readTime property

Read timestamp this batch was returned from.

This applies to the range of results from the query's start_cursor (or the beginning of the query if no cursor was given) to this batch's end_cursor (not the query's end_cursor). In a single transaction, subsequent query result batches for the same query can have a greater timestamp. Each batch's read timestamp is valid for all preceding batches. This value will not be set for eventually consistent queries in Cloud Datastore.