in China, there is a scheme as https://en.wikipedia.org/wiki/Public_holidays_in_China#Weekend_shifting_scheme_(since_2014) when in long vocation, Sunday may become workday. `IsWorkDay` judge weekday before holiday. it may not work for China
in China, there is a scheme as https://en.wikipedia.org/wiki/Public_holidays_in_China#Weekend_shifting_scheme_(since_2014)
when in long vocation, Sunday may become workday.
IsWorkDayjudge weekday before holiday.it may not work for China