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
Deskundige GIS
Gemeente Ingelmunster, Oostrozebekestraat 4, 8770 Ingelmunster
T+32 51 33 74 39www.ingelmunster.be
Raadpleeg onze disclaimer
-----Oorspronkelijk bericht-----
Van: Stefan Giese (WhereGroup) [mailto:stefan.gi...@wheregroup.com]
Verzonden: dinsdag 19 december 2017 8:58
Aan: Reginald Carlier
CC: qgis-user@lists.osgeo.org
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,
>>
>>
>>
>>
>>
>>
>> --
>> Sent from:
>> http://osgeo-org.1560.x6.nabble.com/QGIS-User-f4125267.html
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