CODEWITHSUNDEEP
c#nodatime
Don
Don

Reputation: 131

Check if local date time exist NODA TIME

Is there a way to validate the date time if it does exist?

this might sound weird but if you apply daytime saving to a certain zone for example America/New_york March 12. 2017 2am to 3am is their daylight saving time. literary speaking from March 12. 2017 2am to 2:59am it doesn't exist in their time. i wanna validate a given date time if it exist

i tried using this

given dateTime = March 12. 2017 2:30am

 var timeZoneProvider = DateTimeZoneProviders.Tzdb.GetZoneOrNull("America/New_York"); 
 var localDate = LocalDateTime.FromDateTime(dateTime);
 var result = timeZoneProvider.AtStrictly(localDate).ToDateTimeUtc();

it throws and error is there a way to validate it before using AtStrictly? that where it throws error and says the date time doesn't not exist this is due to DayLight Saving in that zone

Upvotes: 2

Views: 858

Answers (1)

Matt Johnson-Pint
Matt Johnson-Pint

Reputation: 241563

The DateTimeZone.MapLocal method can give you this information. Here are some extension methods that will make this easy. (Put them in a static class somewhere.)

public static bool IsInvalidTime(this DateTimeZone tz, LocalDateTime ldt)
{
    return tz.MapLocal(ldt).Count == 0;
}

public static bool IsAmbiguousTime(this DateTimeZone tz, LocalDateTime ldt)
{
    return tz.MapLocal(ldt).Count > 1;
}

Then you can do things like this in the spring:

var timeZone = DateTimeZoneProviders.Tzdb["America/New_York"];
var localDateTime = new LocalDateTime(2017, 3, 12, 2, 30);

if (timeZone.IsInvalidTime(localDateTime)) { ... true ... }

and in the fall:

var timeZone = DateTimeZoneProviders.Tzdb["America/New_York"];
var localDateTime = new LocalDateTime(2017, 11, 5, 1, 30);

if (timeZone.IsAmbiguousTime(localDateTime)) { ... true ... }

Of course, this assumes you just want to pre-validate. If you wanted to actually apply some conversion rules, thats where AtLeniently or ResolveLocal(... your custom rules ...) would come in.

Upvotes: 5

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