Records 7.2 question. Is it possible to set the Record Sort order field to process data such as start time?

Records 7.2 question. Is it possible to set the Record Sort order field to process data such as start time? rf!pp.startTime is not allowed as a value:

The alias [rf!pp.startTime] cannot be used because it contains illegal characters. The alias must contain only letters, numbers, and underscores, and must start with a letter. (APNX-1-4203-009)...

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