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Quickly calculate the day of the year, days remaining, and convert between lunar and solar calendars.
Baby 100 Days Calculator
Calculate the exact Gregorian and Lunar dates, along with the day of the week, for your baby's 1-month, 100-day, and 1-year milestones based on their birth date.
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.
SHAKE Hash Generator
Variable-length hash generator for SHAKE-128/256, featuring salt support, multiple iterations, and various input/output formats.
Bazi to Gregorian Calendar Converter
A two-way Bazi and Gregorian calendar converter with Late Rat Hour (Zi Shi) rule options, designed for Chinese astrology and calendar calculations.
Baby 100 Days Calculator
Calculate the exact Gregorian and Lunar dates, along with the day of the week, for your baby's 1-month, 100-day, and 1-year milestones based on their birth date.
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.
SHAKE Hash Generator
Variable-length hash generator for SHAKE-128/256, featuring salt support, multiple iterations, and various input/output formats.
Bazi to Gregorian Calendar Converter
A two-way Bazi and Gregorian calendar converter with Late Rat Hour (Zi Shi) rule options, designed for Chinese astrology and calendar calculations.
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.
Still struggling to figure out a date's exact position in the year? By entering any date (supporting both solar and lunar calendars), the Day of the Year Calculator instantly outputs the corresponding solar and lunar dates, the day of the year (cumulative days starting from January 1st), and the days remaining in the year. The "day of the year" metric is essential for project scheduling and date analysis.
When entering a lunar date, it is recommended to include the year (e.g., "Lunar August 15, 2025") to avoid deviations caused by defaulting to the current year. The tool processes one date at a time and does not support batch calculations. The resulting data does not include time zone adjustments.
When planning cross-year projects, we recommend using the "days remaining" field to work backward for milestones. For example, October 1, 2024, is the 275th day of the year (with 91 days remaining), which can help you evaluate Q4 progress. Leap year example: February 29, 2024 = the 60th day of the year, whereas the same date in 2023 is invalid.
