日期计算与农历转换 / Date Calculator and Lunar Converter

选择两个日期并点击计算，可查看日期间隔。切换到日期推算，输入起始日期和天数；切换到农历转换，可在公历和农历之间换算。

Select two dates and calculate their interval. Use Calculate Date to add or subtract a number of days. Use Solar/Lunar to convert between Gregorian and lunar dates.