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Overview
Comment:Attempt to fix date/time calculations for days earlier than 0400-03-01. See forum thread eaa0a09786c6368b.
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Timelines: family | ancestors | descendants | both | ancient-date-fix
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SHA3-256: 00cae11fffaf50e2133915e851d41098d00b6b1458e1438bcb6664e1411d8498
User & Date: drh 2024-08-19 12:54:12
Context
2024-08-19
13:53
New date/time test cases to validate ancient dates. (Closed-Leaf check-in: 82719074 user: drh tags: ancient-date-fix)
12:54
Attempt to fix date/time calculations for days earlier than 0400-03-01. See forum thread eaa0a09786c6368b. (check-in: 00cae11f user: drh tags: ancient-date-fix)
2024-08-18
09:53
Automatically disable directory fsync when compiling for AIX. (check-in: 8d170e07 user: drh tags: trunk)
Changes
Unified Diff Ignore Whitespace Patch
Changes to src/date.c.
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    datetimeError(p);
    return;
  }
  if( M<=2 ){
    Y--;
    M += 12;
  }
  A = Y/100;
  B = 2 - A + (A/4);
  X1 = 36525*(Y+4716)/100;
  X2 = 306001*(M+1)/10000;
  p->iJD = (sqlite3_int64)((X1 + X2 + D + B - 1524.5 ) * 86400000);
  p->validJD = 1;
  if( p->validHMS ){
    p->iJD += p->h*3600000 + p->m*60000 + (sqlite3_int64)(p->s*1000 + 0.5);
    if( p->tz ){








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    datetimeError(p);
    return;
  }
  if( M<=2 ){
    Y--;
    M += 12;
  }
  A = (Y+4800)/100;
  B = 38 - A + (A/4);
  X1 = 36525*(Y+4716)/100;
  X2 = 306001*(M+1)/10000;
  p->iJD = (sqlite3_int64)((X1 + X2 + D + B - 1524.5 ) * 86400000);
  p->validJD = 1;
  if( p->validHMS ){
    p->iJD += p->h*3600000 + p->m*60000 + (sqlite3_int64)(p->s*1000 + 0.5);
    if( p->tz ){
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  return iJD>=0 && iJD<=INT_464269060799999;
}

/*
** Compute the Year, Month, and Day from the julian day number.
*/
static void computeYMD(DateTime *p){
  int Z, A, B, C, D, E, X1;
  if( p->validYMD ) return;
  if( !p->validJD ){
    p->Y = 2000;
    p->M = 1;
    p->D = 1;
  }else if( !validJulianDay(p->iJD) ){
    datetimeError(p);
    return;
  }else{
    Z = (int)((p->iJD + 43200000)/86400000);
    A = (int)((Z - 1867216.25)/36524.25);
    A = Z + 1 + A - (A/4);
    B = A + 1524;
    C = (int)((B - 122.1)/365.25);
    D = (36525*(C&32767))/100;
    E = (int)((B-D)/30.6001);
    X1 = (int)(30.6001*E);
    p->D = B - D - X1;
    p->M = E<14 ? E-1 : E-13;








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  return iJD>=0 && iJD<=INT_464269060799999;
}

/*
** Compute the Year, Month, and Day from the julian day number.
*/
static void computeYMD(DateTime *p){
  int Z, alpha, A, B, C, D, E, X1;
  if( p->validYMD ) return;
  if( !p->validJD ){
    p->Y = 2000;
    p->M = 1;
    p->D = 1;
  }else if( !validJulianDay(p->iJD) ){
    datetimeError(p);
    return;
  }else{
    Z = (int)((p->iJD + 43200000)/86400000);
    alpha = (int)((Z + 32044.75)/36524.25) - 52;
    A = Z + 1 + alpha - ((alpha+100)/4) + 25;
    B = A + 1524;
    C = (int)((B - 122.1)/365.25);
    D = (36525*(C&32767))/100;
    E = (int)((B-D)/30.6001);
    X1 = (int)(30.6001*E);
    p->D = B - D - X1;
    p->M = E<14 ? E-1 : E-13;
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