Hi Reginald,
you should use Year(todate(now()) without the underscore in
to_date...but don't ask me why...
best
stefan
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Am 2017-12-19 09:14, schrieb Reginald Carlier:
Thanks Stefan,
I finally got the age by using this code:
(2017 - year(to_date("GDate")))
Year(to_date(now()) seems to fail as there are missing brackets but I
can't figure out where.
Regards,
Reginald Carlier
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-----Oorspronkelijk bericht-----
Van: Stefan Giese (WhereGroup) [mailto:[email protected]]
Verzonden: dinsdag 19 december 2017 8:58
Aan: Reginald Carlier
CC: [email protected]
Onderwerp: Re: [Qgis-user] Calculate age in years with
expressionbuilder
I forgot: and as a workaround you can use:
year(todate(now()) - year(todate("GDate")) which will produce correct
ages, or you can use your own python function (expression
builder->functions->new file):
from qgis.core import *
from qgis.gui import *
from datetime import datetime
from dateutil.relativedelta import relativedelta
@qgsfunction(args=2, group='Python')
def GetAge(values,feature,parent):
'''
call this function GetAge("fromdate","todate")
in years
'''
d1 =datetime.strptime(values[0],"%Y-%m-%d")
d2 =datetime.strptime(values[1],"%Y-%m-%d")
difference = relativedelta(d2, d1)
return difference
Am 2017-12-19 07:48, schrieb Stefan Giese (WhereGroup):
it seems, that this is a bug, see:
https://issues.qgis.org/issues/17681
best regards
Stefan
Am 2017-12-18 15:26, schrieb Reginald:
hello,
I am calculating the age of persons with the expression builder.
My formulae looks like this:
year(age( to_date(now()) , "GDate" )) The result looks alright for
people who are younger than 68 years.
People who are born in 1949 or before get negative ages and the age
goes from -68 to -31 (for someone born in 1913) What is wrong with
my
formulae?
Regards,
--
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