# Count Singapore Official Working Days

> Counts Singapore working and non-working dates in a 2026-2027 range using MOM public holidays and the CLDR Saturday/Sunday baseline.

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

## Purpose

Counts Singapore working and non-working dates in a 2026-2027 range using MOM public holidays and the CLDR Saturday/Sunday baseline.

**Use when:** You need an auditable Singapore working-day count for a pinned year.

**Do not use when:** You need an employer-specific rest-day roster, bank/exchange closures or future years.

## Example user requests

- Count Singapore working days from 2027-02-01 to 2027-02-15.


## Input

| Parameter | Type | Unit | Required | Description |
| --- | --- | --- | --- | --- |
| `start_date` | date |  | required | First date in 2026-2027. |
| `end_date` | date |  | required | Last date in 2026-2027. |
| `include_start_date` | boolean |  | optional, default true | Whether start_date participates. |
| `include_end_date` | boolean |  | optional, default true | Whether end_date participates. |

## Output

| Field | Type | Unit | Description |
| --- | --- | --- | --- |
| `normalized_start_date` | date |  | Earlier endpoint. |
| `normalized_end_date` | date |  | Later endpoint. |
| `working_days` | integer |  | MOM-reference working dates. |
| `non_working_days` | integer |  | Weekend and public-holiday dates. |
| `public_holidays_counted` | list |  | MOM events in the range. |
| `territory` | string |  | SG. |
| `territory_name` | string |  | Singapore. |
| `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

`for each included date: working_days += singapore status.is_working_day`

Normalize endpoints, apply endpoint flags, and count the pinned MOM public-holiday calendar over the CLDR weekly baseline.

## 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`. Pinned MOM 2026-2027 package.

## API

- `GET https://tttkmbb.com/api/v1/calculate/singapore-working-days-between?start_date=…&end_date=…`
- `POST https://tttkmbb.com/api/v1/calculate/singapore-working-days-between` 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-days-between · OpenAPI operationId `count_singapore_working_days` 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: `count_singapore_working_days` (dedicated) or `run_calculator` with `{"calculator_id": "singapore-working-days-between", "inputs": {…}}`

## Example

- Singapore February 2027: inputs `{"start_date":"2027-02-01","end_date":"2027-02-15","include_start_date":true,"include_end_date":true}` → `{"working_days":10}`

```
GET https://tttkmbb.com/api/v1/calculate/singapore-working-days-between?start_date=2027-02-01&end_date=2027-02-15&include_start_date=true&include_end_date=true
```

## Limitations

You need an employer-specific rest-day roster, bank/exchange closures or future years. Normalize endpoints, apply endpoint flags, and count the pinned MOM public-holiday calendar over the CLDR weekly baseline. All values are computed from the formula above; no measurement or live data is involved.

## FAQ

**Does this count a specific employee's rest day?**

No. The weekly rest day is employer-rostered and not inferred.

## Related

- [Singapore Official Public-Holiday Working Day](https://tttkmbb.com/everyday/singapore-working-day.md) — Inspect a date and its source basis.