月初的第一天:
System.DateTime.Today.AddDays(1 - System.DateTime.Today.Day);
月末的最后一天 :
System.DateTime.Now.AddDays(1 - System.DateTime.Now.Day).AddMonths(1).AddDays(-1);
月初的第一天:
System.DateTime.Today.AddDays(1 - System.DateTime.Today.Day);
月末的最后一天 :
System.DateTime.Now.AddDays(1 - System.DateTime.Now.Day).AddMonths(1).AddDays(-1);
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