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Add Mainland China Working Days

Adds or subtracts official mainland China working days, skipping holiday periods and ordinary weekends while counting State Council-designated weekend makeup workdays.

When to use

You need a deadline or settlement date a stated number of mainland China national working days before or after a 2024-2026 date.

Do not use when: You need calendar days, a sector-specific settlement calendar, a local holiday calendar, or a result outside the 2024-2026 coverage.

Example user requests

What date is 5 China working days after 2026-09-24, accounting for Mid-Autumn and National Day?
从2026年9月18日起往后数5个中国工作日是哪天？
Subtract 10 official mainland China business days from 2026-03-02.

Formula

move one calendar day at a time in sign(working_days); decrement the remaining count only when is_working_day(date) is true

The start date is excluded for non-zero offsets. Official holiday-period dates and ordinary weekends are skipped; official weekend makeup workdays count. A zero offset returns the start date unchanged.

Inputs

Parameter	Type	Unit	Required	Description
`start_date`	date		yes	Starting mainland China civil date (YYYY-MM-DD), within 2024-2026.
`working_days`	integer	working days	yes	Signed number of official working days to add; the start date is excluded when non-zero. Negative values move backward. Range: ≥ -750, ≤ 750

Outputs

Output	Type	Unit	Description
`start_date`	date		Input start date.
`result_date`	date		Date reached after adding the requested working days.
`result_weekday`	string		Weekday of result_date.
`result_is_working_day`	boolean		Whether result_date is an official working day.
`working_days_added`	integer	working days	Signed working-day offset requested.
`calendar_days_elapsed`	integer	days	Signed Gregorian day difference result_date − start_date.
`non_working_days_skipped`	integer	days	Number of holiday/weekend dates crossed and not counted.
`adjusted_workdays_counted`	list		Weekend makeup workdays crossed and counted, with date and related holiday.
`source_document_ids`	string_list		Official notice identifiers used across the traversed years.
`dataset_version`	string		Version of the source-traceable mainland China work-calendar package.
`coverage_start`	date		First supported date in this package.
`coverage_end`	date		Last supported date in this package.

Example

Five working days across Mid-Autumn and National Day 2026: {"start_date":"2026-09-24","working_days":5} → {"result_date":"2026-10-09","result_weekday":"Friday","result_is_working_day":true,"working_days_added":5,"calendar_days_elapsed":15,"non_working_days_skipped":10}

Adjusted Sunday counts as a working day: {"start_date":"2026-09-18","working_days":5} → {"result_date":"2026-09-24","adjusted_workdays_counted":[{"date":"2026-09-20","related_holiday":"National Day","related_holiday_zh":"国庆节"}]}

GET https://tttkmbb.com/api/v1/calculate/china-add-working-days?start_date=2026-09-24&working_days=5

Machine access

API: GET https://tttkmbb.com/api/v1/calculate/china-add-working-days (query parameters) or POST with a JSON body {"inputs": {...}}
Schema: https://tttkmbb.com/api/v1/calculators/china-add-working-days · Markdown: https://tttkmbb.com/everyday/china-add-working-days.md · JSON definition: https://tttkmbb.com/everyday/china-add-working-days.json
MCP: server https://tttkmbb.com/mcp, tool add_china_working_days
OpenAPI operationId: add_china_working_days
Freshness: static. Authentication: none. Rate limit: fair use (see rate limits).

Sources

FAQ

Does the start date count?

No for non-zero offsets: +1 means the first official working day after start_date and −1 means the first before it. A zero offset returns start_date unchanged.

What happens if the result would be in 2027?

The calculator returns OUT_OF_RANGE instead of assuming a Monday-Friday calendar before the official 2027 holiday notice is published and incorporated.

Related calculators

Mainland China Working Day Checker — Inspect the official status and source for one date.
Mainland China Working Days Between Dates — Count official working days in a range.
Add or Subtract Days Calculator — Add plain calendar days without holiday rules.