In NetSuite Analytics, is it possible to calculate minutes or hours between two date/time fields?

In a NetSuite Analytics Dataset, I'm trying to create a calculated field to display the time in minutes between two date/time fields. Nothing I've tried has worked. Is it really not possible to do this?

Here are the formulas I've tried. Some were pretty desparate attempts:

({enddatetime} - {startdatetime}) * 24 * 60

****

((CAST({enddatetime} AS DATETIME) - CAST({startdatetime} AS DATETIME)) * 24 * 60)

****

FLOOR(

  TIMESTAMPDIFF(MINUTE, {startdatetime}, {enddatetime})

)

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(UNIX_TIMESTAMP({enddatetime}) - UNIX_TIMESTAMP({startdatetime})) / 60

****

(CAST({enddatetime} AS TIMESTAMP) - CAST({startdatetime} AS TIMESTAMP)) / 60000

****

(({enddatetime} - {startdatetime}) * 24 * 60)

****

((TO_TIMESTAMP({enddatetime}) - TO_TIMESTAMP({startdatetime})) * 24 * 60)

****

(EXTRACT(EPOCH FROM ({enddatetime} - {startdatetime}))) / 60

****

DATEDIFF(MINUTE, {startdatetime}, {enddatetime})