Our P&L checklists are based on the date a set of regulations went into effect. This is referred to as the Effective Date of those regulations and it is displayed on every checklist. Generally, all checklists in a package have the same Effective Date. In some instances, an agency will issue a bulletin or an emergency regulation that impacts only certain checklists. When we update the impacted checklists, we will update the Effective Date and Last Revised date accordingly.
The Last Revised date indicates when the checklist was last updated and is shown in bold when it is within the past month. Generally, updates occur when the regulations change, but we do on occasion make updates unrelated to the regulations. For example, when a readability improvement is made at the suggestion of a user.