datecn.pas

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///DELPHI 的代码 ,可以在 C++ Builder 中编译。 


unit DateCn;


interface


uses Windows, SysUtils, Controls;


const

  // 农历月份数据 ,每年 4 字节 ,从 1901 年开始 ,共 150 年 

  // 数据来源 :UCDOS 6.0 UCT.COM

  // 分析整理 :Copyright (c) 1996-1998, Randolph

  // 数据解析 :

  // 如果第一字节的 bit7 为 1,则该年 1 月 1 日位于农历 12 月 ,否则位于 11 月 

  // 第一字节去除 bit7 为该年 1 月 1 日的农历日期 

  //         第二字节                  第三字节 

  //bit:    7  6  5  4  3  2  1  0  7  6  5  4  3  2  1  0

  // 农历月份 :16 15 14 13 12 11 10 9  8  7  6  5  4  3  2  1

  // 农历月份指的是从该年 1 月 1 日的农历月份算起的顺序号 

  // 农历月份对应的 bit 为 1 则该月为 30 日 ,否则为 29 日 

  // 第四字节为闰月月份 

  CnData: array[0..599] of Byte = (

    $0b,$52,$ba,$00,$16,$a9,$5d,$00,$83,$a9,$37,$05,$0e,$74,$9b,$00,

    $1a,$b6,$55,$00,$87,$b5,$55,$04,$11,$55,$aa,$00,$1c,$a6,$b5,$00,

    $8a,$a5,$75,$02,$14,$52,$ba,$00,$81,$52,$6e,$06,$0d,$e9,$37,$00,

    $18,$74,$97,$00,$86,$ea,$96,$05,$10,$6d,$55,$00,$1a,$35,$aa,$00,

    $88,$4b,$6a,$02,$13,$a5,$6d,$00,$1e,$d2,$6e,$07,$0b,$d2,$5e,$00,

    $17,$e9,$2e,$00,$84,$d9,$2d,$05,$0f,$da,$95,$00,$19,$5b,$52,$00,

    $87,$56,$d4,$04,$11,$4a,$da,$00,$1c,$a5,$5d,$00,$89,$a4,$bd,$02,

    $15,$d2,$5d,$00,$82,$b2,$5b,$06,$0d,$b5,$2b,$00,$18,$ba,$95,$00,

    $86,$b6,$a5,$05,$10,$56,$b4,$00,$1a,$4a,$da,$00,$87,$49,$ba,$03,

    $13,$a4,$bb,$00,$1e,$b2,$5b,$07,$0b,$72,$57,$00,$16,$75,$2b,$00,

    $84,$6d,$2a,$06,$0f,$ad,$55,$00,$19,$55,$aa,$00,$86,$55,$6c,$04,

    $12,$c9,$76,$00,$1c,$64,$b7,$00,$8a,$e4,$ae,$02,$15,$ea,$56,$00,

    $83,$da,$55,$07,$0d,$5b,$2a,$00,$18,$ad,$55,$00,$85,$aa,$d5,$05,

    $10,$53,$6a,$00,$1b,$a9,$6d,$00,$88,$a9,$5d,$03,$13,$d4,$ae,$00,

    $81,$d4,$ab,$08,$0c,$ba,$55,$00,$16,$5a,$aa,$00,$83,$56,$aa,$06,

    $0f,$aa,$d5,$00,$19,$52,$da,$00,$86,$52,$ba,$04,$11,$a9,$5d,$00,

    $1d,$d4,$9b,$00,$8a,$74,$9b,$03,$15,$b6,$55,$00,$82,$ad,$55,$07,

    $0d,$55,$aa,$00,$18,$a5,$b5,$00,$85,$a5,$75,$05,$0f,$52,$b6,$00,

    $1b,$69,$37,$00,$89,$e9,$37,$04,$13,$74,$97,$00,$81,$ea,$96,$08,

    $0c,$6d,$52,$00,$16,$2d,$aa,$00,$83,$4b,$6a,$06,$0e,$a5,$6d,$00,

    $1a,$d2,$6e,$00,$87,$d2,$5e,$04,$12,$e9,$2e,$00,$1d,$ec,$96,$0a,

    $0b,$da,$95,$00,$15,$5b,$52,$00,$82,$56,$d2,$06,$0c,$2a,$da,$00,

    $18,$a4,$dd,$00,$85,$a4,$bd,$05,$10,$d2,$5d,$00,$1b,$d9,$2d,$00,

    $89,$b5,$2b,$03,$14,$ba,$95,$00,$81,$b5,$95,$08,$0b,$56,$b2,$00,

    $16,$2a,$da,$00,$83,$49,$b6,$05,$0e,$64,$bb,$00,$19,$b2,$5b,$00,

    $87,$6a,$57,$04,$12,$75,$2b,$00,$1d,$b6,$95,$00,$8a,$ad,$55,$02,

    $15,$55,$aa,$00,$82,$55,$6c,$07,$0d,$c9,$76,$00,$17,$64,$b7,$00,

    $86,$e4,$ae,$05,$11,$ea,$56,$00,$1b,$6d,$2a,$00,$88,$5a,$aa,$04,

    $14,$ad,$55,$00,$81,$aa,$d5,$09,$0b,$52,$ea,$00,$16,$a9,$6d,$00,

    $84,$a9,$5d,$06,$0f,$d4,$ae,$00,$1a,$ea,$4d,$00,$87,$ba,$55,$04,

    $12,$5a,$aa,$00,$1d,$ab,$55,$00,$8a,$a6,$d5,$02,$14,$52,$da,$00,

    $82,$52,$ba,$06,$0d,$a9,$3b,$00,$18,$b4,$9b,$00,$85,$74,$9b,$05,

    $11,$b5,$4d,$00,$1c,$d6,$a9,$00,$88,$35,$aa,$03,$13,$a5,$b5,$00,

    $81,$a5,$75,$0b,$0b,$52,$b6,$00,$16,$69,$37,$00,$84,$e9,$2f,$06,

    $10,$f4,$97,$00,$1a,$75,$4b,$00,$87,$6d,$52,$05,$11,$2d,$69,$00,

    $1d,$95,$b5,$00,$8a,$a5,$6d,$02,$15,$d2,$6e,$00,$82,$d2,$5e,$07,

    $0e,$e9,$2e,$00,$19,$ea,$96,$00,$86,$da,$95,$05,$10,$5b,$4a,$00,

    $1c,$ab,$69,$00,$88,$2a,$d8,$03);


  function CnMonthOfDate(Date: TDate): String;// 指定日期的农历月 

  function CnDayOfDate(Date: TDate): String;// 指定日期的农历日 

  function CnDateOfDateStr(Date: TDate): String;// 指定日期的农历日期 


implementation


// 日期是该年的第几天 ,1 月 1 日为第一天 

function DaysNumberOfDate(Date: TDate): Integer;

var

  DaysNumber: Integer;

  I: Integer;

  yyyy, mm, dd: Word;

begin

  DecodeDate(Date, yyyy, mm, dd);

  DaysNumber := 0;

  for I := 1 to mm - 1 do

    Inc(DaysNumber, MonthDays[IsLeapYear(yyyy), I]);

  Inc(DaysNumber, dd);

  Result := DaysNumber;

end;


// 日期的农历日期 ,返回农历格式 : 月份 *100 +  日 ,负数为闰月 

// 超出范围则返回 0

function CnDateOfDate(Date: TDate): Integer;

var

  CnMonth, CnMonthDays: array[0..15] of Integer;


  CnBeginDay, LeapMonth: Integer;

  yyyy, mm, dd: Word;

  Bytes: array[0..3] of Byte;

  I: Integer;

  CnMonthData: Word;

  DaysCount, CnDaysCount, ResultMonth, ResultDay: Integer;

begin

  DecodeDate(Date, yyyy, mm, dd);

  if (yyyy < 1901) or (yyyy > 2050) then

  begin

    Result := 0;

    Exit;

  end;

  Bytes[0] := CnData[(yyyy - 1901) * 4];

  Bytes[1] := CnData[(yyyy - 1901) * 4 + 1];

  Bytes[2] := CnData[(yyyy - 1901) * 4 + 2];

  Bytes[3] := CnData[(yyyy - 1901) * 4 + 3];

  if (Bytes[0] and $80) <> 0 then CnMonth[0] := 12

  else CnMonth[0] := 11;

  CnBeginDay := (Bytes[0] and $7f);

  CnMonthData := Bytes[1];

  CnMonthData := CnMonthData shl 8;

  CnMonthData := CnMonthData or Bytes[2];

  LeapMonth := Bytes[3];


  for I := 15 downto 0 do

  begin

    CnMonthDays[15 - I] := 29;

    if ((1 shl I) and CnMonthData) <> 0 then

      Inc(CnMonthDays[15 - I]);

    if CnMonth[15 - I] = LeapMonth then

      CnMonth[15 - I + 1] := - LeapMonth

    else

    begin

      if CnMonth[15 - I] < 0 then // 上月为闰月 

        CnMonth[15 - I + 1] := - CnMonth[15 - I] + 1

      else CnMonth[15 - I + 1] := CnMonth[15 - I] + 1;

      if CnMonth[15 - I + 1] > 12 then CnMonth[15 - I + 1] := 1;

    end;

  end;


  DaysCount := DaysNumberOfDate(Date) - 1;

  if DaysCount <= (CnMonthDays[0] - CnBeginDay) then

  begin

    if (yyyy > 1901) and

      (CnDateOfDate(EncodeDate(yyyy - 1, 12, 31)) < 0) then

      ResultMonth := - CnMonth[0]

    else ResultMonth := CnMonth[0];

    ResultDay := CnBeginDay + DaysCount;

  end

  else

  begin

    CnDaysCount := CnMonthDays[0] - CnBeginDay;

    I := 1;

    while (CnDaysCount < DaysCount) and

      (CnDaysCount + CnMonthDays[I] < DaysCount) do

    begin

      Inc(CnDaysCount, CnMonthDays[I]);

      Inc(I);

    end;

    ResultMonth := CnMonth[I];

    ResultDay := DaysCount - CnDaysCount;

  end;

  if ResultMonth > 0 then

    Result := ResultMonth * 100 + ResultDay

  else Result := ResultMonth * 100 - ResultDay

end;


function CnMonthOfDate(Date: TDate): String;

const

  CnMonthStr: array[1..12] of String = (

    '一', '二', '三', '四', '五', '六', '七', '八', '九', '十',

    '冬', '蜡');

var

  Month: Integer;

begin

  Month := CnDateOfDate(Date) div 100;

  if Month < 0 then Result := '闰' + CnMonthStr[-Month]

  else Result := CnMonthStr[Month] + '月';

end;


function CnDayOfDate(Date: TDate): String;

const

  CnDayStr: array[1..30] of String = (

        '初一','初二','初三','初四','初五',

        '初六','初七','初八','初九','初十',

        '十一','十二','十三','十四','十五',

        '十六','十七','十八','十九','二十',

        '廿一','廿二','廿三','廿四','廿五',

        '廿六','廿七','廿八','廿九','三十');

var

  Day: Integer;

begin

  Day := Abs(CnDateOfDate(Date)) mod 100;

  Result := CnDayStr[Day];

end;


function CnDateOfDateStr(Date: TDate): String;

begin
  Result := CnMonthOfDate(Date) + CnDayOfDate(Date);
end;

end.