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Exact Japanese text & date tools: char count, business days with JP holidays, era, tax, units.

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add_days Read-only

Find the date N days (or N business days) after or before a date, with its weekday and Japanese era date (wareki). unit "business" skips Saturdays, Sundays and Japanese national holidays; "weekdays" skips only weekends. Good for deadlines in Japan. N from 0 to 100,000.

daysinteger, required

How many days to move.

start_datestring, required

Date in YYYY-MM-DD (1873-01-01 to 2200-12-31)

langstring

Language of the user. Use "ja" when the user writes in Japanese (affects the source link and notes). Default "en".

unitstring

"calendar" (default), "business" (Japan: skip weekends and national holidays) or "weekdays" (skip weekends only).

directionstring

Default "after".

Tools (7)

add_days

read-only

Argument	Type	Description
days*	integer	How many days to move.
lang	string	Language of the user. Use "ja" when the user writes in Japanese (affects the source link and notes). Default "en".
unit	string	"calendar" (default), "business" (Japan: skip weekends and national holidays) or "weekdays" (skip weekends only).
direction	string	Default "after".
start_date*	string	Date in YYYY-MM-DD (1873-01-01 to 2200-12-31)

Input schema (JSON)

{
  "type": "object",
  "required": [
    "start_date",
    "days"
  ],
  "properties": {
    "days": {
      "type": "integer",
      "maximum": 100000,
      "minimum": 0,
      "description": "How many days to move."
    },
    "lang": {
      "enum": [
        "ja",
        "en"
      ],
      "type": "string",
      "description": "Language of the user. Use \"ja\" when the user writes in Japanese (affects the source link and notes). Default \"en\"."
    },
    "unit": {
      "enum": [
        "calendar",
        "business",
        "weekdays"
      ],
      "type": "string",
      "description": "\"calendar\" (default), \"business\" (Japan: skip weekends and national holidays) or \"weekdays\" (skip weekends only)."
    },
    "direction": {
      "enum": [
        "after",
        "before"
      ],
      "type": "string",
      "description": "Default \"after\"."
    },
    "start_date": {
      "type": "string",
      "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
      "description": "Date in YYYY-MM-DD (1873-01-01 to 2200-12-31)"
    }
  },
  "additionalProperties": false
}

calculate_age

Calculate exact age from a birth date: age in years, years/months/days, Japanese kazoedoshi (traditional age), days since birth, next birthday and days until it, weekday of birth, Japanese era (wareki) of the birth date and the zodiac animal (eto). February 29 birthdays move to March 1 in non-leap years. Reference date defaults to today in Japan.

read-only

Argument	Type	Description
lang	string	Language of the user. Use "ja" when the user writes in Japanese (affects the source link and notes). Default "en".
birth_date*	string	Date in YYYY-MM-DD (1873-01-01 to 2200-12-31)
reference_date	string	Date in YYYY-MM-DD (1873-01-01 to 2200-12-31)

Input schema (JSON)

{
  "type": "object",
  "required": [
    "birth_date"
  ],
  "properties": {
    "lang": {
      "enum": [
        "ja",
        "en"
      ],
      "type": "string",
      "description": "Language of the user. Use \"ja\" when the user writes in Japanese (affects the source link and notes). Default \"en\"."
    },
    "birth_date": {
      "type": "string",
      "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
      "description": "Date in YYYY-MM-DD (1873-01-01 to 2200-12-31)"
    },
    "reference_date": {
      "type": "string",
      "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
      "description": "Date in YYYY-MM-DD (1873-01-01 to 2200-12-31)"
    }
  },
  "additionalProperties": false
}

consumption_tax

Calculate Japanese consumption tax with exact integer arithmetic: tax-excluded to tax-included or tax-included to tax-excluded, at 10% (standard), 8% (reduced) or any rate from 0 to 100 with up to 2 decimals, rounding down (floor, default), half up (round) or up (ceil). Returns the tax amount, both prices and the formula. Amounts are whole yen up to 13 digits.

read-only

Argument	Type	Description
rate	number \| string	Tax rate in percent. Default 10. 8 for the reduced rate (food, newspapers).
amount*	integer \| string	Amount in yen (whole number, up to 13 digits).
rounding	string	How to round fractions of a yen in the tax. Default "floor" (most common in Japan).
amount_type	string	Is amount tax-excluded (default; adds tax) or tax-included (extracts tax)?

Input schema (JSON)

{
  "type": "object",
  "required": [
    "amount"
  ],
  "properties": {
    "rate": {
      "type": [
        "number",
        "string"
      ],
      "description": "Tax rate in percent. Default 10. 8 for the reduced rate (food, newspapers)."
    },
    "amount": {
      "type": [
        "integer",
        "string"
      ],
      "description": "Amount in yen (whole number, up to 13 digits)."
    },
    "rounding": {
      "enum": [
        "floor",
        "round",
        "ceil"
      ],
      "type": "string",
      "description": "How to round fractions of a yen in the tax. Default \"floor\" (most common in Japan)."
    },
    "amount_type": {
      "enum": [
        "excluding_tax",
        "including_tax"
      ],
      "type": "string",
      "description": "Is amount tax-excluded (default; adds tax) or tax-included (extracts tax)?"
    }
  },
  "additionalProperties": false
}

convert_japanese_era

Convert between Western (Gregorian) dates and Japanese era dates (wareki: Meiji, Taisho, Showa, Heisei, Reiwa), using exact era start dates and "gannen" (元年) for year 1. Give either date (YYYY-MM-DD), or wareki such as "令和元年5月1日" / "R1.5.1", or era + year + month + day. Rejects dates that do not exist in that era (e.g. Heisei 31-05-01). Range 1873-01-01 to 2200-12-31.

read-only

Argument	Type	Description
day	integer
era	string	明治/大正/昭和/平成/令和 or Meiji/Taisho/Showa/Heisei/Reiwa (use with year, month, day).
date	string	Date in YYYY-MM-DD (1873-01-01 to 2200-12-31)
year	integer \| string	Year in the era (1 or "元" for the first year).
month	integer
wareki	string	Japanese era date to convert to Western, e.g. "令和元年5月1日", "平成31年4月30日", "S64.1.7".

Input schema (JSON)

{
  "type": "object",
  "properties": {
    "day": {
      "type": "integer",
      "maximum": 31,
      "minimum": 1
    },
    "era": {
      "type": "string",
      "description": "明治/大正/昭和/平成/令和 or Meiji/Taisho/Showa/Heisei/Reiwa (use with year, month, day)."
    },
    "date": {
      "type": "string",
      "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
      "description": "Date in YYYY-MM-DD (1873-01-01 to 2200-12-31)"
    },
    "year": {
      "type": [
        "integer",
        "string"
      ],
      "description": "Year in the era (1 or \"元\" for the first year)."
    },
    "month": {
      "type": "integer",
      "maximum": 12,
      "minimum": 1
    },
    "wareki": {
      "type": "string",
      "description": "Japanese era date to convert to Western, e.g. \"令和元年5月1日\", \"平成31年4月30日\", \"S64.1.7\"."
    }
  },
  "additionalProperties": false
}

convert_units

Convert units with official exact factors (NIST etc.), including Japanese units (tsubo, jo/tatami, shaku, sun, go, Japanese cups and spoons), temperature and fuel economy. Returns the exact result, a rounded display value, the factor, and extras such as feet-and-inches, inch fractions (1/16) and pounds-and-ounces. Unit ids by category - length: mm, cm, m, km, in, ft, yd, mi, nmi, shaku, sun; mass: mg, g, kg, t, oz, lb, st, ons, kwintal; temp: c, f, k; volume: ml, l, m3, tsp, tbsp, floz, cup, pt, qt, gal, flozuk, galuk, cupjp, tbspjp, tspjp, go; area: cm2, m2, ha, km2, sqin, sqft, sqyd, ac, sqmi, tsubo, jo, donum; speed: mps, kmh, mph, kn, fps; fuel: kml, l100, mpg, mpguk; pressure: pa, kpa, mpa, bar, psi, atm, mmhg; energy: j, kj, cal, kcal, wh, kwh, btu; power: w, kw, hp, ps; data: b, kb, mb, gb, tb, kib, mib, gib, tib.

read-only

Argument	Type	Description
to*	string	Unit id to convert to (same category).
from*	string	Unit id to convert from.
lang	string	Language of the user. Use "ja" when the user writes in Japanese (affects the source link and notes). Default "en".
value*	number \| string	Number to convert. Strings may use "," as thousands separator or fractions like "5 1/4".
category	string	Optional; inferred from the units.

count_characters

Count characters in a text exactly as KitBench's character counter does. Counts user-perceived characters (grapheme clusters: emoji sequences, combining marks and flags count as 1), plus counts excluding newlines and whitespace, half-width characters counted as 0.5, lines, paragraphs, Japanese manuscript paper (genkō yōshi, 20x20) sheets, UTF-8 bytes, English words, and a breakdown into hiragana, katakana, kanji, Latin letters, digits and other. Strong for Japanese text and character limits. Text up to 200,000 characters.

read-only

Argument	Type	Description
text*	string	The text to count (max 200,000 characters).
limit	integer	Optional character limit; the result then shows how many characters remain or are over.

Input schema (JSON)

{
  "type": "object",
  "required": [
    "text"
  ],
  "properties": {
    "text": {
      "type": "string",
      "description": "The text to count (max 200,000 characters)."
    },
    "limit": {
      "type": "integer",
      "minimum": 1,
      "description": "Optional character limit; the result then shows how many characters remain or are over."
    }
  },
  "additionalProperties": false
}

days_between

Count the days between two dates: total days (optionally including the start day), weeks and days, years/months/days, Japanese business days (excluding weekends and Japanese national holidays from the Cabinet Office list) and weekdays (Mon-Fri). Exact calendar arithmetic, no time zones. Dates 1873-01-01 to 2200-12-31.

read-only

Argument	Type	Description
lang	string	Language of the user. Use "ja" when the user writes in Japanese (affects the source link and notes). Default "en".
end_date*	string	Date in YYYY-MM-DD (1873-01-01 to 2200-12-31)
start_date*	string	Date in YYYY-MM-DD (1873-01-01 to 2200-12-31)
include_start_day	boolean	Count the start day too (e.g. 2026-01-01 to 2026-01-01 = 1 day). Default false.

Input schema (JSON)

{
  "type": "object",
  "required": [
    "start_date",
    "end_date"
  ],
  "properties": {
    "lang": {
      "enum": [
        "ja",
        "en"
      ],
      "type": "string",
      "description": "Language of the user. Use \"ja\" when the user writes in Japanese (affects the source link and notes). Default \"en\"."
    },
    "end_date": {
      "type": "string",
      "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
      "description": "Date in YYYY-MM-DD (1873-01-01 to 2200-12-31)"
    },
    "start_date": {
      "type": "string",
      "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
      "description": "Date in YYYY-MM-DD (1873-01-01 to 2200-12-31)"
    },
    "include_start_day": {
      "type": "boolean",
      "description": "Count the start day too (e.g. 2026-01-01 to 2026-01-01 = 1 day). Default false."
    }
  },
  "additionalProperties": false
}

{ "type": "object", "required": [ "value", "from", "to" ], "properties": { "to": { "enum": [ "mm", "cm", "m", "km", "in", "ft", "yd", "mi", "nmi", "shaku", "sun", "mg", "g", "kg", "t", "oz", "lb", "st", "ons", "kwintal", "c", "f", "k", "ml", "l", "m3", "tsp", "tbsp", "floz", "cup", "pt", "qt", "gal", "flozuk", "galuk", "cupjp", "tbspjp", "tspjp", "go", "cm2", "m2", "ha", "km2", "sqin", "sqft", "sqyd", "ac", "sqmi", "tsubo", "jo", "donum", "mps", "kmh", "mph", "kn", "fps", "kml", "l100", "mpg", "mpguk", "pa", "kpa", "mpa", "bar", "psi", "atm", "mmhg", "j", "kj", "cal", "kcal", "wh", "kwh", "btu", "w", "kw", "hp", "ps", "b", "kb", "mb", "gb", "tb", "kib", "mib", "gib", "tib" ], "type": "string", "description": "Unit id to convert to (same category)." }, "from": { "enum": [ "mm", "cm", "m", "km", "in", "ft", "yd", "mi", "nmi", "shaku", "sun", "mg", "g", "kg", "t", "oz", "lb", "st", "ons", "kwintal", "c", "f", "k", "ml", "l", "m3", "tsp", "tbsp", "floz", "cup", "pt", "qt", "gal", "flozuk", "galuk", "cupjp", "tbspjp", "tspjp", "go", "cm2", "m2", "ha", "km2", "sqin", "sqft", "sqyd", "ac", "sqmi", "tsubo", "jo", "donum", "mps", "kmh", "mph", "kn", "fps", "kml", "l100", "mpg", "mpguk", "pa", "kpa", "mpa", "bar", "psi", "atm", "mmhg", "j", "kj", "cal", "kcal", "wh", "kwh", "btu", "w", "kw", "hp", "ps", "b", "kb", "mb", "gb", "tb", "kib", "mib", "gib", "tib" ], "type": "string", "description": "Unit id to convert from." }, "lang": { "enum": [ "ja", "en" ], "type": "string", "description": "Language of the user. Use \"ja\" when the user writes in Japanese (affects the source link and notes). Default \"en\"." }, "value": { "type": [ "number", "string" ], "description": "Number to convert. Strings may use \",\" as thousands separator or fractions like \"5 1/4\"." }, "category": { "enum": [ "length", "mass", "temp", "volume", "area", "speed", "fuel", "pressure", "energy", "power", "data" ], "type": "string", "description": "Optional; inferred from the units." }, "significant_digits": { "type": "integer", "maximum": 15, "minimum": 1, "description": "Significant digits of result_formatted. Default 6." } }, "additionalProperties": false }