Select the 'Age Calculator' mode tab. Enter your exact date of birth (and optionally birth time for minute-level resolution). The calculator instantly breaks down your age into years, months, days, total elapsed days, hours, minutes, and seconds, alongside Western and Chinese zodiac signs, generation bracket, birthstone, and countdowns to your next birthday and half-birthday.

An age calculator specifically computes elapsed life duration from a birth date to a reference date, displaying demographic milestones, generation brackets, and zodiac data. A date difference calculator is a general temporal engine that measures duration between any two historical or future calendar dates, computing total calendar days, week breakdowns, and working days.

The Business Days mode steps through each calendar day in the selected range and filters out non-working days based on your chosen rule: Standard Mon-Fri (Sat/Sun off), Middle East Sun-Thu (Fri/Sat off), or 6-Day Workweeks (Sun only). You can also configure the number of custom public/bank holidays falling on weekdays to deduct them from the gross working total.

The date calculation engine adheres to the standard Gregorian calendar specification: a year is a leap year (366 days with February 29) if divisible by 4, except for century years not divisible by 400 (e.g., 2000 and 2024 are leap years; 1900 and 2100 are not). Month and year intervals properly reflect varying month lengths (28 to 31 days).

Yes! In 'Add or Subtract' mode, enable the 'Count business days only (exclude weekends)' option. When active, adding 5 days to a Friday will automatically skip Saturday and Sunday, landing cleanly on the following Friday (5 full business working days).

100% private. All date math, age calculations, and format conversions execute entirely client-side in your web browser JavaScript engine. No dates of birth, timestamps, or duration requests are ever transmitted to remote servers, stored in databases, or logged.

The engine adds exact millisecond offsets (e.g., 10,000 × 86,400,000 ms) from your birth timestamp to pinpoint the exact Gregorian calendar date when you turn 10,000 or 20,000 days old. It also calculates your half-birthday (exactly 6 calendar months from your birthdate) and reports whether milestones are past or pending.

You can download structured JSON calculation audit reports (.json), RFC 4180 CSV breakdown matrices (.csv), and direct Markdown files (.md) or copy GitHub Flavored Markdown summary tables to your clipboard with one click, complete with customizable base filenames and date stamp suffixes.

Click the '💻 API Code' button in the toolbar (or press Alt+S) to open the Developer API & Integration Code Snippets Studio. Choose from zero-dependency implementations across TypeScript, Python, Go, Rust, Java, and Bash to compute date differences and business days programmatically, and download ready-to-run standalone scripts with one click.

Press '/' to focus the start date input, 'Ctrl+Enter' to quick copy the primary result metric, 'Alt+P' for smart clipboard auto-detect (automatically parsing date math, intervals, and dates from your clipboard), 'Alt+V' to toggle between 2-Column Split Studio and Stacked layout, 'Alt+S' to open API code snippets, 'Alt+K' or '?' for the shortcuts guide, 'Alt+R' for random benchmark scenarios, 'Alt+M' to copy the Markdown table, 'Alt+C' to export CSV, 'Alt+J' to download JSON, and 'Escape' to dismiss modals.