set Data Time
Sets the starting point for message retrieval. This corresponds to the `sentTime` in the message. If there are no messages in the local database, pass `0` for the first retrieval. Otherwise, pass the `sentTime` of the earliest message to retrieve the latest `count` messages.
Parameters
data Time
The starting point for message retrieval. This corresponds to the `sentTime` in the message. If there are no messages in the local database, pass `0` for the first retrieval. Otherwise, pass the `sentTime` of the earliest message to retrieve the latest `count` messages.