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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.
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If a baby is born on August 15, 2024, their "100th day" falls on November 22, 2024 (the 22nd day of the 10th month in the Lunar Year of the Dragon). It sounds simple, but manually calculating the Gregorian date and day of the week is prone to errors. With this calculator, you can get the complete and accurate milestone information in just half a minute.
The "100 Days" refers to the 100th day after a baby's birth, an important traditional milestone in China and parts of East Asia. In the past, when medical conditions were limited, surviving the first three months meant the baby had passed the most vulnerable stage. Families would host banquets to celebrate, calling it "Baisui" or "Baizui." Today, many families still take 100-day photos, hold small gatherings, and choose auspicious days based on the lunar calendar. This calculator converts this traditional milestone into exact Gregorian and Lunar dates, as well as the day of the week, saving you the hassle of flipping through a calendar.
The core logic of this tool is very simple:
Milestone Date = Birth Date + Fixed Number of Days (or Years)
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.
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Age Calculator
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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.
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.
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.
Age Calculator
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.
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.
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.
