[Pharo-project] can someone explain me this method?

comments? decent variable names? no magic numbers? NOW you can find NONE of that in dayMonthYearDo! ================================================================== dayMonthYearDo: aBlock "Evaluation the block with three arguments: day month, year." | l n i j dd mm yyyy | l := jdn + 68569. n := 4 * l // 146097. l := l - (146097 * n + 3 // 4). i := 4000 * (l + 1) // 1461001. l := l - (1461 * i // 4) + 31. j := 80 * l // 2447. dd := l - (2447 * j // 80). l := j // 11. mm := j + 2 - (12 * l). yyyy := 100 * (n - 49) + i + l. ^ aBlock value: dd value: mm value: yyyy. ================================================================== so can anyone explain me the magic numbers here??