c# 根据当前日期获取开始日期和最后日期

Question

我正在做一个基于日期的事件监视器，类似于 stackoverflow Today,YesterDay,this week,Last week,this month,last Month..... 基于当前日期如何在 C# 中获取所有这些 Today,YesterDay,this week,Last week,this month,last Month 的 start-date 和 end-date？

Answer 1

DateTime baseDate = DateTime.Today;

var today = baseDate;
var yesterday = baseDate.AddDays(-1);
var thisWeekStart = baseDate.AddDays(-(int)baseDate.DayOfWeek);
var thisWeekEnd = thisWeekStart.AddDays(7).AddSeconds(-1);
var lastWeekStart = thisWeekStart.AddDays(-7);
var lastWeekEnd = thisWeekStart.AddSeconds(-1);
var thisMonthStart = baseDate.AddDays(1 - baseDate.Day);
var thisMonthEnd = thisMonthStart.AddMonths(1).AddSeconds(-1);
var lastMonthStart = thisMonthStart.AddMonths(-1);
var lastMonthEnd = thisMonthStart.AddSeconds(-1);