Building dirty asset bundles

I am working on a project which uses multiple asset bundles. Whenever I do some changes in any of the assets I have to rebuild all asset bundles which takes a long time.

Is there a way to determine whether an asset being used in an asset bundle is out of date and rebuild those asset bundles only?


Problem solved.

Check date of asset bundle and compare this with date of each asset making up the asset bundle(including meta files if you are using them). If date of one or more assets is greater than date of asset bundle, then asset bundle is outdated, therefore rebuild.