I've been adding DST time zone to espurna (https://github.com/xoseperez/espurna/pull/1295).

All dst entries but asia/tehran, use Mm.n.d format to specify dst dates. 

The Tehran use 'Jn': "Asia/Tehran","<+0330>-3:30<+0430>,J80/0,J264/0"

When I implement this 'J' format, I came out a day short.

From https://en.wikipedia.org/wiki/Iran_Standard_Time:

The Iranian DST starts on March 22 and ends on September 22 each year with the exception of leapyears in which the DST starts and ends one day prior.

Year	DST Start Date and Time	DST End Date and Time
2014	Sat, Mar 22, 0:00 AM	Mon, Sep 22, 0:00 AM
2015	Sun, Mar 22, 0:00 AM	Tue, Sep 22, 0:00 AM
2016	Mon, Mar 21, 0:00 AM	Wed, Sep 21, 0:00 AM
2017	Wed, Mar 22, 0:00 AM	Fri, Sep 22, 0:00 AM
2018	Thu, Mar 22, 0:00 AM	Sat, Sep 22, 0:00 AM

This mean Tehran should be "Asia/Tehran","<+0330>-3:30<+0430>,80/0,264/0". The 'n' format, which counts 29 Feb, and starts count from 0, so would not come up a day short on non-leap years.