TimeZoneInfo.HasIanaId returning false for an IANA timezone on Linux

[roji]

Running on Ubuntu 21.04, dotnet SDK 6.0.100-rc.1.21379.2, TimeZoneInfo.HasIanaId is unexpectedly returning false.

System timezone information:

> timedatectl
               Local time: Sun 2021-08-29 11:03:06 CEST
           Universal time: Sun 2021-08-29 09:03:06 UTC
                 RTC time: Sun 2021-08-29 09:03:06
                Time zone: Europe/Berlin (CEST, +0200)
System clock synchronized: yes
              NTP service: active
          RTC in local TZ: no

Based on the sample GetIanaTimeZoneId method in this blog article:

Console.WriteLine(TimeZoneInfo.Local); // (UTC+01:00) Central European Time (Berlin)
Console.WriteLine(TimeZoneInfo.Local.Id); // Europe/Berlin
Console.WriteLine(TimeZoneInfo.Local.HasIanaId); // false

if (!TimeZoneInfo.TryConvertWindowsIdToIanaId(TimeZoneInfo.Local.Id, out _))
    Console.WriteLine($"Could not convert '{TimeZoneInfo.Local.Id}'"); // Could not convert 'Europe/Berlin'

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Issue Details

---

Running on Ubuntu 21.04, dotnet SDK 6.0.100-rc.1.21379.2, TimeZoneInfo.HasIanaId is unexpectedly returning false.

System timezone information:

> timedatectl
               Local time: Sun 2021-08-29 11:03:06 CEST
           Universal time: Sun 2021-08-29 09:03:06 UTC
                 RTC time: Sun 2021-08-29 09:03:06
                Time zone: Europe/Berlin (CEST, +0200)
System clock synchronized: yes
              NTP service: active
          RTC in local TZ: no

Based on the sample GetIanaTimeZoneId method in this blog article:

Console.WriteLine(TimeZoneInfo.Local); // (UTC+01:00) Central European Time (Berlin)
Console.WriteLine(TimeZoneInfo.Local.Id); // Europe/Berlin
Console.WriteLine(TimeZoneInfo.Local.HasIanaId); // false

if (!TimeZoneInfo.TryConvertWindowsIdToIanaId(TimeZoneInfo.Local.Id, out _))
    Console.WriteLine($"Could not convert '{TimeZoneInfo.Local.Id}'"); // Could not convert 'Europe/Berlin'

Author:	roji
Assignees:	-
Labels:	area-System.Globalization, untriaged
Milestone:	-

[ghost]

Tagging subscribers to this area: @dotnet/area-system-runtime
See info in area-owners.md if you want to be subscribed.

Issue Details

---

Running on Ubuntu 21.04, dotnet SDK 6.0.100-rc.1.21379.2, TimeZoneInfo.HasIanaId is unexpectedly returning false.

System timezone information:

> timedatectl
               Local time: Sun 2021-08-29 11:03:06 CEST
           Universal time: Sun 2021-08-29 09:03:06 UTC
                 RTC time: Sun 2021-08-29 09:03:06
                Time zone: Europe/Berlin (CEST, +0200)
System clock synchronized: yes
              NTP service: active
          RTC in local TZ: no

Based on the sample GetIanaTimeZoneId method in this blog article:

Console.WriteLine(TimeZoneInfo.Local); // (UTC+01:00) Central European Time (Berlin)
Console.WriteLine(TimeZoneInfo.Local.Id); // Europe/Berlin
Console.WriteLine(TimeZoneInfo.Local.HasIanaId); // false

if (!TimeZoneInfo.TryConvertWindowsIdToIanaId(TimeZoneInfo.Local.Id, out _))
    Console.WriteLine($"Could not convert '{TimeZoneInfo.Local.Id}'"); // Could not convert 'Europe/Berlin'

Author:	roji
Assignees:	-
Labels:	area-System.Runtime
Milestone:	-

[tarekgh]

Fixed through #58414

@roji thanks for reporting this issue. I hope when you'll have a chance to try the fix. Let me know if there is anything I can help with.

[roji]

Thanks for the quick turnaround @tarekgh, happy this got fixed for 6.0! Will let you know if I run into anything else.