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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.

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.

Choose a calculation at the top of the form.
Open the calculator

Find a deadline or count days between dates

New Zealand calculator set to a forward working-day deadline using the Auckland anniversary calendar
A working-day deadline with Auckland anniversary days selected. Select the image to open the full-size view.
  • 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.

Check the wording of the rule or agreement you are using.
Read the guide to start and end dates

Related resources

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.

Check the location specified by the rule or agreement.
Read the anniversary-day guide

Related resources

Exclude a summer period if your rules require it

New Zealand calculator with the RMA year-end exclusion and no regional anniversary days selected
The RMA exclusion selected with no regional anniversary days. Select the image to open the full-size view.
  • 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.

Find the working-day definition in your agreement, law or rule.
Compare the summer exclusions

Related resources

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.

Follow an example with regional holidays and a summer exclusion.
Open the property example

Related resources

Calculate several stages in order

New Zealand calculator reviewing two sequential working-day periods with separate settings
Two stages, with the Response period tab selected to show its settings. Select the image to open the full-size view.
  • 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.

Each calculated date becomes the starting date for the next stage.
Open the example with several stages

Related resources

Check the result and how it was counted

New Zealand working-day result showing the calendar, key and review controls
A deadline result with a calendar, key and buttons for details and PDF export. Select the image to open the full-size view.
  • 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.
Compare the settings and excluded dates with the rules you need to follow.
Run a calculation

Related resources

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

Check Include the start date and Include the deadline date. For Days between, check Include the end date instead. Then check the dates, counting method and direction.

The holiday or summer exclusion settings are missing

These settings appear when you choose Working days. Calendar days counts every date, so it does not need holiday exclusions. For Sequential, select a stage tab to see that stage's settings.

An anniversary day was skipped unexpectedly

Check Regional anniversary days. If you selected several regions, the calculator skips anniversary days in any of them. Remove any regions that should not apply.

The summer exclusion dates look wrong

Check the option under Additional excluded periods. The available ranges have different start and end dates. Choose the one specified by your agreement, law or rule.

An RMA result includes or excludes an anniversary day

The RMA exclusion and Regional anniversary days are separate settings. Choosing the RMA option leaves your regional selection unchanged. Check whether the rule you are using requires a regional anniversary day to be skipped.

The result warns about missing holiday data

A missing date does not mean that no holiday applies. Check the current official holiday dates, then send us the preset URL and details of the missing date.

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.

Send the preset URL, the answer you expected and the rule you are using.
Report a problem

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