When defining a Data Source, what is the Primary Timestamp needed/used for? March 18, 2024 21:04 Updated The primary timestamp is used for charting any time series data. Related articles How to detect Marketo Emails & Domains That Use Link Scanner / Click Bot Error: Insufficient_Access_on_Cross_Reference_Entity or Insufficient_Access_on_Cross_Reference_Id Why is the date field in my Google Sheet file not importing?