Clarification on datetime columns in dmv - dm_hadr_database_replica_state AlwaysON.

Hi,

I have alwayson feature on mty server. There is a column is_local indicates whether the database is local to that server.

In last_sent_time and last_received_time values are mentioned for remote database(database on secondary server). How come last_sent_time exists for secondary server database. What does that indicates?

My query is 

select database_id,is_local,last_sent_time,last_received_time,last_hardened_time,
last_commit_time from sys.dm_hadr_database_replica_states where is_commit_participant= 1

Usually last_sent_time should be present for local indicating, when was the last logblock sent. But why its showing for remote database(secondary database).

Mano