In the comparison the milliseconds are taken into account but when displaying an assertion is doesn't show them.
This can lead to strange result see below.
Expected <2012-04-25 20:40:18>, but found <2012-04-25 20:40:18>.
Comments: Associated with changeset 76792.
This can lead to strange result see below.
Expected <2012-04-25 20:40:18>, but found <2012-04-25 20:40:18>.
Comments: Associated with changeset 76792.