[Toybox] date with timezone

[Rob Landley]

On 5/28/21 4:06 AM, Rob Landley wrote:
> On 5/26/21 11:17 AM, Frank Liu wrote:
>> A bit background, the TZ string actually came from the "stat":
> 
> I'm fine with it, I've seen that in mbox files and so on too.
> 
> The question I have is how I feed the information to the libc functions. Since
> setting TZ to "+1234" didn't work (nor did setting it to just 1234), I'm
> guessing I need to parse the data and assign it to "timezone" myself? Except
> doing so appears to be ignored in glibc. From a quick glace at the musl source
> it looks like it might work there?

Ok, I need to feed libc TZ="UTC+xxxx" with no space, and THEN it understands the
file format in the man page.

Except if the date is "1980-01-02" and I peel off the trailing -02 as a timezone
adjustment, it breaks. So I need to parse a comprehensible date format and THEN
peel off time zone adjustments if there's anything left over. Which means this
can't be in the parse_date() wrapper along with the TZ="" logic, this needs to
go into xparsedate(), and...

It's already in there. Sigh. Except for the part where it doesn't actually
work... because it doesn't understand the space. And it also can't handle +01 or
"... + 01 : 01 " which is 5 spaces that the gnu/dammit one can so SOMEBODY out
there is likely to have.

Did you know that trailing + or - by themselves are ignored? They don't count as
+0, the timezone is unchanged by them. Because GNU, of course.

Alright, I checked something in. Try now?

Rob