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New date/time modifier: (+|-)YYYY-MM-DD HH:MM(:SS.SSS)?

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FossilOrigin-Name: 3832b8a9ef84d9b53b48dfce9c1e724897cd7b3e05711e01675419655f894eac
This commit is contained in:
drh
2023-05-29 20:33:33 +00:00
parent 0cbc2143b9
commit 1936a1933c
3 changed files with 43 additions and 12 deletions
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38
src/date.c
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@@ -870,11 +870,46 @@ static int parseModifier(
case '9': {
double rRounder;
int i;
for(n=1; z[n] && z[n]!=':' && !sqlite3Isspace(z[n]); n++){}
int Y,M,D,H,x;
for(n=1; z[n]; n++){
if( z[n]==':' ) break;
if( sqlite3Isspace(z[n]) ) break;
if( z[n]=='-' && n==5 && getDigits(&z[1], "40f", &Y)==1 ) break;
}
if( sqlite3AtoF(z, &r, n, SQLITE_UTF8)<=0 ){
rc = 1;
break;
}
if( z[n]=='-' ){
/* A modifier of the form (+|-)YYYY-MM-DD adds or subtracts the
** specified number of years, months, and days. MM is limited to
** the range 0-11 and DD is limited to 0-30.
*/
if( z[0]!='+' && z[0]!='-' ) break; /* Must start with +/- */
if( n!=5 ) break; /* Must be 4-digit YYYY */
if( getDigits(&z[1], "40f-20a-20d 20c", &Y, &M, &D, &H)!=4 ) break;
if( M>=12 ) break; /* M range 0..11 */
if( D>=31 ) break; /* D range 0..30 */
computeYMD_HMS(p);
p->validJD = 0;
if( z[0]=='-' ){
p->Y -= Y;
p->M -= M;
D = -D;
}else{
p->Y += Y;
p->M += M;
}
x = p->M>0 ? (p->M-1)/12 : (p->M-12)/12;
p->Y += x;
p->M -= x*12;
computeJD(p);
p->validHMS = 0;
p->validYMD = 0;
p->iJD += (i64)D*86400000;
z = &z[12];
n = 2;
}
if( z[n]==':' ){
/* A modifier of the form (+|-)HH:MM:SS.FFF adds (or subtracts) the
** specified number of hours, minutes, seconds, and fractional seconds
@@ -916,7 +951,6 @@ static int parseModifier(
){
switch( i ){
case 4: { /* Special processing to add months */
int x;
assert( strcmp(aXformType[i].zName,"month")==0 );
computeYMD_HMS(p);
p->M += (int)r;