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Unity exposes TimeZoneInfo from the underlying .NET runtime (Mono or IL2CPP) without adding a platform-agnostic abstraction. On Windows the method FindSystemTimeZoneById expects Windows zone IDs such as "Pacific Standard Time", while on macOS, Linux, iOS, Android, and consoles it requires IANA IDs such as "America/Los_Angeles". The engine provides no API to
Developers need to convert a UTC timestamp from the past (e.g., 1995‑07‑01 12:00) to the local time of a region that has altered its daylight‑saving rules since that date. The goal is to obtain an offset that matches the historical IANA timezone database, regardless of whether the host operating system has retained those older rules. Delphi’s RTL TTimeZone.L
Since .NET 6, TimeZoneInfo.FindSystemTimeZoneById accepts IANA IDs like America/Los_Angeles on all platforms, including Windows. On Windows, however, the runtime translates the IANA ID through a built-in mapping table to a Windows time zone key, and that table is fixed at the runtime's build time. On Linux and macOS the same call resolves against the operati
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