When using the variable {lastdate}, what does the operation {lastdate} + 90 yield?

The operation {lastdate} + 90 yields a new date that is 90 days into the future because adding a number to a date in NetSuite's system is interpreted as adding that many days to the given date. In this context, {lastdate} represents a specific date value. When performing this calculation, the system is programmed to understand that the addition of 90 refers to a duration in days, effectively moving the date 90 days ahead from the value contained in {lastdate}.

This behavior is a key feature of date handling within NetSuite, allowing users to perform date arithmetic seamlessly. It enhances functionality in reports and saved searches, where you might need to evaluate future dates based on existing ones.