sahin52 opened a new issue, #1218:
URL: https://github.com/apache/lucenenet/issues/1218
### Is there an existing issue for this?
- [x] I have searched the existing issues
### Describe the bug
Lucene.Net `DateTools.DateToString` has a parameter for TimeZoneInfo. But
this parameter has ne effect.
```csharp
public static string DateToString(DateTime date, TimeZoneInfo timeZone,
DateResolution resolution)
```
### Expected Behavior
This parameter should change the returned string according to the
TimeZoneInfo
### Steps To Reproduce
- Create a C# project
- Add reference to Lucene.Net nuget package
- Add this code to the `Main` method
```csharp
using System;
using Lucene.Net.Documents;
internal class Program
{
public static void Main()
{
var hawaiianTimeZone = TimeZoneInfo.FindSystemTimeZoneById("Hawaiian
Standard Time");
Test("Local DateTime", new DateTime(2025, 11, 13, 0, 0, 0,
DateTimeKind.Local), hawaiianTimeZone);
Test("Unspecified DateTime", new DateTime(2025, 11, 13, 0, 0, 0,
DateTimeKind.Unspecified), hawaiianTimeZone);
Test("UTC DateTime", new DateTime(2025, 11, 13, 0, 0, 0,
DateTimeKind.Utc), hawaiianTimeZone);
}
private static void Test(string label, DateTime dt, TimeZoneInfo
customTimeZoneInfo)
{
Console.WriteLine($"\n=== {label} ===");
var local = DateTools.DateToString(dt, TimeZoneInfo.Local,
DateResolution.SECOND);
var utc = DateTools.DateToString(dt, TimeZoneInfo.Utc,
DateResolution.SECOND);
var custom = DateTools.DateToString(dt, customTimeZoneInfo,
DateResolution.SECOND);
Console.WriteLine($"Local: {local}");
Console.WriteLine($"UTC: {utc}");
Console.WriteLine($"Hawaiian: {custom}");
if (local == utc && utc == custom)
{
Console.WriteLine("!!! BUG: All time zones produce identical
output!");
}
else
{
Console.WriteLine("✓✓✓ Time zones produce different results");
}
}
}
```
### Exceptions (if any)
_No response_
### Lucene.NET Version
4.8.0-beta00017
### .NET Version
9.0.300
### Operating System
Windows
### Anything else?
When we look at Lucene.Net => DateTools.cs file in master branch, the
DateToString method implementation shows the problem
```csharp
public static string DateToString(DateTime date, TimeZoneInfo
timeZone, DateResolution resolution)
{
if (timeZone is null)
throw new ArgumentNullException(nameof(timeZone));
return DateToStringInternal(date, timeZone, resolution);
}
private static string DateToStringInternal(DateTime date,
TimeZoneInfo? timeZone, DateResolution resolution)
{
string? format = ToDateFormat(resolution);
if (format is null)
throw new ArgumentException($"Unknown resolution
{resolution}.");
DateTimeOffset timeZoneAdjusted = new
DateTimeOffset(date.ToUniversalTime(), TimeSpan.Zero);
if (timeZone is not null && !TimeZoneInfo.Utc.Equals(timeZone))
{
timeZoneAdjusted =
TimeZoneInfo.ConvertTime(timeZoneAdjusted, timeZone);
}
DateTime d = Round(timeZoneAdjusted.UtcDateTime, resolution);
// time zone conversion is undone
return d.ToString(format, CultureInfo.InvariantCulture);
}
```
`timeZoneAdjusted.UtcDateTime` returns the UTC time, the timezone conversion
is effectively undone.
--
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
To unsubscribe, e-mail: [email protected]
For queries about this service, please contact Infrastructure at:
[email protected]
