Calculator Guide

How to use the Hong Kong working day calculator

Follow the controls in the order they appear, then check the result and every excluded date. This page explains the tool; Use Cases show complete scenarios and Articles explain the source Hong Kong rules.

Open Calculator

A step-by-step guide to the controls and results in the Hong Kong calculator.

Last reviewed: July 2026

Step 1

Choose the calculation you want to run

At-a-Glance

•Default Mode handles one deadline or the difference between two dates
•Court Rules applies Hong Kong court counting rules to one period
•Sequential Periods joins two or more working-day stages

Start with the question you need the calculator to answer. The three cards at the top of the form change the controls below them.

Default Mode

Use this for a single forward or backward deadline, or to count the days between two known dates.

Court Rules

Use this when a Hong Kong court rule supplies the trigger, number of days and boundary wording.

Sequential Periods

Use this when the result of one working-day period becomes the start of the next period.

The calculator counts the period; the source supplies it

Before entering anything, identify the document, contract or rule that gives you the start event, the length of the period, and whether either boundary date counts.

Try it as you read

The mode cards are at the top of the calculator form.

Open the calculator

Working-week choice

Decide whether Saturday counts

At-a-Glance

•The Business Context control appears in Default Mode for working-day calculations
•Standard leaves out Saturdays, Sundays and General Holidays
•SFBC Construction leaves out Sundays and General Holidays, so Saturday can count

Check the working-day definition in the document you are using. Then select the matching Business Context. The control is hidden for calendar-day calculations because weekend days already remain in that count.

Standard: Saturday excluded

Start Monday 2 March 2026, exclude the start date, include the deadline date and add 5 working days. The result is Monday 9 March; 7 and 8 March appear under Excluded Dates.

SFBC Construction: Saturday included

Keep the same date, period and boundaries, but choose SFBC Construction. The result is Saturday 7 March because that Saturday takes the fifth place in the count.

This is a user choice

The calculator cannot tell which working week applies from the transaction name. Choose SFBC Construction only when the contract uses that convention.

See the context in use

See the Business Context choice in a complete setup.

Open the SFBC example

Related Resources

SFBC construction walkthrough

A complete setup using the SFBC Construction context

Default Mode

Run a standard date calculation

At-a-Glance

•Choose Deadline when you know a start date and a period
•Choose Difference when you already know both dates
•Use the Calendar days switch only when the period is stated in calendar days, weeks or months

Select Default Mode. Then work through the visible controls from left to right.

Default Mode set to calculate one calendar month from 15 September 2025 — Default Mode with Calendar days enabled and Months selected. Select the image to open the full-size view.

Calculation Mode

Choose Deadline to calculate a date. Choose Difference to measure the working or calendar days between two dates.

Direction

For a deadline, choose Forward to add a period to the start date or Backward to count back from an event date.

Calendar days

Leave this off for working days. Turn it on for calendar days, calendar weeks or calendar months; the Unit selector then appears.

Business Context

Choose Standard for a Monday-to-Friday working week. Choose SFBC Construction only when the contract uses the SFBC convention, where Saturdays can count and Sundays and General Holidays do not.

Include start date / Include deadline date

Match the wording of your rule or contract. These controls decide whether the start and deadline dates count.

Shutdown Period

Leave No Shutdown selected unless the organisation's timetable uses the optional CNY extended shutdown shown in the list.

Example: five Hong Kong working days

To add five ordinary working days, choose Deadline, Forward, leave Calendar days off, select Standard, enter the trigger date and 5, then set the boundary checkboxes to match your source. After calculating, open Excluded Dates to see every weekend and General Holiday left out.

Example: how the boundary checkboxes move the date

Start on Monday 2 March 2026 and add 3 Standard working days. With Include start date off and Include deadline date on, the counted days are Tuesday, Wednesday and Thursday, so the result is Thursday 5 March. Turn Include start date on and Monday becomes day 1, moving the result to Wednesday 4 March. If Include deadline date is off instead, the calculated date sits after the third counted day and the result moves to Friday 6 March.

Example: one calendar month

For the employment example, choose Deadline and Forward, turn on Calendar days, set Unit to Months, enter 15 September 2025 and 1, and include both boundary dates. The result is Tuesday 14 October 2025. Weekends and General Holidays stay inside a calendar-month period.

Follow a completed setup

See the Default Mode settings in a complete calculation.

Open the calendar-month example

Related Resources

Working days and calendar days

Worked examples showing why the counting method matters

Employment notice example

A calendar-month workflow using a real Hong Kong notice period

Court Rules

Use the Hong Kong Court Rules workflow

At-a-Glance

•Notice counts backward; Filing counts forward
•Periods of 7 days or less use working days; longer periods use calendar days
•Saturdays, Sundays and General Holidays are non-court days for a short period

Select Court Rules only after checking the court rule for your step. The form displays the counting method as you change the number of days.

Court Rules Mode set to a five-day Hong Kong filing period — Court Rules Mode showing the filing workflow and optional August exclusion. Select the image to open the full-size view.

Notice or Filing

Choose Notice to count backward from an event. Choose Filing to count forward from service or another trigger.

Number of days

Enter the period stated by the rule. At 7 days or less the workflow counts working days. At 8 days or more it counts calendar days.

Boundary checkboxes

Match the wording of the rule. Phrases such as “after”, “before” and “clear days” can produce different boundary settings.

August exclusion

Turn on Exclude Summer Vacation (August) only for a High Court pleading deadline to which RHC Order 3 rule 3 applies.

What the workflow applies

The result identifies the court profile and counting method. If the selected profile moves the final date, the result shows both the calculated date and the open-court date. Check Order 3 and the rule for your step to confirm that the final-day treatment applies to that act and filing method. The calculator cannot predict gale warning or Black Rainstorm days, so check actual closures before relying on the date.

Example: the seven-day threshold

In Filing, start on Wednesday 7 January 2026 and leave the start date out. A 7-day period uses working days and ends on Friday 16 January. Change only the period to 8 days and the workflow uses calendar days, ending on Thursday 15 January. Check the method shown in the result as well as the date.

Follow a court setup

See a short-period Court Rules setup and result.

Open the court filing example

Related Resources

Court filing walkthrough

A complete short-period court example

Court rules and weather warnings

What happens when weather disrupts a court day

Rules of the High Court (Cap. 4A)

Official Hong Kong e-Legislation text

Rules of the District Court (Cap. 336H)

Official Hong Kong e-Legislation text

Judiciary: Order 3 short-period summary

Official practical summary of the days excluded from periods of 7 days or less

Topic

Use the optional August exclusion

Apply the August exclusion only to a High Court pleading rule that requires it.

Optional court control

Apply the August exclusion only when the rule calls for it

At-a-Glance

•The control appears inside Court Rules Mode
•It removes 1 to 31 August from the selected court count
•It is not a general Hong Kong court-vacation setting

In Court Rules Mode, turn on Exclude Summer Vacation (August) only when the relevant High Court pleading rule excludes that period. Leave it off for other court steps.

What changes in the result

In the linked example, a five-day filing period from 30 July 2026 ends on 6 August with the control off. With the control on, August is skipped and the result is Friday 4 September. The result also lists the applied rule control so you can confirm the exclusion was used.

Compare the control

See the same period with the optional exclusion off and on.

Compare the August results

Related Resources

August pleading walkthrough

Compare the same filing period with the optional control off and on

Topic

Use shutdowns and build sequential periods

Join known working-day stages without inventing the event that triggers the next stage.

Shutdowns and linked periods

Use shutdowns and build Sequential Periods

At-a-Glance

•Each period is a separate working-day calculation
•The previous result becomes the next period's start date
•Boundary and shutdown settings are chosen separately for each period

Select Sequential Periods when you already know that several working-day periods form one chain. Do not use it to guess that one legal or contractual event automatically triggers another.

Review of two linked Hong Kong working-day periods — Review all periods shows each period's length, boundaries and shutdown choice before calculation. Select the image to open the full-size view.

Optional CNY shutdown

In Default Mode, the Shutdown Period selector appears for a working-day count. In Sequential Periods, each leg has its own shutdown setting. Choose CNY Extended Shutdown only when the organisation's timetable excludes Lunar New Year Eve through Day 7; otherwise keep No Shutdown.

Enter the initial Start Date.
Name Period 1 and enter its Number of working days.
Set the start-date and deadline-date checkboxes for that period.
Select its Shutdown Period, if one applies.
Add the next period and repeat. Its start is shown as the previous period's result date.
Open Review all periods before calculating to compare every period's settings.

Use one period when the next trigger is uncertain

A calculated date does not mean that the next stage starts on that date. If the next start event depends on service, approval, payment or another outside event, calculate the periods separately once that event occurs.

Try two linked periods

Add two periods, then compare their settings before calculating.

Open Sequential Periods

Results

Check what the result actually counted

At-a-Glance

•The headline gives the result date or the number of days
•The breakdown separates working days, weekends, holidays and shutdown days
•Excluded Dates lists the individual dates left out

Do not stop at the large date. Read the settings and the excluded-day list beneath it before using the result.

Hong Kong court filing result with date, period breakdown and timeline — A completed result showing the headline date, calculation method, breakdown, timeline and review controls. Select the image to open the full-size view.

1. Check the summary

Confirm the start date, period, direction, Business Context and Shutdown Period match what you entered.

2. Check the breakdown

The totals should explain the full date range. If a holiday or shutdown total looks wrong, check the individual dates.

3. Open Excluded Dates

Review each date and reason. This is the clearest way to spot the wrong working week or shutdown setting.

4. Check court adjustments

In Court Rules mode, distinguish the calculated date from a later or earlier open-court date shown by the result.

Use Calendar View for a day-by-day view, or export the result when you need a record of the settings and excluded dates you checked.

Practise reading a result

Use the court example to find the method, breakdown and excluded dates.

Check a completed result

Topic

Troubleshooting

Find the setting most likely to explain an unexpected result.

Troubleshooting

Fix a result that does not look right

At-a-Glance

•A one-day difference usually points to a boundary checkbox
•A larger difference often points to working days versus calendar days
•A holiday mismatch may come from Business Context, shutdown or an actual closure not known in advance

Off by one day

Recheck whether the start date and deadline date count.

Off by several days

Recheck Calendar days, Business Context and Shutdown Period. Then open Excluded Dates.

Court result changed method

Check the number entered. The Hong Kong court workflow changes from working days to calendar days after 7 days.

Calendar days is unavailable

Court Rules chooses working or calendar days from the court profile and period length. Sequential Periods supports working-day legs, so the Calendar days switch is disabled in both modes. Return to Default Mode for a manual calendar-day calculation.

Weather disrupted the date

Recheck the Judiciary's actual arrangements. Future gale warning and Black Rainstorm days cannot be known in advance.

The rule is unclear

Return to the rule or contract, or obtain advice, before choosing the settings. The calculator cannot decide which rule applies to you.

Try the correction

Change one setting at a time and compare the result.

Return to the calculator

Related Resources

Hong Kong calculation articles

Source-based explanations of common Hong Kong date rules