Re: os.time() modifies the argument

[Nicola Fontana <ntd@...>]

Il Sat, 28 Jan 2017 10:56:49 +0300 Egor Skriptunoff <egor.skriptunoff@gmail.com> scrisse:

> > the `isdst` field was forcibly overridden: it was
> > explicitly set to false, but the call to os.time ignored that and
> > changed it to true anyway.
> >  
> 
> "isdst" is not an independent parameter.
> It could not be set to whatever user wants.
> "isdst" is calculated based on the date and the location (your time zone).
> This is similar to how "wday" is calculated as function of the date.

I disagree on this: isdst is an input parameter for os.time() and
I set it to false because I explicitely want the time without the
daylight saving correction. This works:

$ lua
Lua 5.3.3  Copyright (C) 1994-2016 Lua.org, PUC-Rio
> os.time { year=2016, month=6, day=20, isdst=false }
1466420400
> os.time { year=2016, month=6, day=20, isdst=true }
1466416800

That said, I found an old post of LHF where was said that isdst is
a tribool: true/false/nil. What you are describing is the behavior
when isdst is nil.

Ciao.
-- 
Nicola