Use InvariantCulture when parsing machine-generated dates

DateTime.TryParse without an IFormatProvider falls back to the current
thread culture, so the same string can parse differently (or fail)
depending on the server's locale. None of these call sites deal with
user-entered text - they parse dates that come from filenames, an
HTTP header, ffprobe metadata and values the app itself wrote to the
auth database - so InvariantCulture is the correct provider everywhere
here.

Fixes the S6580 / CA1305 warnings on these call sites.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

5 files changed, 7 insertions, 6 deletions

diff --git a/Emby.Naming/TV/EpisodePathParser.cs b/Emby.Naming/TV/EpisodePathParser.cs
index 8cd5a126e0..0c737964b4 100644
--- a/Emby.Naming/TV/EpisodePathParser.cs
+++ b/Emby.Naming/TV/EpisodePathParser.cs
@@ -125,7 +125,7 @@ namespace Emby.Naming.TV
                             result.Success = true;
                         }
                     }
-                    else if (DateTime.TryParse(match.Groups[0].ValueSpan, out date))
+                    else if (DateTime.TryParse(match.Groups[0].ValueSpan, CultureInfo.InvariantCulture, out date))
                     {
                         result.Year = date.Year;
                         result.Month = date.Month;
diff --git a/Jellyfin.Api/Controllers/ImageController.cs b/Jellyfin.Api/Controllers/ImageController.cs
index ae792142b4..52d8b4dad1 100644
--- a/Jellyfin.Api/Controllers/ImageController.cs
+++ b/Jellyfin.Api/Controllers/ImageController.cs
@@ -2049,7 +2049,7 @@ public class ImageController : BaseJellyfinApiController
             }
 
             // Check If-Modified-Since header for time-based validation
-            if (DateTime.TryParse(Request.Headers[HeaderNames.IfModifiedSince], out var ifModifiedSinceHeader))
+            if (DateTime.TryParse(Request.Headers[HeaderNames.IfModifiedSince], CultureInfo.InvariantCulture, out var ifModifiedSinceHeader))
             {
                 // Return 304 if the image has not been modified since the client's cached version
                 if (dateImageModified <= ifModifiedSinceHeader)
diff --git a/Jellyfin.Server/Migrations/Routines/20250420140000_MigrateAuthenticationDb.cs b/Jellyfin.Server/Migrations/Routines/20250420140000_MigrateAuthenticationDb.cs
index 0de775e03a..cbdc6efb44 100644
--- a/Jellyfin.Server/Migrations/Routines/20250420140000_MigrateAuthenticationDb.cs
+++ b/Jellyfin.Server/Migrations/Routines/20250420140000_MigrateAuthenticationDb.cs
@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Globalization;
 using System.IO;
 using Emby.Server.Implementations.Data;
 using Jellyfin.Database.Implementations;
@@ -79,9 +80,9 @@ namespace Jellyfin.Server.Migrations.Routines
                 foreach (var row in authenticatedDevices)
                 {
                     var dateCreatedStr = row.GetString(9);
-                    _ = DateTime.TryParse(dateCreatedStr, out var dateCreated);
+                    _ = DateTime.TryParse(dateCreatedStr, CultureInfo.InvariantCulture, out var dateCreated);
                     var dateLastActivityStr = row.GetString(10);
-                    _ = DateTime.TryParse(dateLastActivityStr, out var dateLastActivity);
+                    _ = DateTime.TryParse(dateLastActivityStr, CultureInfo.InvariantCulture, out var dateLastActivity);
 
                     if (row.IsDBNull(6))
                     {
diff --git a/MediaBrowser.MediaEncoding/Probing/ProbeResultNormalizer.cs b/MediaBrowser.MediaEncoding/Probing/ProbeResultNormalizer.cs
index 0fe9db8a67..203e565ac7 100644
--- a/MediaBrowser.MediaEncoding/Probing/ProbeResultNormalizer.cs
+++ b/MediaBrowser.MediaEncoding/Probing/ProbeResultNormalizer.cs
@@ -1641,7 +1641,7 @@ namespace MediaBrowser.MediaEncoding.Probing
 
             // Credit to MCEBuddy: https://mcebuddy2x.codeplex.com/
             // DateTime is reported along with timezone info (typically Z i.e. UTC hence assume None)
-            if (tags.TryGetValue("WM/MediaOriginalBroadcastDateTime", out var premiereDateString) && DateTime.TryParse(year, null, DateTimeStyles.AdjustToUniversal, out var parsedDate))
+            if (tags.TryGetValue("WM/MediaOriginalBroadcastDateTime", out var premiereDateString) && DateTime.TryParse(year, CultureInfo.InvariantCulture, DateTimeStyles.AdjustToUniversal, out var parsedDate))
             {
                 video.PremiereDate = parsedDate;
             }
diff --git a/MediaBrowser.Providers/Books/OpenPackagingFormat/OpfReader.cs b/MediaBrowser.Providers/Books/OpenPackagingFormat/OpfReader.cs
index 15ea2ce5ab..b4e3fd3089 100644
--- a/MediaBrowser.Providers/Books/OpenPackagingFormat/OpfReader.cs
+++ b/MediaBrowser.Providers/Books/OpenPackagingFormat/OpfReader.cs
@@ -125,7 +125,7 @@ namespace MediaBrowser.Providers.Books.OpenPackagingFormat
 
             ReadStringInto("//dc:date", date =>
             {
-                if (DateTime.TryParse(date, out var dateValue))
+                if (DateTime.TryParse(date, CultureInfo.InvariantCulture, out var dateValue))
                 {
                     book.PremiereDate = dateValue.Date;
                     book.ProductionYear = dateValue.Date.Year;