How to validate an IANA string with nodatime?

Question

var easternTimeZone = DateTimeZoneProviders.Tzdb[timeZoneIdentifier];

Using NodaTime how should I validate that when the string timeZoneIdentifier is set to a valid IANA string like "Europe/Stockholm" it is deemed valid but an unsupported IANA string is rejected.

https://en.wikipedia.org/wiki/List_of_tz_database_time_zones

What's the difference between an *unsupported* string and an invalid string? Just catch the `TimeZoneNotFound` exception, or try for the null reference from `GetZoneOrNull` and consider that good enough? — Anya Shenanigans, Oct 17 '15 at 20:36
Thank you for the comment, I will accept Matt Johnson's answer as it has a code sample. — Dizzle, Oct 18 '15 at 05:12

score 7 · Accepted Answer · answered Oct 18 '15 at 01:00

DateTimeZone tz = DateTimeZoneProviders.Tzdb.GetZoneOrNull(timeZoneIdentifier);
bool valid = tz != null;

Or, as an extension method:

public static bool IsValidTimeZone(this IDateTimeZoneProvider provider, string timeZoneId)
{
    return provider.GetZoneOrNull(timeZoneId) != null;
}

How to validate an IANA string with nodatime?

1 Answers1