1:54 p.m.
Dear all,
does gretl have an accessor for accessing the system's calendar date and
time? I couldn't find anything on this.
I am sure one could use some shell command within unix/linux but I would
have no idea how to grab such information on a windows of mac os machine.
Best,
Artur
2:31 p.m.
On Sat, 2 Feb 2019, Artur T. wrote:
Dear all,
does gretl have an accessor for accessing the system's calendar date and
time? I couldn't find anything on this.
I am sure one could use some shell command within unix/linux but I would have
no idea how to grab such information on a windows of mac os machine.
On Linux you can do
string s = grab("date")
and this should work on OS X too. On Windows I think that
string s = grab("date /t")
ought to work but I haven't tested it. I see that grab() never got
documented, but it retrieves the output from a shell command. You
need to enable shell access in the GUI preferences for it to work.
Allin
3:47 p.m.
Am 02.02.2019 um 15:31 schrieb Allin Cottrell:
and this should work on OS X too. On Windows I think that
string s = grab("date /t")
ought to work but I haven't tested it. I see that grab() never got
documented, but it retrieves the output from a shell command.
Interesting.
I just tried the following on Windows 10:
? eval grab("echo %date%")
02.02.2019
So the format is locale-dependent, which could be a problem (same for
"date /t" or %time%).
Another solution on Windows might be this:
? eval grab("powershell get-date -format T")
16:41:36
? eval grab("powershell get-date -format t")
16:42
? eval grab("powershell get-date -format s")
2019-02-02T16:43:03
? eval grab("powershell get-date -format u")
2019-02-02 16:44:26Z
The last two are oriented at ISO 8601.
Powershell should be available on up-to-date patched Windows systems I
think.
cheers,
sven
4:01 p.m.
Am 02.02.19 um 16:47 schrieb Sven Schreiber:
Am 02.02.2019 um 15:31 schrieb Allin Cottrell:
> and this should work on OS X too. On Windows I think that
>
> string s = grab("date /t")
>
> ought to work but I haven't tested it. I see that grab() never got
> documented, but it retrieves the output from a shell command.
Interesting.
Indeed! Thanks for this information, Allin.
I've just tried on ubuntu
<eval grab("date --date='today' +'%d/%m/%Y'")>
which works fine!
Artur
10:55 a.m.
On Sat, 2 Feb 2019, Artur T. wrote:
Am 02.02.19 um 16:47 schrieb Sven Schreiber:
> Am 02.02.2019 um 15:31 schrieb Allin Cottrell:
>
>
>> and this should work on OS X too. On Windows I think that
>>
>> string s = grab("date /t")
>>
>> ought to work but I haven't tested it. I see that grab() never got
>> documented, but it retrieves the output from a shell command.
>
> Interesting.
Indeed! Thanks for this information, Allin.
I've just tried on ubuntu
<eval grab("date --date='today' +'%d/%m/%Y'")>
which works fine!
I've just added to the git version a "$now" accessor that should simplify
things a bit; example:
<hansl>
set verbose off
x = $now
printf "%20.12f\n\n", x
yr = floor(x/10000)
x -= yr*10000
mth = floor(x/100)
x -= mth*100
day = floor(x)
x -= day
printf "Today is %d/%d/%d\n", day, mth, yr+2000
</hansl>
produces
<output>
190207.495601851871
Today is 7/2/2019
</output>
Allin, feel free to scrap it if you want!
-------------------------------------------------------
Riccardo (Jack) Lucchetti
Dipartimento di Scienze Economiche e Sociali (DiSES)
Università Politecnica delle Marche
(formerly known as Università di Ancona)
r.lucchetti(a)univpm.it
http://www2.econ.univpm.it/servizi/hpp/lucchetti
-------------------------------------------------------
12:56 p.m.
Am 07.02.2019 um 11:55 schrieb Riccardo (Jack) Lucchetti:
I've just added to the git version a "$now" accessor
that should
simplify things a bit; example:
In principle, that's great, thanks!
However, from the luxury-seeking point of view of a user I think it
would be good if the date were returned in an ISO format like the one we
have for $obsminor etc.
What about a $datetime accessor which returns a 2-elem vector, first
element the current ISO date and the second element the current (local)
time in some other standardized format?
cheers,
sven
1:40 p.m.
On Thu, 7 Feb 2019, Riccardo (Jack) Lucchetti wrote:
On Sat, 2 Feb 2019, Artur T. wrote:
> Am 02.02.19 um 16:47 schrieb Sven Schreiber:
>> Am 02.02.2019 um 15:31 schrieb Allin Cottrell:
>>
>>
>>> and this should work on OS X too. On Windows I think that
>>>
>>> string s = grab("date /t")
>>>
>>> ought to work but I haven't tested it. I see that grab() never got
>>> documented, but it retrieves the output from a shell command.
>>
>> Interesting.
>
> Indeed! Thanks for this information, Allin.
>
> I've just tried on ubuntu
> <eval grab("date --date='today' +'%d/%m/%Y'")>
> which works fine!
I've just added to the git version a "$now" accessor that should simplify
things a bit; example:
<hansl>
set verbose off
x = $now
printf "%20.12f\n\n", x
yr = floor(x/10000)
x -= yr*10000
mth = floor(x/100)
x -= mth*100
day = floor(x)
x -= day
printf "Today is %d/%d/%d\n", day, mth, yr+2000
</hansl>
produces
<output>
190207.495601851871
Today is 7/2/2019
</output>
Allin, feel free to scrap it if you want!
No, I was thinking of something along those lines myself. But I wonder
if it might be more user-friendly to return a vector holding year,
month, day, hour, minute, second. I guess it would be good to know
what use people are likely to make of this facility.
Allin
2:10 p.m.
On Thu, 7 Feb 2019, Allin Cottrell wrote:
No, I was thinking of something along those lines myself. But
I wonder if it might be more user-friendly to return a vector
holding year, month, day, hour, minute, second. I guess it
would be good to know what use people are likely to make of
this facility.
I had thought about that too, but eventually I decided to go for something
you can base a simple inequality on, as in
if $now > 20191231
but of course I don't have strong preferences.
-------------------------------------------------------
Riccardo (Jack) Lucchetti
Dipartimento di Scienze Economiche e Sociali (DiSES)
Università Politecnica delle Marche
(formerly known as Università di Ancona)
r.lucchetti(a)univpm.it
http://www2.econ.univpm.it/servizi/hpp/lucchetti
-------------------------------------------------------
2:21 p.m.
On Thu, 7 Feb 2019, Riccardo (Jack) Lucchetti wrote:
On Thu, 7 Feb 2019, Allin Cottrell wrote:
>
> No, I was thinking of something along those lines myself. But I wonder if
> it might be more user-friendly to return a vector holding year, month, day,
> hour, minute, second. I guess it would be good to know what use people are
> likely to make of this facility.
I had thought about that too, but eventually I decided to go for something
you can base a simple inequality on, as in
if $now > 20191231
but of course I don't have strong preferences.
For that purpose I think it might be nice to return a 2-vector holding
time_t and epoch day. Then
if $now[1] > n
would have one-second resolution and
if $now[2] > n
would have one-day resolution, and now[2] could be passed directly to
isodate() or juldate().
Allin
7:32 a.m.
Am 07.02.19 um 14:40 schrieb Allin Cottrell:
I guess it would be good to know what
use people are likely to make of this facility.
Hi Allin and Jack,
thank you for the effort on this topic. The application I had in mind is
a simple one:
A machine starts a daily cron-job, and needs to determine today's date
or the exact time for accessing the right rows in some database when
getting data before setting the period automatically which shall be
forecasted.
Best,
Artur
2:02 p.m.
On Fri, 8 Feb 2019, Artur T. wrote:
Am 07.02.19 um 14:40 schrieb Allin Cottrell:
> I guess it would be good to know what use people are likely to make of this
> facility.
Hi Allin and Jack,
thank you for the effort on this topic. The application I had in mind is a
simple one:
A machine starts a daily cron-job, and needs to determine today's date or the
exact time for accessing the right rows in some database when getting data
before setting the period automatically which shall be forecasted.
OK, that should be eminently doable via $now. Pending proper
documentation I'll just say that the $now[1] element can be put into
whatever time/date form you like via strftime(). Or the $now[2]
element, if you just need resolution to the day rather than the
second.
Jointly, the complementary functions strptime and strftime enable
round-tripping between time/date in pretty much any input format and
just about any output format.
Allin
2149
days inactive
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10 comments
4 participants
participants (4)
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Allin Cottrell -
Artur T. -
Riccardo (Jack) Lucchetti -
Sven Schreiber