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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