A time zones (Daylight saving time) file is a records file.
Each record is a slide of time, given in official time, with correction to apply to the official time to get UT or GMT time
Proastro only uses UT time to compute a horoscope.
To get a more concrete idea about a time zone file, edit a z?.txt file provided
with Proastro.
If you want Proastro to correct official time of the country you want to add, you must provide one or more z?.pra file generated from z?.txt files.
First of all, you must get information about the different time zones of the country and find out how many z?.txt file you will need.
Suppose you find out that the country can be divided in three parts,
each part having the same time and the same daylight time changes.
They you will create 3 z?.txt files, z1.txt, z2.txt, z3.txt.
In the lonlat.txt file, you will give for each city which zone it belongsto (1, 2 or 3).
You must then generate z?.pra from z?.txt file.
Remarks:
See also: