TOC
Summary
How do I specify the timezone ID in .NET Core v3.1?
In macOS v11.6, the Time Zone Database is within the /usr/share/zoneinfo directory.
$ file /usr/share/zoneinfo/Asia/Tokyo
/usr/share/zoneinfo/Asia/Tokyo: timezone data, version 2, 3 gmt time flags, 3 std time flags, no leap seconds, 8 transition times, 3 abbreviation charsTherefore, when specifying the time zone id in Swift, do as follows. It’s the same for macOS and iOS.
let timezone = TimeZone(identifier: "Asia/Tokyo")On the other hand, in .NET Core v3.1 (Windows), specify as follows.
System.TimeZoneInfo.FindSystemTimeZoneById("Tokyo Standard Time");If you use Tokyo Standard Time in macOS or iOS, it occurs System.TimeZoneNotFoundException. But Asia/Tokyo occurs the same exception on Windows.
Prerequisites
- .NET Core v3.1
- macOS v11.6
- Windows 10 v21H1
Steps
Workaround 1: Branching with OS platform.
Example is here:
string timeZoneId = "Tokyo Standard Time"; // For Windows
if (RuntimeInformation.IsOSPlatform(OSPlatform.OSX))
{
// If you are using the code on Linux, consider branching with OSPlatform.Linux.
timeZoneId = "Asia/Tokyo";
}
var utcTime = DateTime.UtcNow;
TimeZoneInfo jstTimeZone = TimeZoneInfo.FindSystemTimeZoneById(timeZoneId);
DateTime jstTime = TimeZoneInfo.ConvertTimeFromUtc(utcTime, jstTimeZone);
Console.WriteLine($"UTC - Date {utcTime}");
Console.WriteLine($"JST - Date {jstTime} TimeZoneId {timeZoneId}");Workaround 2: Using the TimeZoneConverter package
See the info:
