{
  "slug": "date",
  "title": "Date Calculator",
  "heading": "Date Calculator",
  "category": "other",
  "url": "https://www.revenuelab.fyi/toolbox/date",
  "summary": "Days between two dates, or add/subtract days from a date.",
  "description": "Pick a start and end date, or a base date plus a number of days, to get the answer.",
  "formula": null,
  "dateModified": "2026-10-03",
  "run_url": "https://www.revenuelab.fyi/api/public/calc?tool=date",
  "inputs": [
    {
      "id": "start",
      "label": "Start date",
      "kind": "date",
      "hint": null,
      "default": "1970-01-01"
    },
    {
      "id": "end",
      "label": "End date",
      "kind": "date",
      "hint": null,
      "default": "1970-01-01"
    }
  ],
  "outputs": [
    {
      "id": "days",
      "label": "Days between",
      "format": "number",
      "hint": null,
      "primary": true
    },
    {
      "id": "weeks",
      "label": "Weeks between",
      "format": "decimal",
      "hint": null,
      "primary": false
    },
    {
      "id": "absDays",
      "label": "Absolute days",
      "format": "number",
      "hint": null,
      "primary": false
    }
  ],
  "worked_example": {
    "inputs": [
      "Start date: 1970-01-01",
      "End date: 1970-01-01"
    ],
    "outputs": [
      "Days between: 0",
      "Weeks between: 0",
      "Absolute days: 0"
    ]
  },
  "how_to": {
    "title": "How to use this",
    "steps": [
      "Enter start date.",
      "Enter end date.",
      "Read your days between on the right — it updates as you type.",
      "Hit Share to keep the scenario or send it to someone."
    ]
  },
  "scenarios": [
    {
      "name": "Conservative",
      "description": "Lower-end numbers — what if things land soft?",
      "values": {
        "start": "1970-01-01",
        "end": "1970-01-01"
      }
    },
    {
      "name": "Typical",
      "description": "Defaults — the most common real-world setup.",
      "values": {
        "start": "1970-01-01",
        "end": "1970-01-01"
      }
    },
    {
      "name": "Ambitious",
      "description": "Higher-end numbers — what if things really pop?",
      "values": {
        "start": "1970-01-01",
        "end": "1970-01-01"
      }
    }
  ],
  "limitations": [
    "Estimates assume standard, average conditions — local rules, pricing, and materials vary.",
    "Results are rounded for readability; add a buffer before ordering, booking, or committing.",
    "Double-check anything with a real cost attached against a local quote."
  ],
  "faq": [
    {
      "q": "How does the date calculator work?",
      "a": "Pick a start and end date, or a base date plus a number of days, to get the answer."
    },
    {
      "q": "What do I need to enter?",
      "a": "2 values: start date, and end date. Each field starts with a sensible default, so you can change one number at a time and watch the result move."
    },
    {
      "q": "What does the days between result mean?",
      "a": "It is returned as a whole number and updates live as you edit the inputs, so you can compare two or three versions of a scenario in a few seconds."
    },
    {
      "q": "Is this calculator free, and do I need an account?",
      "a": "Yes, it's free, and no account is required. Nothing you type is stored on our servers — the maths runs entirely in your browser."
    },
    {
      "q": "How accurate is the result?",
      "a": "It applies the standard formula exactly, so the arithmetic is precise. Estimates assume standard, average conditions — local rules, pricing, and materials vary."
    },
    {
      "q": "Who is this tool for?",
      "a": "It's built for anyone doing everyday planning maths — a quick estimate that would otherwise need four browser tabs and a calculator app."
    }
  ],
  "related": [
    "https://www.revenuelab.fyi/toolbox/age",
    "https://www.revenuelab.fyi/toolbox/time-duration",
    "https://www.revenuelab.fyi/toolbox/hours"
  ],
  "license": "CC-BY-4.0",
  "citation": "RevenueLab — Date Calculator (https://www.revenuelab.fyi/toolbox/date)"
}