将年份从4位数转换为2位数，然后在C#中再次返回 [英] Converting a year from 4 digit to 2 digit and back again in C#

问题描述

我的信用卡处理器要求我从信用卡到期日起发送两位数的年份.这是我目前正在处理的方式:

My credit card processor requires I send a two-digit year from the credit card expiration date. Here is how I am currently processing:

1. 我在页面上输入了四位数年份的DropDownList.
2. 我在DateTime字段中验证到期日期，以确保传递给CC处理器的到期日期没有到期.
3. 我将两位数字的年份发送给CC处理器(根据需要).我通过DDL年的值的子字符串来完成此操作.

1. I put a DropDownList of the 4-digit year on the page.
2. I validate the expiration date in a DateTime field to be sure that the expiration date being passed to the CC processor isn't expired.
3. I send a two-digit year to the CC processor (as required). I do this via a substring of the value from the year DDL.

有没有一种方法可以将四位数的年份转换为两位数的年份.我没有在DateTime对象上看到任何东西.还是我应该继续处理它?<​​/p>

Is there a method out there to convert a four-digit year to a two-digit year. I am not seeing anything on the DateTime object. Or should I just keep processing it as I am?

推荐答案

如果要使用到期日期(月/年)创建DateTime对象，则可以在DateTime变量上使用ToString()，如下所示:

If you're creating a DateTime object using the expiration dates (month/year), you can use ToString() on your DateTime variable like so:

DateTime expirationDate = new DateTime(2008, 1, 31); // random date
string lastTwoDigitsOfYear = expirationDate.ToString("yy");

如果在验证期间使用DateTime对象，请注意日期.如果有人选择05/2008作为卡的失效日期，则失效日期为5月底，而不是第一天.

Be careful with your dates though if you use the DateTime object during validation. If somebody selects 05/2008 as their card's expiration date, it expires at the end of May, not on the first.

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