Anniversary counter — years/months/days/hours since a date
Type a start date (relationship, wedding, business launch, fan-club anniversary) and instantly see the elapsed time as 『Y years M months D days』, weeks, days, hours, minutes, and seconds. Upcoming milestones (100, 200, 1000 days, 1/5/10 year marks…) are computed with their own countdowns. Updates every second; copy any value in one click. Where age-calc is birthday-specific, this tool fits any anniversary. Everything runs in your browser.
How to use
Type a start date — relationship, wedding, business launch, fan-club anniversary, move-in date, whatever — and the elapsed time is shown as 『Y years M months D days』 plus weeks, days, hours, minutes, and seconds. Below that, the next upcoming anniversaries (100 / 200 / 1000 days, 7777 days, 1 / 5 / 10 / 50 / 100 year marks) are listed by proximity, with a live countdown. The whole view ticks every second.
FAQ
- How is this different from age-calc?
- This is a general-purpose elapsed-time viewer with no birthday-specific output (no zodiac, no kazoe). For age, eastern/western zodiac, and the next birthday, use age-calc.
- How are the 100-day and 1-year marks computed?
- 100 days = start date + 100 calendar days. Yearly marks reuse the same month/day; if the start is Feb 29 and the target year is non-leap, it falls back to Feb 28.
- Is the per-second tick heavy?
- No — it's just a setInterval (1000ms) that re-renders local values. No network calls or heavy work happens.
- What if I enter a future start date?
- You'll see an error. This tool measures elapsed time only; for a countdown to a future date use the countdown tool.
- What gets copied?
- Each value copies verbatim — e.g. 『3 years 2 months 15 days』 or 『1175 days』.
Related tools
Age calculator — from birthday to years, zodiac & day count
Enter a birth date and a reference date to get the full age in years, days lived, Eastern zodiac (12 animals), and Western zodiac. Change the reference date to compute the age at any past or future point. Everything runs inside your browser — your birthday never leaves the page.
Date difference calculator — days / weeks / months / years
Compute the gap between two dates in days, weeks, business days, a years-months-days breakdown, and (optionally) hours/minutes/seconds. Toggle inclusivity and time-of-day with a checkbox. Everything runs inside your browser.
Countdown / count-up timer — time left or elapsed until target date
Real-time display of the remaining time until (countdown) or the elapsed time since (count-up) a target date. Days / hours / minutes / seconds tick every second. Copy the URL to share the current setup (?to=datetime&mode=countdown). Uses your browser's local timezone. Runs entirely in your browser — the target datetime never leaves your device.
China business-day calculator — Spring Festival, National Day, 调休 makeup days
Compute the date that is N business days before or after a given date, skipping Chinese public holidays (New Year, Spring Festival, Qingming, Labour Day, Dragon Boat, Mid-Autumn, National Day) and weekends. Honours 调休 (makeup work-days) — weekends officially designated as working days to bridge long holidays. Data follows the State Council's published 2024 and 2025 schedules; 2026 is an approximation pending official notice. Runs entirely in your browser.