Datetime

Expiration Date Calculator

Calculate the expiration date based on the production date and shelf life, or check the near-expiry and expired status based on the expiration date.

Age Calculator (Western, Chinese & Lunar)

Enter your birth date to instantly calculate your exact age, traditional Chinese age, and total days alive, plus find your Chinese zodiac, horoscope, and lunar birthday.

100 Day Calculator (Baby's Hundred Days)

Enter your baby's birth date to instantly view the Gregorian and Lunar dates, as well as the day of the week, for their one-month, 100-day, and first birthday milestones. Perfect for planning your celebrations.

Bazi to Gregorian Calendar Converter

Free online two-way converter for Gregorian dates and Bazi (Four Pillars of Destiny). Supports Ziwei and Ziping school Rat hour (Zi hour) rules for accurate Chinese astrology calculations and calendar conversions.

Lunar and Solar Calendar Converter

A tool for converting dates between the lunar and solar calendars. It supports lunar leap months and is ideal for looking up holidays, birthdays, or historical dates.

First Seven Mourning Date Calculator

Accurately calculate traditional memorial dates including the First Seven, Third Seven, Fifth Seven, and Seventh Seven. Supports both Lunar and Gregorian calendar inputs to help families follow traditional mourning customs.

Countdown Calculator

Calculate the exact countdown to any future date. Supports both Gregorian and Lunar calendars, displaying the remaining weeks, days, hours, minutes, and seconds.

Day of the Year Calculator

Quickly calculate the day of the year, days remaining, and convert between lunar and solar calendars.

Date Difference Calculator

Accurately calculate the time difference between two dates. Get results in years, months, weeks, days, hours, minutes, and seconds. Perfect for project management, countdowns, and anniversaries.

Death Anniversary Calculator

Automatically calculate important memorial milestones like the 1st and 3rd death anniversaries. Supports Gregorian and Lunar calendar conversions for easy memorial planning.

UNIX Timestamp Converter

Instantly convert between human-readable dates and UNIX timestamps (seconds/milliseconds). Perfect for development, debugging, and data processing.

Leap Year Calculator

Check if a year is a leap year based on Gregorian calendar rules, or generate a list of all leap years within a specific time range.

Historical Events Lookup

Look up major historical events and famous figures for any date.

Date Calculator: Add or Subtract Days

Add or subtract years, months, weeks, and days from a specific date to quickly calculate your target date.

Lunar New Year's Eve Countdown

Live countdown displaying the exact days and time left until Lunar New Year's Eve to help you prepare for the Spring Festival.

Flip Clock

Large-digit flip clock to boost focus during work and study. Features full-screen mode and customizable time formats.

Chinese New Year Countdown

Real-time countdown calculating the exact days, hours, minutes, and seconds until the Lunar New Year. No manual input required, automatically updates for the next Spring Festival.

Christmas Countdown

Accurately calculate the remaining days, hours, minutes, and seconds until Christmas. An essential tool for your holiday planning.

New Year's Day Countdown

Accurately calculates the countdown to January 1st of the upcoming year, with real-time updates for days, hours, minutes, and seconds.

Confucius Birthday Countdown

Automatically calculate the days remaining until September 28 to celebrate Confucian culture.