Solar and lunar calendar dates are often different.
Tips
usage
Contrast 阳历 (solar/Gregorian) with 农历 (nónglì, agricultural/lunar calendar) or 阴历 (yīnlì, lunar calendar). When a Chinese person asks 你生日几号, always clarify whether they mean 阳历 or 农历.
memory
阳 (yang, sun) + 历 (calendar) = sun-based calendar. The opposite, 阴历 (yīnlì), uses 阴 (yin, moon) for the lunar calendar.
