Type Alias DayType<T>

DayType: T extends "02"
| "2"
    ?
        | `${1
        | 2
        | 3
        | 4
        | 5
        | 6
        | 7
        | 8
        | 9}`
        | `${0}${1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9}`
        | `${1}${0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9}`
        | `${2}${0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9}`
    :
        | `${1
        | 2
        | 3
        | 4
        | 5
        | 6
        | 7
        | 8
        | 9}`
        | `${0}${1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9}`
        | `${1}${0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9}`
        | `${2}${0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9}`
        | `${3}${T extends MonthsWithout31Days ? 0 : 0 | 1}`