Duration compare

duration-compare · version 1.0.0 · Dates & times (UTC, ISO 8601) · free, no key needed

Compare two SI duration amounts after converting both to nanoseconds.

Use when you need to: duration compare · compare two durations · compare duration amounts.

Supported

• duration compare
• compare two durations
• compare duration amounts

Not supported

• months
• years
• weeks
• leap seconds
• ISO-8601 duration strings
• sort durations
• approximate compare

Behavior

• left and right are {value, unit} duration amounts with canonical integer-string values.
• Units are ns, us, ms, s, min, h, and day; day is exactly 86400 seconds.
• Each amount is converted to nanoseconds as a BigInt and compared numerically.
• cmp is -1, 0, or 1 for left < right, left == right, and left > right.
• Negative durations are allowed; leap seconds, months, years, and ISO-8601 duration strings are rejected.

Input

• left (object, required)
• right (object, required)

Output

• cmp (one of -1, 0, 1, required)

Limits

• max digits: 1000
• units: ["ns","us","ms","s","min","h","day"]

Example

Request input:

{
  "left": {
    "value": "1",
    "unit": "min"
  },
  "right": {
    "value": "59",
    "unit": "s"
  }
}

Response:

{
  "result": {
    "cmp": 1
  }
}

How to call it

MCP

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

{
  "id": "duration-compare",
  "version": "1.0.0",
  "input": {
    "left": {
      "value": "1",
      "unit": "min"
    },
    "right": {
      "value": "59",
      "unit": "s"
    }
  }
}

HTTP (no key)

curl -X POST https://computefirst.net/v1/tools/duration-compare/versions/1.0.0/execute \
  -H "Content-Type: application/json" \
  -d '{"left":{"value":"1","unit":"min"},"right":{"value":"59","unit":"s"}}'

The machine-readable contract is at /v1/tools/duration-compare/versions/1.0.0.

CLI

node cli.mjs run duration-compare 1.0.0 --input input.json --base-url https://computefirst.net

Get the client at /clients/cli/.

Related tools

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• ISO date-time compare: Compare two strict UTC ISO-8601 datetimes and return -1, 0, or 1.
• Duration add: Sum mixed SI duration terms in nanoseconds and return the exact rational in a target unit.
• Duration convert: Convert a canonical integer duration between nanosecond-based SI units as an exact rational.
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• ISO date range intersect: Compute the intersection of two inclusive [start, end] date ranges.