Reset the date filter to last 3 months whenever the dashboard is opened using IronPython

Introduction

This script can be triggered by updating the current datetime into a document property using a simple R script. IronPython script then is attached to this document property to trigger it every time the dashboard opens.
 

from Spotfire.Dxp.Application.Filters import RangeFilter,ValueRange
from Spotfire.Dxp.Data.DataType import Date
from System import DateTime
from System.Globalization import CultureInfo

myPanel = Document.ActivePageReference.FilterPanel
# tablegroups is referring to table number 5 and it's date column
myFilter = myPanel.TableGroups[5].GetFilter("Date_column")
#print myFilter

lblFilter = myFilter.FilterReference.As[RangeFilter]()
lblFilter.Reset()
strMaxDate = lblFilter.ToString().split('=')[2][:-2]
max = Date.Formatter.Parse(strMaxDate)
min = max.AddDays(-91)
#print min
lblFilter.ValueRange=ValueRange(min,max)