Methodology and sources

Exactly what the tool does and where each number comes from. Reviewed 24 August 2026.

How your cycle is worked out

Your pattern is a sequence of days that repeats. You give it a reference date and which position in the cycle that day held; from there, the position of any other date is found by counting the days elapsed and taking the remainder of the division by the cycle length. That's why it works the same forwards as backwards, and doesn't depend on when you open the app.

Day counting is done on UTC midnights. That's a technical detail with a practical consequence: a daylight saving change doesn't shift your cycle. It's the most common bug in calculators built quickly, and it's covered by automated tests.

Hours worked

Gross duration is the difference between start and finish; if the finish is at or before the start, the shift is taken to cross midnight and belongs to the day it began. Only unpaid breaks are deducted from that. Paid breaks are shown separately but count as time worked, because they are.

Formula: hours worked = (finish − start) − unpaid breaks.

The Chilean working week

Law 21,561 reduced the ordinary working week in stages: 44 hours from April 2024, 42 hours from 26 April 2026 and 40 hours from April 2028. The tool uses 42 hours as an editable default.

Exceptional working-time systems — many 7x7 and 14x14 rosters — are not automatically governed by the general weekly limit but by the resolution that authorises them. That's why the tool forces no rule: it shows your hours and you check them against your contract.

Estimate only. Rules may vary by contract, approved shift system, collective agreement and applicable law. Verify your payslip with your employer or a qualified professional. This tool is not employment advice.

What it doesn't do

It doesn't work out income tax, pension or health contributions or net pay. It doesn't know your contract or your collective agreement. It doesn't replace your payslip.

Sources

Law 21,561 on the reduction of the working week, published by the Library of the National Congress of Chile. Rollout: April 2024 (44 h), April 2026 (42 h), April 2028 (40 h).