lastModifiedSince property

If specified, only objects with a "last modification time" on or after this timestamp and objects that don't have a "last modification time" are transferred.

The last_modified_since and last_modified_before fields can be used together for chunked data processing. For example, consider a script that processes each day's worth of data at a time. For that you'd set each of the fields as follows: * last_modified_since to the start of the day * last_modified_before to the end of the day