瑜伽論記 1.415

1.415

解壽量中，梵前益天者，即是第二梵輔天也。大梵王前作饒益故，有九種：一日月歲數。法華論云：晝、夜、日、月、時、年以此為數。

In explaining the lifespan: the "heavens benefiting before Brahmā" are the second, the Brahmā-purohita heavens. Because they perform benefits in front of the Great Brahmā King, there are nine types: first, reckoning by days, months, and years. The Commentary on the Lotus Sūtra states: "Days, nights, solar days, months, seasons, and years serve as this reckoning."