C# 如何在asp.net中获取上个月的日期
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How to get the previous month date in asp.net
提问by Optimus
I need to get the previous months date in asp.net which means that if the current date is 5/2/2013 then I want to display the previous date as 5/1/2013. How to solve this?
我需要在asp.net 中获取上个月的日期，这意味着如果当前日期是2013 年5 月2 日，那么我想将上一个日期显示为2013 年5 月1 日。如何解决这个问题？
采纳答案by Iswanto San
Try this :
尝试这个 ：
DateTime d = DateTime.Now;
d = d.AddMonths(-1);
回答by dutzu
The solution is to substract 1 month:
解决办法是减去1个月：
DateTime.Now.AddMonths(-1)
Or if not just build the datetime object from scratch:
或者，如果不只是从头开始构建 datetime 对象：
var previousDate = DateTime.Now.AddMonth(-1);
var date = new DateTime(previousDate.Year, previousDate.Month, DateTime.Now.Day);
this time you are guaranteed that the year and month are correct and the day stays the same. (although this is not a safe algorithm due to cases like the 30th of march and the previous date should be 28/29th of February, so better go with the first sugeestion of substracting a month)
这一次，您可以保证年份和月份是正确的，并且日期保持不变。（尽管由于 3 月 30 日这样的情况，这不是一个安全的算法，而前一个日期应该是 2 月 28 日/29 日，所以最好使用减去一个月的第一次建议）
回答by Varinder Singh
If you already have date time in string format
如果您已经有字符串格式的日期时间
var strDate = "5/1/2013";
var dateTime = DateTime.ParseExact(strDate,
"dd/MM/yyyy",
CultureInfo.InvariantCulture);
var lastMonthDateTime = dateTime.AddMonths(-1);
else if you have DateTimeobject just call it's AddMonths(-1)method.
否则如果你有DateTime对象就调用它的AddMonths(-1)方法。
