{
  "id": "days-until-june-4",
  "version": "8968a054f16d",
  "status": "published",
  "name": "Days Until June 4",
  "question": "Days until June 4",
  "summary": "Counts the days from today, or any date you choose, to the next June 4, with its day of the week.",
  "category": "days",
  "subcategory": "countdowns",
  "url": "https://www.acalculator.org/days/days-until-june-4",
  "markdown": "https://www.acalculator.org/days/days-until-june-4.md",
  "kind": "function",
  "method": "Find the first June 4 on or after the start date, then count the days from the start date to it.",
  "assumptions": [
    "June 4 comes every year, so the count is never more than 365 days.",
    "The start date itself is not counted: from the day before June 4, the count is 1; on June 4 itself, it is 0.",
    "Start dates from January 1, 1900 to December 31, 2400 work for the count to June 4, the range the date field accepts.",
    "Today is the date on your own device, so the count to June 4 changes at midnight where you are. Dates are whole calendar days, so a daylight-saving change never adds or loses a day."
  ],
  "inputs": {
    "$schema": "https://json-schema.org/draft/2020-12/schema",
    "type": "object",
    "properties": {
      "from": {
        "title": "Count from",
        "description": "The date to count from. Today, unless you change it.",
        "type": "string",
        "format": "date"
      }
    }
  },
  "outputs": {
    "days": {
      "label": "Days until June 4",
      "description": "Whole days from the start date to the next June 4; 0 on the day itself.",
      "format": "integer"
    },
    "date": {
      "label": "Date",
      "description": "The next June 4 on or after the start date.",
      "format": "date-long"
    },
    "weekday": {
      "label": "Day of the week",
      "description": "The weekday of that date.",
      "format": "text"
    },
    "weeks": {
      "label": "In weeks",
      "description": "The same number of days in weeks and days.",
      "format": "text"
    }
  },
  "defaultAnswer": {
    "inputs": {
      "from": "2026-09-30"
    },
    "outputs": {
      "days": 247,
      "date": "2027-06-04",
      "weekday": "Friday",
      "weeks": "35 weeks and 2 days"
    },
    "text": "From September 30, 2026, there are 247 days until June 4 on Friday, June 4, 2027."
  },
  "examples": [
    {
      "given": {
        "from": "2027-06-04"
      },
      "expect": {
        "date": "2027-06-04",
        "days": 0
      },
      "source": "U.S. Naval Observatory, Leap Years: the Gregorian leap year rule (https://aa.usno.navy.mil/faq/leap_years); Python 3 datetime (docs/progress/WP-44/truth.py)"
    },
    {
      "given": {
        "from": "2027-01-01"
      },
      "expect": {
        "date": "2027-06-04",
        "days": 154
      },
      "source": "U.S. Naval Observatory, Leap Years: the Gregorian leap year rule (https://aa.usno.navy.mil/faq/leap_years); Python 3 datetime (docs/progress/WP-44/truth.py)"
    },
    {
      "given": {
        "from": "2027-06-05"
      },
      "expect": {
        "date": "2028-06-04",
        "days": 365
      },
      "source": "U.S. Naval Observatory, Leap Years: the Gregorian leap year rule (https://aa.usno.navy.mil/faq/leap_years); Python 3 datetime (docs/progress/WP-44/truth.py)"
    }
  ],
  "sources": [
    "5 U.S.C. 6103 (federal holidays; weekend rule in 6103(b) and Executive Order 11582). Checked against OPM holiday schedules.",
    "Equinoxes and solstices: Jean Meeus, Astronomical Algorithms (2nd ed., 1998), chapter 27, checked against the US Naval Observatory."
  ],
  "related": [
    "days-until-june-3",
    "days-until-june-5",
    "days-until-june-1",
    "days-until-june-2",
    "days-until-june-6",
    "days-until-june-7",
    "days-until-june-8",
    "days-until-june-9",
    "days-until-june-10",
    "days-until-june-11",
    "days-until-june-12",
    "days-until-june-13",
    "days-until-june-14",
    "days-until-june-15",
    "days-until-june-16",
    "days-until-june-17",
    "days-until-june-18",
    "days-until-june-19",
    "days-until-june-20",
    "days-until-june-21",
    "days-until-june-22",
    "days-until-june-23",
    "days-until-june-24",
    "days-until-june-25",
    "days-until-june-26",
    "days-until-june-27",
    "days-until-june-28",
    "days-until-june-29",
    "days-until-june-30",
    "days-between-dates"
  ],
  "changelog": []
}