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pmcgee

Pascal : date to longint and back

Jan 18th, 2022
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  1. function date_val(date : datestr) : longint;
  2. var d,m,y,f : longint;
  3.     e : integer;
  4.  
  5. begin
  6.   IF DATE='  /  /  ' THEN DATE:=FAR_AWAY_DATE;
  7.  
  8.   val(copy(date,1,2),d,e);
  9.   val(copy(date,4,2),m,e);
  10.   val(copy(date,7,2),y,e);
  11.  
  12.   if y>century_mark then y:=y+century1 else y:=y+century2;
  13.  
  14.   f:=(365*y) + d + (31*(m-1));
  15.  
  16.   if m<3 then begin
  17.     f:=f + trunc((y-1)/4) - trunc(0.75*(trunc((y-1)/100)+1));
  18.   end
  19.   else begin
  20.     f:=f - trunc(0.4*m+2.3) + trunc(y/4) - trunc(0.75*(trunc(y/100)+1));
  21.   end;
  22.  
  23.   date_val:=f;
  24. end;
  25.  
  26.  
  27. { ------------------------------------------------------------------------- }
  28.  
  29. (******************************************)
  30. (*** CONVERT numeric DATE TO string date  *)
  31. (******************************************)
  32. Function Date_Str (DateNum: longint) : Str8;
  33.  
  34. var
  35.    day,mon,year,temp,e : longint;
  36.    Dstr, Mstr, Ystr : String [2];
  37.    TempA, TempB, TempC: longint;
  38. begin
  39.  
  40.    TempA := DateNum + 68569;
  41.    TempB := 4 * TempA div 146097;
  42.    TempA := TempA - (146097 * TempB + 3) div 4;
  43.    Year  := 4000 * (TempA + 1) div 1461001;
  44.    TempC := Year;
  45.    TempA := TempA - (1461 * TempC div 4) + 31;
  46.    Mon   := 80 * TempA div 2447;
  47.    TempC := Mon;
  48.    Day   := TempA - (2447 * TempC div 80);
  49.    TempA := Mon div 11;
  50.    Mon   := Mon + 2 - (12 * TempA);
  51.    Year  := 100 * (TempB - 49) + Year + TempA;
  52.  
  53.    Str (Day :2,Dstr);
  54.    Str (Mon :2,Mstr);
  55.    If Year <= 1999
  56.     then Dec (Year,1900)
  57.     else Dec (Year,2000);
  58.  
  59.    Str (Year:2,Ystr);
  60.  
  61.    if Dstr [1] = ' ' then Dstr [1] := '0';
  62.    if Mstr [1] = ' ' then Mstr [1] := '0';
  63.    if Ystr [1] = ' ' then Ystr [1] := '0';
  64.  
  65.    {if Ystr='0' then Ystr:='00';}
  66.  
  67.    Date_Str := Dstr + '/' + Mstr + '/' + Ystr;
  68.                       { handle blank field }
  69.    if datenum = 0 then Date_Str := '  /  /  ';
  70.  
  71. end;
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