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Allow time modifiers of the form HH:MM:SS.SSS with an option "+" or "-"

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prefix.  The specified amount of time is added into the date-time begin
modified. (CVS 1277)

FossilOrigin-Name: 559002a52fe3c42fe71ffce364eff4a036ae6b83
This commit is contained in:
drh
2004-02-29 00:40:32 +00:00
parent 3039c0a896
commit 33a9ad2f8c
3 changed files with 44 additions and 19 deletions
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49
src/date.c
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@@ -16,7 +16,7 @@
** sqliteRegisterDateTimeFunctions() found at the bottom of the file.
** All other code has file scope.
**
** $Id: date.c,v 1.12 2004/02/22 17:49:33 drh Exp $
** $Id: date.c,v 1.13 2004/02/29 00:40:32 drh Exp $
**
** NOTES:
**
@@ -335,17 +335,23 @@ static int parseDateOrTime(const char *zDate, DateTime *p){
static void computeYMD(DateTime *p){
int Z, A, B, C, D, E, X1;
if( p->validYMD ) return;
Z = p->rJD + 0.5;
A = (Z - 1867216.25)/36524.25;
A = Z + 1 + A - (A/4);
B = A + 1524;
C = (B - 122.1)/365.25;
D = 365.25*C;
E = (B-D)/30.6001;
X1 = 30.6001*E;
p->D = B - D - X1;
p->M = E<14 ? E-1 : E-13;
p->Y = p->M>2 ? C - 4716 : C - 4715;
if( !p->validJD ){
p->Y = 2000;
p->M = 1;
p->D = 1;
}else{
Z = p->rJD + 0.5;
A = (Z - 1867216.25)/36524.25;
A = Z + 1 + A - (A/4);
B = A + 1524;
C = (B - 122.1)/365.25;
D = 365.25*C;
E = (B-D)/30.6001;
X1 = 30.6001*E;
p->D = B - D - X1;
p->M = E<14 ? E-1 : E-13;
p->Y = p->M>2 ? C - 4716 : C - 4715;
}
p->validYMD = 1;
}
@@ -560,6 +566,25 @@ static int parseModifier(const char *zMod, DateTime *p){
case '9': {
n = getValue(z, &r);
if( n<=0 ) break;
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
** to the time. The ".FFF" may be omitted. The ":SS.FFF" may be
** omitted.
*/
const char *z2 = z;
DateTime tx;
int day;
if( !isdigit(*z2) ) z2++;
memset(&tx, 0, sizeof(tx));
if( parseHhMmSs(z2, &tx) ) break;
computeJD(&tx);
if( z[0]=='-' ) tx.rJD = -tx.rJD;
day = (int)tx.rJD;
p->rJD += tx.rJD - day;
rc = 0;
break;
}
z += n;
while( isspace(z[0]) ) z++;
n = strlen(z);