给定日期，获取星期几 - SYSTEMTIME [英] Given Date, Get Day of Week - SYSTEMTIME

问题描述

如果提供日期（月 - 日 - 年），或者此结构是单向的，那么可以使用SYSTEMTIME确定星期几？

解决方案

如果SYSTEMTIME无法做到这一点，根据 msdn ，当将 SYSTEMTIME 转换为 FILETIME 时，将忽略wDayOfWeek 成员。

  SYSTEMTIME t = {2010，6，-1 / * ignored * /，11} ; 
 FILETIME ft; 
 HRESULT hrto = SystemTimeToFileTime（& t，& ft）; 
 HRESULT hrback = FileTimeToSystemTime（& ft，& t）; 
 
 WORD dayofweek = t.wDayOfWeek; 
  

Is it possible to determine the day of the week, using SYSTEMTIME, if a date (month-day-year) is provided or is this structure one-way only?

What is the most lightweight way to accomplish what I am asking if SYSTEMTIME cannot do it (using Win32)?

解决方案

According to the msdn, the wDayOfWeek member is ignored when converting SYSTEMTIME to FILETIME. When converting back, it's filled in.

SYSTEMTIME t = { 2010, 6, -1 /*ignored*/, 11 };
FILETIME ft;
HRESULT hrto   = SystemTimeToFileTime( &t, &ft );
HRESULT hrback = FileTimeToSystemTime( &ft, &t );

WORD dayofweek = t.wDayOfWeek;

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