# Singapore Official Public-Holiday Working Day

> Checks a Singapore date using Ministry of Manpower national public holidays and explicitly published observed dates, with a separate employer-rest-day limitation.

- Calculator id: `singapore-working-day` · Category: Everyday Life (`everyday`) · Tool name: `check_singapore_working_day`
- Canonical page: https://tttkmbb.com/everyday/singapore-working-day · This document: https://tttkmbb.com/everyday/singapore-working-day.md · JSON definition: https://tttkmbb.com/everyday/singapore-working-day.json

## Purpose

Checks a Singapore date using Ministry of Manpower national public holidays and explicitly published observed dates, with a separate employer-rest-day limitation.

**Use when:** You need Singapore national public-holiday status for 2026-2027.

**Do not use when:** You need an employer roster, a non-Sunday weekly rest day, bank/exchange closures, or a year outside the pinned MOM coverage.

## Example user requests

- Is 2027-02-08 a Singapore working day after Chinese New Year?
- Check the Singapore public-holiday status of 2026-08-10.


## Input

| Parameter | Type | Unit | Required | Description |
| --- | --- | --- | --- | --- |
| `date` | date |  | required | Gregorian date in the pinned MOM 2026-2027 coverage. |

## Output

| Field | Type | Unit | Description |
| --- | --- | --- | --- |
| `territory` | string |  | SG. |
| `territory_name` | string |  | Singapore. |
| `weekday` | string |  | Gregorian weekday. |
| `is_working_day` | boolean |  | True when the CLDR Saturday/Sunday baseline is a weekday and no included MOM public holiday applies. |
| `day_type` | string |  | Regular weekday, regular weekend or MOM public holiday. |
| `holiday_names` | string_list |  | MOM holiday names applying on the date. |
| `holiday_observed` | boolean |  | True when the source explicitly publishes an observed date. |
| `weekend_days` | string_list |  | CLDR weekend convention used only as the baseline. |
| `rest_day_policy` | string |  | Employer-specific weekly rest-day placement is not inferred. |
| `calendar_scope` | string |  | Singapore national public holidays plus the CLDR Saturday/Sunday baseline. |
| `calendar_profile` | string |  | singapore-mom-public-holidays. |
| `source_quality` | string |  | Official Singapore government sources, with employer-rest-day limitation. |
| `dataset_version` | string |  | Pinned MOM evidence package. |
| `sources` | list |  | Official MOM, government open-data and legislation sources. |

## Formula

`is_working_day = CLDR weekday baseline and no MOM public-holiday event`

Apply the pinned MOM event dates on top of the CLDR Saturday/Sunday baseline. Do not infer an employer's weekly rest day.

## Data Sources

- Singapore Ministry of Manpower Public Holidays for 2026 — https://www.mom.gov.sg/newsroom/press-releases/2025/0616-public-holidays-for-2026 (government, published 2025-06-16)
- Singapore Ministry of Manpower Public Holidays for 2027 — https://www.mom.gov.sg/newsroom/press-releases/2026/0618-public-holidays-for-2027 (government, published 2026-06-18)
- Singapore public holidays 2027 open-data mirror — https://data.gov.sg/datasets/d_0ba69fc6d56717ff0bf8083c6af3bb84/view (government_open_data, published 2026-07-03)
- Singapore Holidays Act 1998 — https://sso.agc.gov.sg/Act/HA1998 (legislation)

Data freshness: `static`. MOM publishes dates one year in advance; refresh only after official release review.

## API

- `GET https://tttkmbb.com/api/v1/calculate/singapore-working-day?date=…`
- `POST https://tttkmbb.com/api/v1/calculate/singapore-working-day` with JSON body `{"inputs": {…}}`
- Response: unified envelope (`success`, `request`, `result.values`, `result.units`, `sources`, `freshness`, `timestamp`, `next_actions`, `links`); see https://tttkmbb.com/docs/response-format.md
- Schema: https://tttkmbb.com/api/v1/calculators/singapore-working-day · OpenAPI operationId `check_singapore_working_day` in https://tttkmbb.com/openapi.json
- Authentication: none. Rate limit: fair use, see https://tttkmbb.com/docs/rate-limits.md.

## MCP

- Server: `https://tttkmbb.com/mcp` (Streamable HTTP, JSON-RPC 2.0, no auth)
- Tool: `check_singapore_working_day` (dedicated) or `run_calculator` with `{"calculator_id": "singapore-working-day", "inputs": {…}}`

## Example

- Chinese New Year observed date: inputs `{"date":"2027-02-08"}` → `{"is_working_day":false,"holiday_observed":true}`

```
GET https://tttkmbb.com/api/v1/calculate/singapore-working-day?date=2027-02-08
```

## Limitations

You need an employer roster, a non-Sunday weekly rest day, bank/exchange closures, or a year outside the pinned MOM coverage. Apply the pinned MOM event dates on top of the CLDR Saturday/Sunday baseline. Do not infer an employer's weekly rest day. All values are computed from the formula above; no measurement or live data is involved.

## FAQ

**Does this calculate an employee's rostered rest day?**

No. MOM permits an employer to roster the weekly rest day on a day other than Sunday; that roster is not public data.

**Are future years extrapolated?**

No. The tool fails closed outside the pinned 2026-2027 official coverage.

## Related

- [Global Working Day Reference](https://tttkmbb.com/everyday/global-reference-working-day.md) — Use broad source-labelled coverage when no direct Singapore year is available.