Create a Date Bucket
Click Add Control from the dashboard sidebar menu and select Date Bucket. A modal will pop up for you to customize your variable settings.
Rename the variable if desired, and select your default bucket.
Connect a Date Bucket to your chart
Once you’ve created your Date Bucket variable, open a chart you’d like to connect to your Date Bucket. You’ll need a chart grouped by a date column.
Click the date Dimension to open its settings, and open the Time Bucket dropdown. Find your DATE_BUCKET variable and select it.
Note: Quarter bucketing is not supported by Google Analytics.