Filter Date field based on Formula

Hi All,

Could anybody help me to filter the date field based on the below requirement,

1)User will select the End date and number of weeks like 26,52,2 year and 5 years:

Based on the above selection I need to calculate the start date and need to filter the date field based on Start date and End date.

Previously I used Parameter field to get both start date and end date then used the parameter field in report filter to filter the date field.