Alternative for CONTACT_LAST_UPDATED_TIMESTAMP for APIs below 18

Question

I synchronize contacts with my server, and I need to make changes to the contact book (insert / delete / update), which will be synchronized with the server. To do this, I use "CONTACT_LAST_UPDATED_TIMESTAMP" and compare it with the timestamp in my database, which works fine.

But the problem is that CONTACT_LAST_UPDATED_TIMESTAMP is added in API 18 and I need to provide API 8 support.

so I'm looking for an alternative to CONTACT_LAST_UPDATED_TIMESTAMP for APIs below 18.

early.