title: How to create a 'past 3 months' time period in Google Data Studio
body: <p>I'm trying to have my line chart show data for the past 3 months. GDS has a 'last quarter' date range, but this shows me Q1, Q2, Q3, or Q4. What I need is the data for the past 3 full months (not counting the current month). I tried creating a calculated field but the documentation isn't proving very useful for the matter at hand.</p>
  
  <p>eg. If the current date is Feb-20, I want to show data from 'Nov 1 - Jan 31'. Also need to compare to same period from last year.</p>
  
  <p>Can anyone help? Thanks in advance!</p>