sqlite3/sqlite3/timezone.patch

# Set UTC timezone, compute local offset.
--- sqlite3.c.orig
+++ sqlite3.c
@@ -340,6 +340,7 @@ static int setDateTimeToCurrent(sqlite3_context *context, DateTime *p){
   p->iJD = sqlite3StmtCurrentTime(context);
   if( p->iJD>0 ){
     p->validJD = 1;
+    p->tzSet = 1;
     return 0;
   }else{
     return 1;
@@ -355,6 +356,7 @@ static int setDateTimeToCurrent(sqlite3_context *context, DateTime *p){
 static void setRawDateNumber(DateTime *p, double r){
   p->s = r;
   p->rawS = 1;
+  p->tzSet = 1;
   if( r>=0.0 && r<5373484.5 ){
     p->iJD = (sqlite3_int64)(r*86400000.0 + 0.5);
     p->validJD = 1;
@@ -731,7 +733,16 @@ static int parseModifier(
       ** show local time.
       */
       if( sqlite3_stricmp(z, "localtime")==0 && sqlite3NotPureFunc(pCtx) ){
-        rc = toLocaltime(p, pCtx);
+        if( p->tzSet!=0 || p->tz==0 ) {
+          rc = toLocaltime(p, pCtx);
+          i64 iOrigJD = p->iJD;
+          p->tzSet = 0;
+          computeJD(p);
+          p->tz = (p->iJD-iOrigJD)/60000;
+          if( abs(p->tz)>= 900 ) p->tz = 0;
+        } else {
+          rc = 0;
+        }
       }
       break;
     }
@@ -781,6 +792,7 @@ static int parseModifier(
           p->validJD = 1;
           p->tzSet = 1;
         }
+        p->tz = 0;
         rc = SQLITE_OK;
       }
 #endif