Legal Fictions in Calculating Time

Considering part of the 7th day of Mourning to be the full 7th day

Considering part of the 30th day of Mourning to be the full 30th day

Counting a single day as part of two consecutive, mutually exclusive periods of time: Rosh HaShanah 10b
Considering the first/last day of the year to be the entire year, in calculating a king's reign: Rosh HaShanah 2b, 7b
Considering 1 day of a month, to be equivalent to passage of the entire month: Rosh HaShanah 10b
Considering 1 day of the year to be equivalent to passage of the entire year: Rosh HaShanah 10b, 12b
Considering 30 days of the year to be equivalent to passage of the entire year: Rosh HaShanah 10b, 12b

Considering one day of the year to be the entire year, in calculating the age of an animal to be fit for a specific offering: Rosh HaShanah 10a-b
Considering one day of the year to be the entire year, in calculating the growth of a plant for its status vis-a-vis prohibitions on using produce of a tree's first 3 years: Rosh HaShanah 10a-b
Counting the remainder of the 1st day when a menstruating woman sees blood, as the 1st day of her 7-day period of waiting: Rosh HaShanah 10a
Counting part of the 7th day after a menstruating woman sees blood, as the entire 7th day to complete the period of waiting: Rosh HaShanah 10a


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