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Comment:Change the magic time-interval names that do truncate-to-same-month to be "mnth" and "yr" - "month" and "year" without the vowels.
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SHA3-256: 296b46c529d79385d7f4db2c789254a992c01ff66fe8ba6d3a3ce4aaac0203fb
User & Date: drh 2024-03-02 20:50:56
Context
2024-03-02
21:02
New date/time modifiers "mnth" and "yr" work like "month" and "year" but resolve day-of-month overflow by truncating rather than rolling over into the next month. Forum thread 232d1abb5d (check-in: 5d392c16 user: drh tags: trunk)
20:50
Change the magic time-interval names that do truncate-to-same-month to be "mnth" and "yr" - "month" and "year" without the vowels. (Closed-Leaf check-in: 296b46c5 user: drh tags: month-truncate)
13:38
Proof-of-concept for new time-interval operator "pg-month" and "pg-year" that use the truncate-to-month algorithm for month overflow instead of the wrap-to-next-month algorithm that is used by SQLite by default. (check-in: b606c096 user: drh tags: month-truncate)
Changes
Unified Diff Ignore Whitespace Patch
Changes to src/date.c.
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**            'NNN days'
**
** Where NNN is an arbitrary floating-point number and "days" can be one
** of several units of time.
*/
static const struct {
  u8 nName;           /* Length of the name */
  char zName[9];      /* Name of the transformation */
  float rLimit;       /* Maximum NNN value for this transform */
  float rXform;       /* Constant used for this transform */
} aXformType[] = {
  { 6, "second",   4.6427e+14,       1.0  },
  { 6, "minute",   7.7379e+12,      60.0  },
  { 4, "hour",     1.2897e+11,    3600.0  },
  { 3, "day",      5373485.0,    86400.0  },
  { 5, "month",    176546.0,   2592000.0  },

  { 4, "year",     14713.0,   31536000.0  },
  { 8, "pg-month", 176546.0,   2592000.0  },
  { 7, "pg-year",  14713.0,   31536000.0  },
};

/*
** If the DateTime p is raw number, try to figure out if it is
** a julian day number of a unix timestamp.  Set the p value
** appropriately.
*/








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**            'NNN days'
**
** Where NNN is an arbitrary floating-point number and "days" can be one
** of several units of time.
*/
static const struct {
  u8 nName;           /* Length of the name */
  char zName[7];      /* Name of the transformation */
  float rLimit;       /* Maximum NNN value for this transform */
  float rXform;       /* Constant used for this transform */
} aXformType[] = {
  /* 0 */ { 6, "second",   4.6427e+14,         1.0  },
  /* 1 */ { 6, "minute",   7.7379e+12,        60.0  },
  /* 2 */ { 4, "hour",     1.2897e+11,      3600.0  },
  /* 3 */ { 3, "day",      5373485.0,      86400.0  },
  /* 4 */ { 5, "month",    176546.0,  30.0*86400.0  },
  /* 5 */ { 4, "mnth",     176546.0,  30.0*86400.0  },
  /* 6 */ { 4, "year",     14713.0,  365.0*86400.0  },

  /* 7 */ { 2, "yr",       14713.0,  365.0*86400.0  },
};

/*
** If the DateTime p is raw number, try to figure out if it is
** a julian day number of a unix timestamp.  Set the p value
** appropriately.
*/
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      }

      /* If control reaches this point, it means the transformation is
      ** one of the forms like "+NNN days".  */
      z += n;
      while( sqlite3Isspace(*z) ) z++;
      n = sqlite3Strlen30(z);
      if( n>10 || n<3 ) break;
      if( sqlite3UpperToLower[(u8)z[n-1]]=='s' ) n--;
      computeJD(p);
      assert( rc==1 );
      rRounder = r<0 ? -0.5 : +0.5;
      for(i=0; i<ArraySize(aXformType); i++){
        if( aXformType[i].nName==n
         && sqlite3_strnicmp(aXformType[i].zName, z, n)==0
         && r>-aXformType[i].rLimit && r<aXformType[i].rLimit
        ){
          int targetMonth = 0;
          switch( i ){
            case 6:
            case 4: { /* Special processing to add months */
              assert( strcmp(aXformType[i].zName,"month")==0
                   || strcmp(aXformType[i].zName,"pg-month")==0 );
              computeYMD_HMS(p);
              p->M += (int)r;
              x = p->M>0 ? (p->M-1)/12 : (p->M-12)/12;
              p->Y += x;
              p->M -= x*12;
              assert( p->M>=1 && p->M<=12 );
              if( i==6 ) targetMonth = p->M;
              p->validJD = 0;
              r -= (int)r;
              break;
            }
            case 7:
            case 5: { /* Special processing to add years */
              int y = (int)r;
              assert( strcmp(aXformType[i].zName,"year")==0
                   || strcmp(aXformType[i].zName,"pg-year")==0 );
              computeYMD_HMS(p);
              assert( p->M>=1 && p->M<=12 );
              if( i==7 ) targetMonth = p->M;
              p->Y += y;
              p->validJD = 0;
              r -= (int)r;
              break;








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      }

      /* If control reaches this point, it means the transformation is
      ** one of the forms like "+NNN days".  */
      z += n;
      while( sqlite3Isspace(*z) ) z++;
      n = sqlite3Strlen30(z);
      if( n>10 || n<2 ) break;
      if( sqlite3UpperToLower[(u8)z[n-1]]=='s' ) n--;
      computeJD(p);
      assert( rc==1 );
      rRounder = r<0 ? -0.5 : +0.5;
      for(i=0; i<ArraySize(aXformType); i++){
        if( aXformType[i].nName==n
         && sqlite3_strnicmp(aXformType[i].zName, z, n)==0
         && r>-aXformType[i].rLimit && r<aXformType[i].rLimit
        ){
          int targetMonth = 0;
          switch( i ){
            case 4:
            case 5: { /* Special processing to add months */
              assert( strcmp(aXformType[4].zName,"month")==0 );
              assert( strcmp(aXformType[5].zName,"mnth")==0 );
              computeYMD_HMS(p);
              p->M += (int)r;
              x = p->M>0 ? (p->M-1)/12 : (p->M-12)/12;
              p->Y += x;
              p->M -= x*12;
              assert( p->M>=1 && p->M<=12 );
              if( i==5 ) targetMonth = p->M;
              p->validJD = 0;
              r -= (int)r;
              break;
            }
            case 6:
            case 7: { /* Special processing to add years */
              int y = (int)r;
              assert( strcmp(aXformType[6].zName,"year")==0 );
              assert( strcmp(aXformType[7].zName,"yr")==0 );
              computeYMD_HMS(p);
              assert( p->M>=1 && p->M<=12 );
              if( i==7 ) targetMonth = p->M;
              p->Y += y;
              p->validJD = 0;
              r -= (int)r;
              break;
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Changes to test/date.test.
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datetest 2.47 {datetime('2003-10-22 12:24','8.6 seconds')} {2003-10-22 12:24:08}
datetest 2.48 {datetime('2003-10-22 12:24','9.4 second')} {2003-10-22 12:24:09}
datetest 2.49 {datetime('2003-10-22 12:24','0000 second')} {2003-10-22 12:24:00}
datetest 2.50 {datetime('2003-10-22 12:24','0001 second')} {2003-10-22 12:24:01}
datetest 2.51 {datetime('2003-10-22 12:24','nonsense')} NULL

datetest 2.60 {datetime('2023-02-31')} {2023-03-03 00:00:00}










datetest 3.1 {strftime('%d','2003-10-31 12:34:56.432')} 31
datetest 3.2.1 {strftime('pre%fpost','2003-10-31 12:34:56.432')} pre56.432post
datetest 3.2.2 {strftime('%f','2003-10-31 12:34:59.9999999')} 59.999
datetest 3.3 {strftime('%H','2003-10-31 12:34:56.432')} 12
datetest 3.4 {strftime('%j','2003-10-31 12:34:56.432')} 304
datetest 3.5 {strftime('%J','2003-10-31 12:34:56.432')} 2452944.024264259








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datetest 2.47 {datetime('2003-10-22 12:24','8.6 seconds')} {2003-10-22 12:24:08}
datetest 2.48 {datetime('2003-10-22 12:24','9.4 second')} {2003-10-22 12:24:09}
datetest 2.49 {datetime('2003-10-22 12:24','0000 second')} {2003-10-22 12:24:00}
datetest 2.50 {datetime('2003-10-22 12:24','0001 second')} {2003-10-22 12:24:01}
datetest 2.51 {datetime('2003-10-22 12:24','nonsense')} NULL

datetest 2.60 {datetime('2023-02-31')} {2023-03-03 00:00:00}

datetest 2.70 {date('2024-01-31','+1 month')} {2024-03-02}
datetest 2.71 {date('2024-01-31','+1 mnth')} {2024-02-29}
datetest 2.72 {date('2023-01-31','+1 month')} {2023-03-03}
datetest 2.73 {date('2023-01-31','+1 mnth')} {2023-02-28}
datetest 2.74 {date('2024-02-29','+1 year')} {2025-03-01}
datetest 2.75 {date('2024-02-29','+1 yr')} {2025-02-28}
datetest 2.76 {date('2024-02-29','-110 years')} {1914-03-01}
datetest 2.77 {date('2024-02-29','-110 yrs')} {1914-02-28}

datetest 3.1 {strftime('%d','2003-10-31 12:34:56.432')} 31
datetest 3.2.1 {strftime('pre%fpost','2003-10-31 12:34:56.432')} pre56.432post
datetest 3.2.2 {strftime('%f','2003-10-31 12:34:59.9999999')} 59.999
datetest 3.3 {strftime('%H','2003-10-31 12:34:56.432')} 12
datetest 3.4 {strftime('%j','2003-10-31 12:34:56.432')} 304
datetest 3.5 {strftime('%J','2003-10-31 12:34:56.432')} 2452944.024264259
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