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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)

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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 
GeneralError when convert to Lunar date PinmemberiSoftVN8-Jun-09 17:24 
Hello, I'm using this Class to convert my DOB to Lunar date, but It's wrong. I'm change from dd/mm/yyyy (06/07/1982) to Lunar date. Your Class In convert to dd/mm/yyyy 16/06/1982, But my DBO in Lunar date is 16/05/1982
 
Chào bạn, mình sử dụng để đổi ngày sinh mình thì kết quả không đúng. Mình đổi ngày 6 tháng 7 năm 1982 sang ngày âm lịch, thì KQ lại cho ra là 16/06/1982, nhưng thật sự đúng ra phải là 16/05/1982
 
Mình sử dụng hàm - Using
 
VietnameseCalendar cal = new VietnameseCalendar();
int intLunarDate;
int intLunarMonth;
int intLunarYear;
cal.FromDateTime(new DateTime(1982, 7, 6), out intLunarYear, out intLunarMonth, out intLunarDate);
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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