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Vietnamese Lunar Calendar for .NET

, 18 May 2012
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Implementation of Âm lịch Việt Nam for Microsoft.NET

Introduction  

This is an implementation of Am lich VN (http://www.informatik.uni-leipzig.de/~duc/amlich/) in C# / .NET 2.0. It's useful to calculate the Vietnamese lunar date in a .NET application (and I hope this source code may be used as a build-in for the Microsoft .NET Framework).

Background

This article uses the algorithm of author Ho Ngoc Duc (http://www.informatik.uni-leipzig.de/~duc/) to make a VietnameseCalendar class (it's similar to the ChineseLunarCalendar class - a build-in of Microsoft .NET 2.0).

Using the Code

You may use this class to convert a solar date (Gregorian calendar) to a Vietnamese lunar date and vice versa.

// From VN lunar date to solar date
DateTime d = new DateTime(2008, 9, 1, new VietnameseCalendar());
Console.WriteLine("Solar date of Vietnam New Year - Mau Ty = '{0}'", d);   
// From solar date to VN lunar date
VietnameseCalendar vCal = new VietnameseCalendar();
DateTime dt = new DateTime(2008, 9, 30);
vCal.FromDateTime(dt, out y, out m, out d);
Console.WriteLine("VN lunar date of 2008/9/30 = 'Nam {0} - {1}({1}) - Ngay {3} ({4})
 - Gio bat dau: {5} - Tiet {6}, Gio Hoang dao: {7}",
  VietnameseCalendar.GetYearName(y),
  VietnameseCalendar.GetMonthSpeechName(y, m),
  VietnameseCalendar.GetMonthName(y, m),
  d, VietnameseCalendar.GetDayName(dt),
  VietnameseCalendar.GetHourZeroName(dt),
  VietnameseCalendar.GetMinorSolarTerms(dt),
  VietnameseCalendar.GetPropitiousHour(dt));      

* You can use this class to get VN lunar start hour of a day; or get Minor solar terms; Propitious hours in a day,... 

* A Vietnam lunar month can be 1 to 13 (because of leap-month) as a numeric. Example:
   VN Lunar year 1979 has leap-month: 6
   So this year has 13 months (from 1 to 13, as an int) like:
    [1], [2] ... [5], [6], [7 => 6(N)], [8 (=> 7)], [9] ... [13]
   So, if you convert 1979-9-17, you will received 1979/8/26 as output numbers, but string will be "26, Tháng Bảy, Năm Kỷ Mùi" (if you use the method: GetMonthSpeechName(y, m))

Points of Interest

This class has been tested by unit-testing (in the attached file). Here is that class diagram:

VietnameseCalendar_dotnet2_src

History 

  • 16th October, 2008: Initial post

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

About the Author

nthachus
Software Developer (Junior)
Vietnam Vietnam
No Biography provided

Comments and Discussions

 
QuestionBug Pinmemberphamthaihoa28-Feb-14 22:17 
QuestionThanks Pinmemberaspneter26-May-12 8:19 
QuestionWrong date when you convert in a lunar leap year PinmemberNguyen Vu Thuy10-May-12 20:23 
AnswerRe: Wrong date when you convert in a lunar leap year Pinmembernthachus11-May-12 6:34 
AnswerRe: Wrong date when you convert in a lunar leap year Pinmembernthachus18-May-12 11:55 
AnswerRe: Wrong date when you convert in a lunar leap year Pinmemberwentou18-May-12 21:48 
The magic of a site!!!
GeneralError when convert to Lunar date PinmemberiSoftVN8-Jun-09 17:24 
GeneralRe: Error when convert to Lunar date Pinmembernthachus18-May-12 12:08 
QuestionLeap Year 2009 Pinmemberada260324827-Apr-09 0:32 
AnswerRe: Leap Year 2009 Pinmembernthachus11-May-12 6:38 
AnswerRe: Leap Year 2009 Pinmembernthachus18-May-12 12:03 
GeneralThanks Pinmemberphamthaihoa25-Apr-09 0:37 
GeneralThank you Pinmemberbienca9-Feb-09 15:37 

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