The expressions above read these as $const. They are the figures the annual refresh replaces, so they live as data rather than being written into the formulas — which is what makes a year-on-year change a one-line diff instead of an edit to arithmetic.
Constant
Value
statutoryCalendarDays
24
minorCalendarDays
31
minorAgeThreshold
18
daysPerCalendarWeek
7
Test vectors (7)
Every case is executed against this model on each build, by the Java engine and independently by a JavaScript one. A mismatch of a single cent fails the build, so the page cannot ship advertising a figure the model no longer produces.
Case 1 — N1 24 calendar days on a five-day week is about 17 working days, not 24
given daysPerWeek
5
given age
35
given daysTaken
0
expect calendarDaysEntitled
24
expect daysEntitled
17.1
Case 2 — N2 a six-day week gets more working days out of the same 24 calendar ones
given daysPerWeek
6
given age
35
given daysTaken
0
expect daysEntitled
20.6
Case 3 — N3 a three-day week
given daysPerWeek
3
given age
35
given daysTaken
0
expect daysEntitled
10.3
Case 4 — N4 under eighteen gets 31 calendar days, which is a week more
given daysPerWeek
5
given age
17
given daysTaken
0
expect calendarDaysEntitled
31
expect daysEntitled
22.1
Case 5 — N5 the band ends AT eighteen, so an eighteen-year-old is on the ordinary figure
given daysPerWeek
5
given age
18
given daysTaken
0
expect calendarDaysEntitled
24
expect daysEntitled
17.1
Case 6 — N6 days already taken come off the remainder
given daysPerWeek
5
given age
35
given daysTaken
7
expect daysRemaining
10.1
Case 7 — N7 taking more than the entitlement never goes negative
The whole model as JSON — inputs, outputs, formulas, vectors and sources in one re-runnable document.
This model is published under CC BY 4.0: use it, adapt it, build on it, with attribution. The licence covers the model — the expression of each rule and the arrangement of the catalog. The rates and thresholds are law, and nobody licenses those; the sources above are where they come from.