How to use the New Zealand calculator
Find a deadline or count the days between two dates. This guide explains the settings, regional anniversary days and summer exclusions, then shows you how to check the result. For worked examples, visit Use Cases. For holiday dates and explanations of specific rules, browse the Articles.
On this page
- Last reviewed
- October 2026
Choose what you want to calculate
Under Calculation type, choose the option that matches your question. The form will show the settings you need.
- Deadline
- Start with a date and a length of time, such as 10 working days. Count forward to find a deadline, or backward from an event date.
- Days between
- Enter two dates to find out how many working days or calendar days fall between them.
- Sequential
- Calculate several stages in order. Each stage starts from the date reached by the previous one and has its own settings.
Check the rule before you start
For a legal or contractual deadline, check the agreement, law or rule for the starting date, the length of the period and which dates to count. The calculator counts using your settings; you decide which settings apply.
Find a deadline or count days between dates

- Choose Working days to skip weekends and selected holidays or exclusions
- Choose Calendar days to count every date
- Check whether the first and last dates should count
Choose your counting method, set any holiday exclusions, then enter the dates or period you want to calculate.
- Calculation type
- Choose Deadline to find a date, or Days between to count between two dates you already know.
- Counting method
- Working days skips weekends, nationwide public holidays and any regional anniversary days or extra exclusions you select. Calendar days counts every date, including holidays and weekends.
- Regional anniversary days and Additional excluded periods
- For working days, choose the relevant Regional anniversary days and any Additional excluded periods, such as a summer exclusion required by your agreement.
- Dates to include
- Select Include the start date if the starting date should count. For a deadline, check Include the deadline date. For Days between, the second box is Include the end date. Set each box according to the wording of your rule or agreement.
- Start date, Number and Unit
- For a deadline, enter the date to count from and the length of the period. For Days between, enter Start date and End date instead.
- Direction
- For a deadline, Forward counts after the starting date. Backward counts before it, for example when finding a date before an event.
How counting the start date changes the answer
Start on Monday 2 February 2026 and enter 3 working days, with the deadline date included. Leave the start date out and the result is Thursday 5 February. Count the start date and the result is Wednesday 4 February. The starting date becomes the first of the three days.
Related resources
- Section 54: do the start and end dates count?
How wording such as after, from, on and before affects which dates count
Choose which regional anniversary days to exclude
- Working-day counts already exclude nationwide public holidays
- Leave Regional anniversary days empty if no anniversary day applies
- Selecting several regions excludes the anniversary days for all of them
Regional anniversary days lets you choose which regional holidays to skip. Nationwide public holidays are already excluded. For a legal or contractual deadline, choose the region required by the rule or agreement, which may differ from where you are working.
- No regional anniversary days
- Leave the selection empty. Nationwide public holidays still apply, but no regional anniversary days are excluded.
- One region
- Choose Auckland, Canterbury, Chatham Islands, Hawke's Bay, Marlborough, Nelson, Otago, South Canterbury, Southland, Taranaki, Wellington or Westland.
- Several regions
- Select each region you need. The calculator skips a date if it is an anniversary day in any selected region.
After calculating, check the selected regions in Calculation details and the anniversary dates in Non-working dates.
Why the region can change your deadline
Count one working day forward from Friday 23 January 2026, leaving the start date out and counting the deadline date. With no regional anniversary days selected, the result is Monday 26 January. Select Auckland and it becomes Tuesday 27 January because Auckland Anniversary Day is skipped.
Related resources
- NZ regional anniversary days
Which anniversary calendar to use and how to check its dates
- New Zealand public holidays 2026
Nationwide and regional holiday dates for 2026
- NZ Mondayisation rules
When a weekend holiday is observed on a weekday
Exclude a summer period if your rules require it

- Five year-end date ranges are available under Additional excluded periods
- Choose the range required by your agreement, law or rule
- Choosing an excluded period does not change your regional anniversary selection
Some agreements and laws leave a block of summer dates out of a working-day count. If that applies to your deadline, select the matching option under Additional excluded periods. These dates are skipped as well as weekends and the public holidays in your chosen calendar. Leave this set to None if no extra exclusion applies.
- ADLS / TLANZ–REINZ / NZS 391x
- 24 Dec – 5 Jan
- ADLS agreement — LIM date
- 24 Dec – 15 Jan
- Legislation Act definition
- 25 Dec – 2 Jan
- High Court Rules summer exclusion
- 25 Dec – 15 Jan
- Resource Management Act definition
- 20 Dec – 10 Jan
Each range includes both the first and last dates shown. Similar ranges can give different answers. Check the wording and version of the document you are using, including any amendments or special clauses.
Related resources
- ADLS summer shutdown dates and other NZ exclusions
Compare the available date ranges and when each applies
- Property settlement working days
A property example with a summer exclusion
Set up a property, court or RMA deadline
- You set the counting rules for court deadlines yourself
- Summer exclusions tell the calculator which dates to skip
- You choose the starting date, regional holidays and which dates count
For a property deadline, check the agreement for the starting date, the length of the period, the relevant region and any summer exclusion. Then choose whether to count the first and last dates.
For a court deadline, the High Court Rules summer exclusion only leaves out its listed dates. Select it when the rule you are applying uses that working-day definition. It does not apply the other rules for your case or decide when your deadline starts.
For a Resource Management Act (RMA) deadline, select Resource Management Act definition when that definition applies. It does not select regional anniversary days for you. Set Regional anniversary days separately according to the rule you are using.
- What the calculator counts
- For working days, it skips weekends, nationwide holidays, your selected anniversary days and summer exclusion. It also follows your choices about counting the first and last dates.
- What you need to decide
- Which rule applies, when counting starts, how long the period is and whether a pause, extension or special direction changes it.
- What to check afterwards
- Compare the settings and excluded dates with the agreement, law or rule you are using.
The RMA option leaves your regional choice unchanged
Count seven working days from Friday 16 January 2026, leaving the start date out and counting the deadline date. With no regional anniversary days selected, the result is Tuesday 27 January. With Auckland selected, it is Wednesday 28 January. Choosing the RMA exclusion does not change either regional selection.
Related resources
- Property settlement example
A Wellington calculation using the ADLS summer exclusion
- RMA submission example
A calculation using the RMA summer exclusion
- RMA working-day guide
What to check when counting days under the Resource Management Act
Calculate several stages in order

- Each stage starts from the date reached by the previous one
- Set the counting method, holidays and dates to include for each stage
- Check the stage order before calculating
Choose Sequential when you need to count several periods one after another. Each stage has a tab and its own settings. Select a tab to review or change that stage.
- Start date
- Enter the date to count the first stage from.
- Name each stage
- Use the edit icon on a stage tab to give it a useful name, such as Due diligence, Finance or Settlement.
- Counting method
- Choose working days or calendar days for that stage.
- Regional anniversary days and Additional excluded periods
- Set Regional anniversary days and Additional excluded periods for each working-day stage. Different stages can use different settings.
- Dates to include
- Check Include the start date and Include the deadline date for each stage. Use the wording of the rule or agreement for that stage.
- Number, Unit and Direction
- Enter how long that stage lasts and whether to count forward or backward from its starting date.
- Add another period
- Select the plus button to add a stage, then fill in its settings.
- Move left / Move right
- Use the arrow buttons to change the order of the stages.
- Calculate
- Check each stage, then calculate. The result shows the date reached after every stage as well as the final date.
Check that the stages really follow each other
The calculator uses each result as the next stage's starting date. It cannot tell whether a condition has been met or a notice has been received. If a stage starts from a separate event, calculate it separately using the actual starting date.
Related resources
- Sequential property transaction
An example with due diligence, finance and settlement stages
Check the result and how it was counted

- Check the settings as well as the answer
- Use the calendar and its key to see which dates were counted
- Read any warnings before using or sharing the result
The result shows both the answer and how the calculator reached it. Use the details below the answer to check your settings.
- Result at the top
- The calculated date or number of days. Check that it answers the question you intended to ask.
- Calculation details
- Check the counting method, direction, holiday calendar and whether the first and last dates were included.
- Calendar view and Key
- Counted days are numbered in order on the calendar, and the key shows what each colour means and how many dates of each kind fall in the period. Dates that are not counted keep their colour and are not numbered. For Sequential, each stage is numbered within its own period.
- Non-working dates
- Review weekends, holidays, anniversary days and summer exclusions. These dates may still be listed when Calendar days counts them.
- Warnings
- Read any warnings about missing holiday data or settings that need attention before using the result.
- Export to PDF
- Download a record of the calculation to keep with your file or share. Check the settings before exporting.
Related resources
- NZ working-day examples
Examples for legal, property, HR and RMA deadlines, including several stages
Check an unexpected answer
- For a one-day difference, first check whether the start and final dates count
- For a missing holiday, check the counting method and regional selection
The answer is one day earlier or later than expected
The holiday or summer exclusion settings are missing
An anniversary day was skipped unexpectedly
The summer exclusion dates look wrong
An RMA result includes or excludes an anniversary day
The result warns about missing holiday data
Keep the calculation and the rule together
Save the preset URL with a note of the agreement, law or rule you used, its version and the choices you made. That makes it easier to explain or check the result later.
Related resources
- All New Zealand articles
Guides to holidays, property, employment and RMA working-day rules