The term "throughput" refers to the percentage of a student cohort who complete a course sequence within a set period after having begun that sequence at the same point in time. Under AB 705 the set period for observing throughput rates is described in law as "one year". While that time frame seems intuitive enough, the operational definition of "one year" (or the "year clock") has varied somewhat across sources. For instance, the operational definition of the year clock used by MMAP has evolved over time and been refined. This document provides an overview of how the MMAP team defined the year clock prior to September 2020, as well as a revised definition of the year clock that the team implemented in September 2020. Additionally, it is argued that consistency across cohorts of students with different starting terms within reports is more critical than maintaining a problematic definition simply for future reports to use the same definition as historical reports.