Fix #8

[kurahaupo]

Fix logic error

[kurahaupo]

Fixed #8

[kurahaupo]

And... nope!

Commit 247cbeb fixes TZ=America/Iqaluit, changing

• EST5EDT,M3.2.0/3,M11.1.0 (incorrect) to
• EST5EDT,M3.2.0,M11.1.0 (correct).

But unfortunately it breaks TZ=Pacific/Auckland, changing

• NZST-12NZDT,M9.5.0,M4.1.0/3 (correct) to
• NZST-12NZDT,M9.5.0/3,M4.1.0/3 (incorrect).

I will need to investigate why, including whether the code copes with DST at the start and end of the year, rather than in the middle of the year.

[kurahaupo]

The logic when constructing the TZ string is to search the list of transitions for the next two transitions. That's why the current time matters.

The problem isn't specifically whether you're "currently in DST" but whether you're in the middle of the year (so the next two transitions are in different years) or around the start or end of the year (so the next two transitions are in the same year).