If you would like to break down your Happy Birthday stats to a specific time period of your choosing, then you can do this by using the date range picker.
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From the main page within the Happy Birthday app, scroll down to find the Detailed Performance section.
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Click the date-picker located under the heading, and you can choose a preset or custom date period. Then click Apply:
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​Your stats will be displayed for this period:

​ Hover over a graph for a more detailed breakdown of that period:
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Please get in touch with support if you need any further assistance.