我想使用c#将julian日期(YYJJJ格式)转换为任何常规日期格式(MMDDYY).是否有为此定义的功能? [英] I want to covert julian date(YYJJJ format) to any normal date format(MMDDYY) using c#. Is there any defined function for that?

问题描述

我有儒略历字符串 YYJJJ 格式.例如 05365 (2005年12月31日).我想转换为 MMDDYY 格式( 123105 ).

Hi I have julian date string YYJJJ format. eg 05365(31st dec 2005). I want to covert to MMDDYY format(123105).

里面有定义的功能吗?

推荐答案

首先，没有 YY ， JJJ 和 DD 格式为自定义日期和时间格式.一种解决方案可能是将字符串 Year 和 JulianCalendar 类./p>

First of all, there is no YY, JJJ and DD formats as a custom date and time format. One solution might be to split your string Year and DayOfYear part and create a DateTime with JulianCalendar class.

string s = "05365";
int year = Convert.ToInt32(s.Substring(0, 2));
// Get year part from your string
int dayofyear = Convert.ToInt32(s.Substring(2));
// Get day of years part from your string
DateTime dt = new DateTime(1999 + year, 12, 18, new JulianCalendar());
// Initialize a new DateTime one day before year value. 
// Added 1999 to year part because it makes 5 AD as a year if we don't.
// In our case, it is 2004/12/31
dt = dt.AddDays(dayofyear);
// Since we have a last day of one year before, we can add dayofyear to get exact date

我在12月18日初始化了此 new DateTime(.. "部分，因为

I initialized this new DateTime(.. part with 18th December because

来自朱利安日历

因此，儒略历现在比日历晚了 13 天.公历;例如，儒略历中的1月1日是1月14日在公历.

Consequently, the Julian calendar is currently 13 days behind the Gregorian calendar; for instance, 1 January in the Julian calendar is 14 January in the Gregorian.

您可以像这样设置 dt 格式；

And you can format your dt like;

dt.ToString("MMddyy", CultureInfo.InvariantCulture) //123105

老实说，我不喜欢这种方式，但这是我能想到的唯一解决方案.

I honestly didn't like this way but this is the only one I can imagine as a solution.

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