[Joda-interest] Do DST transtitions continue after the last year specified in tzdata rules?

[Zubin Kavarana]

For a certain timezone (Tehran), DST transitions do not continue past the year 2037, which is the last year in the tzdata for which this zone has DST information. Are DST transitions supposed to continue as a simple rule following the last year rule, or stop completely if there is no data?

I noticed the following -

1. Where tzdata has DST rules like 1996 to max (EU), the DST continues indefinitely (or at least to 100 years after compiling)
2. A comment in the class "org.joda.time.tz.DateTimeZoneBuilder", method "toDateTimeZone(String id, boolean outputID)" reads "// Tail zone picks up remaining transitions in the form of an endless DST cycle." The tailzone for the kind of zone without max given results in null (due to max not being specified in the tzdata)
3. A tailzone is built in the method "public DSTZone buildTailZone(String id)" in the class "org.joda.time.tz.DateTimeZoneBuilder", but it will only do so if the rules start year and end year are equal to max int value, else it returns null
4. JDKs (JRockit, HotSpot and IBM J9) seem to apply the last rule in 2037 further onwards for subsequent years

To summarize - I am not sure if (not) applying DST transitions past the last year specified in tzdata, where max is not given, is a bug or a design decision?

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