To update rolling window to start from first day of month and end at last day of month
Description
Today: 21 April
Current behaviour: 21 April 2017 to 20 April 2018
New behaviour: 01 April 2017 to 30 April 2018
Environment
None
Today: 21 April
Current behaviour: 21 April 2017 to 20 April 2018
New behaviour: 01 April 2017 to 30 April 2018