# Add Sri Lanka Working Days

> Adds or subtracts Sri Lanka authority-scope working days in exact coverage.

- Calculator id: `sri-lanka-public-add-working-days` · Category: Everyday Life (`everyday`) · Tool name: `add_lk_working_days`
- Canonical page: https://tttkmbb.com/everyday/sri-lanka-public-add-working-days · This document: https://tttkmbb.com/everyday/sri-lanka-public-add-working-days.md · JSON definition: https://tttkmbb.com/everyday/sri-lanka-public-add-working-days.json

## Purpose

Adds or subtracts Sri Lanka authority-scope working days in exact coverage.

**Use when:** You need a deterministic Sri Lanka working-day offset.

**Do not use when:** This is a combined official holiday-class calendar, not a universal private-employer closure rule. Public, bank and mercantile classifications remain in each event kind; the March 18, March 25 and April 1 fuel-conservation entries apply to government offices only and the schedule was cancelled effective April 8. Essential services, schools, private employers, sector agreements, local arrangements and later unlisted notices are not inferred. The additional day after the National Vesak Festival is not invented beyond the published May 2 calendar entry.

## Example user requests

- Add or subtract Sri Lanka working days around Poya holiday.
- Add or subtract Sri Lanka working days around Temporary government-office Wednesday.


## Input

| Parameter | Type | Unit | Required | Description |
| --- | --- | --- | --- | --- |
| `start_date` | date |  | required | Gregorian start date in 2026-2026. |
| `working_days` | integer |  | required | Signed offset; start date excluded for non-zero offsets. (min -1000, max 1000) |

## Output

| Field | Type | Unit | Description |
| --- | --- | --- | --- |
| `start_date` | date |  | Input date. |
| `result_date` | date |  | Date reached. |
| `working_days_added` | integer |  | Signed requested offset. |
| `calendar_days_elapsed` | integer |  | Signed Gregorian difference. |
| `public_holidays_skipped` | list |  | Exact events crossed. |
| `territory` | string |  | LK (Sri Lanka). |
| `territory_name` | string |  | Sri Lanka |
| `day_type` | string |  | Deterministic classification: official_weekend, regular_workday, or the first published authority event kind. |
| `holiday_names` | string_list |  | Events applying on the date. |
| `holiday_kinds` | string_list |  | Authority event classifications. |
| `holiday_details` | list |  | Structured event details, including partial-day notes where published. |
| `calendar_scope` | string |  | Sri Lanka 2026 public, bank, mercantile and full-moon Poya holiday calendar, plus dated temporary government-office closures |
| `holiday_policy` | string |  | Sri_Lanka_Holidays_Act_No_29_of_1971_2026_public_bank_mercantile_and_Poya_calendar |
| `substitute_day_policy` | string |  | published_official_dates_only; no next-day or employer-lieu inference; later Gazette or official circular overrides |
| `calendar_profile` | string |  | sri-lanka-public-holidays |
| `dataset_version` | string |  | lk-public-bank-mercantile-2026.1 |
| `sources` | list |  | Authority and legislation sources. |

## Formula

`move one day at a time; decrement only on status.is_working_day=true`

Skip Saturday/Sunday and exact pinned authority events; do not add unverified substitute days.

## Data Sources

- Sri Lanka Ministry of Public Administration – 2026 Holidays Act Gazette — https://moha.gov.lk/web/images/latest_document/government_holidays/2026/2026_Holidays_En.pdf (government_official_gazette_pdf)
- Sri Lanka Government Documents Portal – 2026 Desk Calendar — https://documents.gov.lk/view/calander/2026/2026_E.pdf (government_official_calendar_pdf)
- Central Bank of Sri Lanka – Bank Holidays for 2026 — https://dj0oywq28grwy.cloudfront.net/en/about/about-the-bank/bank-holidays-2026 (official_bank_cross_check)
- Sri Lanka Ministry of Public Administration – Circular 09/2026(I) — https://pubad.gov.lk/web/images/circulars/2026/E/1775542012-09-2026-i-e.pdf (government_official_circular_pdf)
- Sri Lanka Department of Government Information – special government holiday announcement — https://media.gov.lk/media-gallery/latest-news/3571-wednesday-declared-special-government-holiday-amid-fuel-supply-concerns (government_official_news_release)
- Daily Mirror – Vesak follow-up clarification — https://www.dailymirror.lk/breaking-news/Day-after-National-Vesak-Festival-not-a-public-holiday-Labour-Dept/108-337733 (reputable_news_cross_check)
- Sunday Times – temporary Wednesday public-sector schedule — https://sundaytimes.lk/online/news-online/Wednesdays-declared-holiday-for-public-sector-to-save-fuel/2-1151522 (reputable_news_cross_check)

Data freshness: `static`. Pinned lk-public-bank-mercantile-2026.1 package.

## API

- `GET https://tttkmbb.com/api/v1/calculate/sri-lanka-public-add-working-days?start_date=…&working_days=…`
- `POST https://tttkmbb.com/api/v1/calculate/sri-lanka-public-add-working-days` 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/sri-lanka-public-add-working-days · OpenAPI operationId `add_lk_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:  `run_calculator` with `{"calculator_id": "sri-lanka-public-add-working-days", "inputs": {…}}`

## Example

- Zero offset is identity: inputs `{"start_date":"2026-01-01","working_days":0}` → `{"result_date":"2026-01-01","working_days_added":0}`

```
GET https://tttkmbb.com/api/v1/calculate/sri-lanka-public-add-working-days?start_date=2026-01-01&working_days=0
```

## Limitations

This is a combined official holiday-class calendar, not a universal private-employer closure rule. Public, bank and mercantile classifications remain in each event kind; the March 18, March 25 and April 1 fuel-conservation entries apply to government offices only and the schedule was cancelled effective April 8. Essential services, schools, private employers, sector agreements, local arrangements and later unlisted notices are not inferred. The additional day after the National Vesak Festival is not invented beyond the published May 2 calendar entry. Skip Saturday/Sunday and exact pinned authority events; do not add unverified substitute days. All values are computed from the formula above; no measurement or live data is involved.

## FAQ

**Does a public holiday guarantee that every private employer closes?**

No. Public, bank and mercantile classifications are returned as source evidence; private-employer, sector and local closure rules are not inferred.

**Are the Wednesday fuel-conservation holidays still open-ended?**

No. Only March 18, March 25 and April 1 are represented; the official cancellation made Wednesdays normal government-office working days from April 8, 2026.

## Related

- [Sri Lanka Working Day](https://tttkmbb.com/everyday/sri-lanka-public-working-day.md) — Inspect a date and source evidence.