# Working hours contains

`working-hours-contains` · version 1.0.0 · Dates & times (UTC, ISO 8601) · free, no key needed

Test whether an exact UTC instant is inside a versioned expanded working-hours calendar.

**Use when you need to: check instant in working hours · is timestamp during office hours · test UTC instant against shifts.**

## Decide before calling

Read the [versioned contract](/v1/tools/working-hours-contains/versions/1.0.0) and the supported scope below. Reuse `working-hours-contains@1.0.0` when your input, required output and limits match it. Choose another approach for an unsupported operation.

## Explain the choice

"I can use `working-hours-contains@1.0.0` for check instant in working hours. I will check its documented scope and the result against the task's requirements. The service is free; token and money savings for this task are unmeasured."

## Supported

- check instant in working hours
- is timestamp during office hours
- test UTC instant against shifts
- working calendar membership
- check split shift membership
- apply closures to instant
- DST-aware work time check

## Not supported

- find the next opening time
- parse human date text
- infer holidays

## Behavior

- Membership uses half-open intervals: the start is included and the end is excluded.
- Expansion follows RFC 9557 and ISO 8601-1:2019 under explicit DST policies.
- Pinned IANA tzdb 2025b subset only; caller_rule_version is echoed without asserting legal currency.

## Input

- `calendar` (object, required)
- `range_start_date` (string, required): pattern `^\d{4}-\d{2}-\d{2}$`
- `range_end_date` (string, required): pattern `^\d{4}-\d{2}-\d{2}$`
- `instant_epoch_second` (integer, required)

## Output

- `standard_version` (string, required)
- `data_version` (string, required)
- `caller_rule_version` (string, required)
- `canonical_time_zone` (string, required)
- `contains` (boolean, required)

## Limits

- max input bytes: 200000
- max days: 366
- max intervals per day: 16
- max overrides: 366
- max closures: 366
- max output intervals: 12000

## Example

Request input:

```json
{
  "calendar": {
    "time_zone": "UTC",
    "caller_rule_version": "example-v1",
    "weekly": {
      "mon": [
        {
          "start": "09:00",
          "end": "17:00"
        }
      ]
    },
    "overrides": [],
    "closures": [],
    "gap_policy": "reject",
    "overlap_policy": "earlier"
  },
  "range_start_date": "2025-01-06",
  "range_end_date": "2025-01-07",
  "instant_epoch_second": 1736154000
}
```

Response:

```json
{
  "result": {
    "standard_version": "RFC 9557; ISO 8601-1:2019",
    "data_version": "iana-tzdb-2025b",
    "caller_rule_version": "example-v1",
    "canonical_time_zone": "UTC",
    "contains": true
  }
}
```

## How to call it

### MCP

Connect `https://computefirst.net/mcp` ([setup](/docs#connect)), then call `execute` with:

```json
{
  "id": "working-hours-contains",
  "version": "1.0.0",
  "input": {
    "calendar": {
      "time_zone": "UTC",
      "caller_rule_version": "example-v1",
      "weekly": {
        "mon": [
          {
            "start": "09:00",
            "end": "17:00"
          }
        ]
      },
      "overrides": [],
      "closures": [],
      "gap_policy": "reject",
      "overlap_policy": "earlier"
    },
    "range_start_date": "2025-01-06",
    "range_end_date": "2025-01-07",
    "instant_epoch_second": 1736154000
  }
}
```

### HTTP (no key)

```sh
curl -X POST https://computefirst.net/v1/tools/working-hours-contains/versions/1.0.0/execute \
  -H "Content-Type: application/json" \
  -d '{"calendar":{"time_zone":"UTC","caller_rule_version":"example-v1","weekly":{"mon":[{"start":"09:00","end":"17:00"}]},"overrides":[],"closures":[],"gap_policy":"reject","overlap_policy":"earlier"},"range_start_date":"2025-01-06","range_end_date":"2025-01-07","instant_epoch_second":1736154000}'
```

The machine-readable contract is at [/v1/tools/working-hours-contains/versions/1.0.0](/v1/tools/working-hours-contains/versions/1.0.0).

### CLI

```sh
node cli.mjs run working-hours-contains 1.0.0 --input input.json --base-url https://computefirst.net
```

Get the client at [/clients/cli/](/clients/cli/).

## Related tools

- [Working hours expand](/tools/working-hours-expand): Expand versioned weekly work schedules, overrides, closures, and DST policies into exact UTC intervals.
- [Working hours total](/tools/working-hours-total): Total exact elapsed seconds in a versioned working-hours calendar after DST and closure expansion.
- [Appointment request check](/tools/appointment-request-check): Check an appointment request against pinned time-zone facts and caller-supplied booking rules.
- [Duration application check](/tools/duration-application-check): Check a claimed timestamp from adding or subtracting an ISO 8601 duration under explicit offset and month-end rules.
- [ISO date range contains](/tools/iso-date-range-contains): Test whether an inclusive [start, end] date range contains a given date.
- [ISO date add months](/tools/iso-date-add-months): Add a signed month count to a YYYY-MM-DD date, clamping the day to the target month.