日時
年齢・日付差・タイムスタンプなどのツール
下のツールを選ぶだけで利用できます。すべて無料でブラウザ内で動作します。
⏰ 日時 · 計 28 個のツール
年齢計算機Online age calculator: enter birthdate to get exact age in years/months/days, total days/hours, next birthday countdown, zodiac with Gregorian/lunar support.
年齢差計算機Calculate the difference between two dates in years, months and days. Calculates age gap in years/months/days with leap year support.
オンライン目覚ましOnline alarm clock tool: set time and ringtone with fullscreen and background alert for daily and work reminders, with one-click copy, offline.
2進時計Binary clock tool: show real-time binary clock with multi-format and learning mode for study and geek, with one-click copy, offline.
誕生日カウントダウンBirthday countdown tool: get countdown and age from birthday with reminders for wishes and anniversaries, with one-click copy, offline.
カウントダウンタイマーCountdown timer: set hours/minutes/seconds with fullscreen, sound alerts and loop for exams, workouts and presentations Supports batch processing and one-click copy.
日付加減計算Date add/subtract tool: add or subtract days, weeks and months from a date handling month-end and leap years for scheduling, with one-click copy and offline.
日付カウントダウンDate countdown: pick target date to get remaining days, hours and minutes with holiday and anniversary reminders for planning.
日付差計算機Date difference calculator: count days, weeks, months, business and weekend days between dates with auto order handling, one-click copy and offline.
日付フォーマット変換ツールDate format converter: enter date to convert to ISO, US, EU, RFC and timestamp with bulk for development and data, with one-click copy and offline.
日付情報ツールDate info calculator: enter date to get weekday, leap year, day of year and quarter with holiday marks for calendar and work planning.
Excel 日付シリアル変換Excel date converter: convert between Excel serial numbers and dates 1900 system with bulk and formatting for office data, with one-click copy and offline.
祝日カウントダウンFestival countdown tool: cover Chinese lunar and Gregorian festivals automatically counting down to next festival for planning, with one-click copy and offline.
Japan Era ConverterJapan era converter: enter Gregorian year to get Reiwa/Heisei/Showa era for Japan, multilingual.
うるう年判定計算機Leap year checker: check any year with Gregorian rules showing February days and nearby leap years for learning and calendar, with one-click copy and offline.
旧暦カレンダーLunar calendar: convert Gregorian and lunar dates with solar terms, festivals and almanac for traditional holidays. Supports batch processing and one-click copy.
多地点会議時刻計算機Meeting time calculator: enter start and end time to get duration, cost and person-hours with multi-timezone for meeting cost and efficiency.
会議時間プランナーMeeting planner: pick two time zones and work hours for the overlap window plus converted times, with one-click copy.
月相計算機Moon phase calculator: enter date to get moon phase, illumination and next full moon with lunar and astronomy data for stargazing.
ストップウォッチStopwatch timer: support start pause reset and laps with milliseconds and history for sports and lab timing, with one-click copy, offline and multilingual.
相対時間計算機Time ago calculator: calculate interval from a time to now with just now, minutes and days and timestamp conversion, one-click copy and offline.
時間差計算機Time duration calculator: get duration from start end with multi-segment sum and unit conversion for scheduling, with one-click copy, offline.
タイムスタンプ変換Timestamp converter: convert Unix seconds to dates showing local and UTC with weekday for development, with one-click copy and offline.
タイムゾーン変換Timezone converter: convert time between source and target zones with multi-city view for meetings and travel, with one-click copy, offline and multilingual.
時差クエリTimezone diff calculator: get difference between two zones with DST and table for collaboration and travel, with one-click copy, offline.
週番号計算機Week number calculator: get ISO week number and start end dates from date for scheduling and projects, with one-click copy, offline.
ワールドクロックWorld clock tool: show real-time multi-city times with difference and DST for collaboration and travel, with one-click copy, offline.
星座検索Zodiac sign finder: get zodiac sign from birthday with traits, fortune and match for fun and daily, with one-click copy, offline and multilingual.
よくある質問
「日時」カテゴリとは？
「日時」カテゴリには 28 個の無料ツールがあります。すべてブラウザ内で動作します。
これらのツールは無料ですか？
はい、すべて無料で回数制限もありません。
登録は必要ですか？
不要です。ページを開くだけで使えます。データはアップロードされません。
対応言語は？
This site supports 12 languages: Chinese, English, Japanese, Spanish, French, Portuguese, Arabic, Indonesian, Hindi, Thai, Vietnamese and Bengali.