Create a New Filter for the Activities List
By default, the Today and This Month filters are available on the Activity Report page.
To create a new filter:
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Go to Setup → Custom Code → Custom Settings.
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Click Manage next to Activity Report Filters.
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Click New to create a new filter.
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Fill in the details.
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Enter a filter name, specify its order in the filter picklist on the Activity Report page, and set the filter as active.
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Select Default Filter, if you want to use this filter by default.
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In the Filter Query field, enter the SOQL-filter.
There is a list of data formats and data literals at Help Salesforce.
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Click Save.

The setup is complete. The filter is available on the Activity Report pages.
