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

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

FossilOrigin-Name: 559002a52fe3c42fe71ffce364eff4a036ae6b83

manifest

@@ -1,5 +1,5 @@
-C Fix\ssome\scompiler\swarnings\sin\sLCC.\s\sThe\swarnings\sdid\snot\sindicate\sreal\nproblems.\s\sTicket\s#634.\s\sNot\sall\swarnings\sin\sticket\s#634\swere\sfixed.\s(CVS\s1276)
-D 2004-02-29T00:11:31
+C Allow\stime\smodifiers\sof\sthe\sform\sHH:MM:SS.SSS\swith\san\soption\s"+"\sor\s"-"\nprefix.\s\sThe\sspecified\samount\sof\stime\sis\sadded\sinto\sthe\sdate-time\sbegin\nmodified.\s(CVS\s1277)
+D 2004-02-29T00:40:32
 F Makefile.in afc6c0377773421633e592347097ad036eef6aeb
 F Makefile.linux-gcc b86a99c493a5bfb402d1d9178dcdc4bd4b32f906
 F README f1de682fbbd94899d50aca13d387d1b3fd3be2dd
@@ -28,7 +28,7 @@ F src/btree.h 41cb3ff6ebc3f6da2d0a074e39ff8c7a2287469f
 F src/btree_rb.c 99feb3ff835106d018a483a1ce403e5cf9c718bc
 F src/build.c c8ab8b467d9a64254b0d4d42083f6313b3a980d1
 F src/copy.c 750e13828c3e4a293123e36aaa7cf0f22466248a
-F src/date.c 3025642cee50d5c41aef4a22cbc41aa7e543c922
+F src/date.c 6cb69543021dfeef085c0b49086906b4e3d9dac4
 F src/delete.c 82001c74882319f94dab5f6b92a27311b31092ae
 F src/encode.c 9e70ea1e4e746f23f18180949e94f1bb1c2220d3
 F src/expr.c 95ea5d47d11b5085aaeeb77d60b17c2cba13383a
@@ -188,7 +188,7 @@ F www/sqlite.tcl 3c83b08cf9f18aa2d69453ff441a36c40e431604
 F www/tclsqlite.tcl b9271d44dcf147a93c98f8ecf28c927307abd6da
 F www/vdbe.tcl 9b9095d4495f37697fd1935d10e14c6015e80aa1
 F www/whentouse.tcl a8335bce47cc2fddb07f19052cb0cb4d9129a8e4
-P cce5bbf49b0a30c40d24a559bc6cb4585dd9aea5
-R c1ab69a50c059587ef6df03a47d3a546
+P e97089b7df3e2fbfcf36062099d02ecb75e9a870
+R e43012c1435f7b87cb5af95eb1f1d59c
 U drh
-Z 589d89131597903f1402420d403727ec
+Z 25e5e801d04060bff00304ad2d736bd0

manifest.uuid

@@ -1 +1 @@
-e97089b7df3e2fbfcf36062099d02ecb75e9a870
+559002a52fe3c42fe71ffce364eff4a036ae6b83

src/date.c

@@ -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);