Age and zodiac

How it works

• (Age on this date + Reference time) − (Date of birth + Birth time (optional)) → Completed years, Additional months, Remaining days
• Completed years → Additional months → Remaining days → Remaining hours → Remaining minutes → Remaining seconds
• Whole weeks = floor(Total days ÷ 7)
• Chinese zodiac animal: Western signs use approximate conventional date ranges. Chinese animals use Lunar New Year, not January 1 or Spring Commences.
• Aquarius: 01-20–02-18; Pisces: 02-19–03-20; Aries: 03-21–04-19; Taurus: 04-20–05-20; Gemini: 05-21–06-20; Cancer: 06-21–07-22; Leo: 07-23–08-22; Virgo: 08-23–09-22; Libra: 09-23–10-22; Scorpio: 10-23–11-21; Sagittarius: 11-22–12-21; Capricorn: 12-22–01-19
• UTC is the default. Calendar age follows the birth timezone; elapsed seconds use actual instants and daylight-saving offsets. An anniversary in a clock gap shifts forward by the gap. Regional timezone rules come from your browser and can change.
• Use UTC for dates before 1900. Regional clock history is outside this tool’s scope.
• Worked example: For a birth date of 2000-01-15 and a reference date of 2026-04-20, use midnight UTC for both. The completed calendar age is 26 years, 3 months and 5 days; changing the reference date changes this example.
• 2000-01-15 → 2026-01-15 → 2026-04-15 → 2026-04-20.