spanattribute allows you to control which coverage recordings are merged to form a current coverage report. By default, Clover includes all coverage data found. You can configure it to include a different span of coverage recordings. The span attribute lets you do this.
span attribute takes an Interval which tells Clover how far back in time since the last Clover compilation that coverage recordings should be merged to build the report.
span attribute applies to the following Ant tasks or sub-elements thereof: