ISO date clamp

iso-date-clamp · version 1.0.0 · Dates & times (UTC, ISO 8601) · free, no key needed

Clamp a YYYY-MM-DD calendar date into an inclusive [min, max] range.

Use when you need to: iso date clamp · bound date to range · restrict date to min max.

Supported

• iso date clamp
• bound date to range
• restrict date to min max

Not supported

• datetime input
• timezones
• open ranges

Behavior

• date, min, and max are strict YYYY-MM-DD proleptic Gregorian UTC calendar dates with year 0001-9999.
• min must not be after max, or the call is rejected.
• If date is before min, the result is min. If date is after max, the result is max. Otherwise the result is date unchanged.

Input

• date (string, required): min length 10; max length 10; pattern ^\d{4}-\d{2}-\d{2}$
• min (string, required): min length 10; max length 10; pattern ^\d{4}-\d{2}-\d{2}$
• max (string, required): min length 10; max length 10; pattern ^\d{4}-\d{2}-\d{2}$

Output

• date (string, required): min length 10; max length 10

Limits

• year min: 1
• year max: 9999

Example

Request input:

{
  "date": "2026-01-01",
  "min": "2026-02-01",
  "max": "2026-03-01"
}

Response:

{
  "result": {
    "date": "2026-02-01"
  }
}

How to call it

MCP

Connect https://computefirst.net/mcp (setup), then call execute with:

{
  "id": "iso-date-clamp",
  "version": "1.0.0",
  "input": {
    "date": "2026-01-01",
    "min": "2026-02-01",
    "max": "2026-03-01"
  }
}

HTTP (no key)

curl -X POST https://computefirst.net/v1/tools/iso-date-clamp/versions/1.0.0/execute \
  -H "Content-Type: application/json" \
  -d '{"date":"2026-01-01","min":"2026-02-01","max":"2026-03-01"}'

The machine-readable contract is at /v1/tools/iso-date-clamp/versions/1.0.0.

CLI

node cli.mjs run iso-date-clamp 1.0.0 --input input.json --base-url https://computefirst.net

Get the client at /clients/cli/.

Related tools

• ISO date-time clamp: Clamp a strict UTC ISO-8601 datetime into an inclusive [min, max] range.
• ISO date min max: Return the earliest and latest date in a non-empty array of YYYY-MM-DD calendar dates.
• ISO date add: Add a signed whole-day delta to a strict YYYY-MM-DD calendar date.
• ISO date add months: Add a signed month count to a YYYY-MM-DD date, clamping the day to the target month.
• ISO date add years: Add a signed whole-year delta to a YYYY-MM-DD date, clamping the day if 29 February has no match.
• ISO date business day add: Add a signed count of business days to a date, skipping caller-supplied weekend weekdays and holidays.