO.Enumeration;
 using ErsatzTV.Core.Domain;
@@ -316,6 +317,7 @@ public class CustomStreamSelector(IFileSystem fileSystem, ILogger<CustomStreamSe
                 "channel_number" => channel.Number,
                 "channel_name" => channel.Name,
                 "time_of_day_seconds" => contentStartTime.LocalDateTime.TimeOfDay.TotalSeconds,
+                "day_of_week" => GetLocalizedDayOfWeekIndex(contentStartTime),
                 _ => e.Result
             };
         };
@@ -341,4 +343,11 @@ public class CustomStreamSelector(IFileSystem fileSystem, ILogger<CustomStreamSe
             throw;
         }
     }
+
+    private static int GetLocalizedDayOfWeekIndex(DateTimeOffset date)
+    {
+        DayOfWeek first = CultureInfo.CurrentCulture.DateTimeFormat.FirstDayOfWeek;
+        DayOfWeek current = date.DayOfWeek;
+        return ((int)current - (int)first + 7) % 7;
+    }
 }