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date_add_subtract

verifiedv0.1

Adds or subtracts days, weeks, months or years from one calendar date in the browser. Pass startIso as YYYY-MM-DD (exactly 10 chars), amount as a non-negative integer (0–10000), and optional unit and direction. startToday is UI-only — always pass startIso. Variant URLs are not a second machine Tool — pass unit and direction explicitly. Do not use this to measure the span between two dates (that is date_duration).

Updated 9/3/2026 · Created 9/3/2026

Input Schema

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "startIso",
    "amount"
  ],
  "properties": {
    "unit": {
      "enum": [
        "days",
        "weeks",
        "months",
        "years"
      ],
      "type": "string",
      "default": "days"
    },
    "amount": {
      "type": "integer",
      "maximum": 10000,
      "minimum": 0
    },
    "startIso": {
      "type": "string",
      "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
      "maxLength": 10,
      "minLength": 10
    },
    "direction": {
      "enum": [
        "add",
        "subtract"
      ],
      "type": "string",
      "default": "add"
    },
    "startToday": {
      "type": "boolean",
      "default": true
    }
  },
  "additionalProperties": false
}

Full Contract

{
  "name": "date_add_subtract",
  "description": "Adds or subtracts days, weeks, months or years from one calendar date in the browser. Pass startIso as YYYY-MM-DD (exactly 10 chars), amount as a non-negative integer (0–10000), and optional unit and direction. startToday is UI-only — always pass startIso. Variant URLs are not a second machine Tool — pass unit and direction explicitly. Do not use this to measure the span between two dates (that is date_duration).",
  "inputSchema": {
    "type": "object",
    "$schema": "http://json-schema.org/draft-07/schema#",
    "required": [
      "startIso",
      "amount"
    ],
    "properties": {
      "unit": {
        "enum": [
          "days",
          "weeks",
          "months",
          "years"
        ],
        "type": "string",
        "default": "days"
      },
      "amount": {
        "type": "integer",
        "maximum": 10000,
        "minimum": 0
      },
      "startIso": {
        "type": "string",
        "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
        "maxLength": 10,
        "minLength": 10
      },
      "direction": {
        "enum": [
          "add",
          "subtract"
        ],
        "type": "string",
        "default": "add"
      },
      "startToday": {
        "type": "boolean",
        "default": true
      }
    },
    "additionalProperties": false
  }
}

GET /api/tool/simpletoolstack.com/date_add_subtract