Note: This release is in preview. Features described here don’t become generally available until the latest general availability date that Salesforce announces for this release. Before then, and where features are noted as beta, pilot, or developer preview, we can’t guarantee general availability within any particular time frame or at all. Make your purchase decisions only on the basis of generally available products and features.
Calculate How Long Activities Take
Example: Display the Number of Days Since an Opportunity Opened
Suppose that you have an opportunity dataset with the account name and the epoch seconds fields:

You want to see how many days ago an opportunity was opened. Use daysBetween() and now(). Use toDate() to convert the order date epoch seconds to a date format that can be passed to daysBetween().
1q = load "OpsDates1";
2
3q = foreach q generate Account, daysBetween(toDate(OrderDate_sec_epoch), now()) as 'daysOpened';The resulting data stream displays the number of days since the opportunity was opened.

Example - How Many Weeks Did Each Opportunity Take to Close?
Use date_diff() with datepart = week to calculate how long, in weeks, it took to close each opportunity.
1q = load "DTC_Opportunity";
2q = foreach q generate date_diff("week", toDate(CreatedDate_sec_epoch), toDate(CloseDate_sec_epoch) ) as 'Weeks to Close';
3q = order q by 'Weeks to Close';