[tz] Question about the UNTIL fields

[Marcos Passos]

Hello everyone,

I'm working on a TZDB parser for a PHP project and reading the zic8.txt I
came across with the following information:

The month, day, and time of day have the same format as the IN, ON, and AT
> fields of a rule


However, I could not find any Zone line in the latest version of the TZDB
containing relative dates, such as "lastSun" or "sun>=5", but only absolute
dates.

Is this a mistake in the documentation or are relative dates actually
supported on those lines but have never been used?

- Marcos
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