mirror of https://github.com/sqlite/sqlite
Add localtime<-->UTC conversions to the date functions. (CVS 1146)
FossilOrigin-Name: 8482b8c44766e7f80fc449b3dbdd3f37396c332b
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@ -1,5 +1,5 @@
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C Test\sfunctions\stolerate\san\s"0x"\sbefore\sa\spointer\svalue.\s\sTicket\s#452.\s(CVS\s1145)
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D 2003-12-23T03:06:23
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C Add\slocaltime<-->UTC\sconversions\sto\sthe\sdate\sfunctions.\s(CVS\s1146)
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D 2003-12-23T16:22:18
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F Makefile.in 0515ff9218ad8d5a8f6220f0494b8ef94c67013b
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F Makefile.linux-gcc b86a99c493a5bfb402d1d9178dcdc4bd4b32f906
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F README f1de682fbbd94899d50aca13d387d1b3fd3be2dd
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@ -28,7 +28,7 @@ F src/btree.h 9b7c09f1e64274d7bb74a57bbfc63778f67b1048
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F src/btree_rb.c e4084b6a12270674b0cd7034655f55e6a2639c78
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F src/build.c a7493c433de5b552f9535d8fa7ed80aaf135491e
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F src/copy.c 9e47975ea96751c658bcf1a0c4f0bb7c6ee61e73
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F src/date.c ec36ce6f044fbc6c837c5bc52e71cdba0ea2746e
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F src/date.c 1e3318d8450088f235442ca1cddd2601c0c32d1a
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F src/delete.c 0f81e6799c089487615d38e042a2de4d2d6192bc
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F src/encode.c 25ea901a9cefb3d93774afa4a06b57cb58acf544
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F src/expr.c a14401a54e5923f3e52b6d04a83813d150f43f33
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@ -84,7 +84,7 @@ F test/btree4rb.test ae6f0438512edcb45cf483471cd6070a765963a9
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F test/capi2.test ec96e0e235d87b53cbaef3d8e3e0f8ccf32c71ca
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F test/conflict.test 0911bb2f079046914a6e9c3341b36658c4e2103e
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F test/copy.test 88dabd4e811b17644b726aa81d404e73b7635c84
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F test/date.test 17619ff81d5b813092915927c50923e265e85bd8
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F test/date.test 510cf3dbc0bc090fc28b2ae1bc290dcd920f5414
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F test/delete.test 92256384f1801760180ded129f7427884cf28886
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F test/expr.test c4cc292d601019c2f2ce95093caaa5d10284b105
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F test/fkey1.test d65c824459916249bee501532d6154ddab0b5db7
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@ -179,7 +179,7 @@ F www/speed.tcl 2f6b1155b99d39adb185f900456d1d592c4832b3
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F www/sqlite.tcl 3c83b08cf9f18aa2d69453ff441a36c40e431604
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F www/tclsqlite.tcl b9271d44dcf147a93c98f8ecf28c927307abd6da
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F www/vdbe.tcl 9b9095d4495f37697fd1935d10e14c6015e80aa1
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P 4d9edbc50f7dee64edbadad2e2dc4f93d8248b3b
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R e78cc5676ccc4eae1ef13e1cbefdf7e8
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P c6c5e07b65ae1c30117f0276a1002d5036697cf1
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R bb5987106040b561c6e78128774239d9
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U drh
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Z 2c02f4b435e2dadedef60f34ed1da32e
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Z cdbbb6875dbb4ed10b1b0f72076527c5
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@ -1 +1 @@
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c6c5e07b65ae1c30117f0276a1002d5036697cf1
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8482b8c44766e7f80fc449b3dbdd3f37396c332b
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80
src/date.c
80
src/date.c
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** sqliteRegisterDateTimeFunctions() found at the bottom of the file.
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** All other code has file scope.
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**
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** $Id: date.c,v 1.2 2003/12/23 02:17:35 drh Exp $
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** $Id: date.c,v 1.3 2003/12/23 16:22:18 drh Exp $
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**
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** NOTES:
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**
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@ -51,6 +51,7 @@
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#include <ctype.h>
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#include <stdlib.h>
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#include <assert.h>
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#include <time.h>
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#include "sqliteInt.h"
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#include "os.h"
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@ -367,6 +368,52 @@ static void computeHMS(DateTime *p){
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p->validHMS = 1;
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}
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/*
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** Compute the difference (in days) between localtime and UTC (a.k.a. GMT)
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** for the time value p where p is in UTC.
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*/
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static double localtimeOffset(DateTime *p){
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DateTime x, y;
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time_t t;
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struct tm *pTm;
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computeYMD(p);
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computeHMS(p);
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x = *p;
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if( x.Y<1971 || x.Y>=2038 ){
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x.Y = 2000;
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x.M = 1;
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x.D = 1;
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x.h = 0;
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x.m = 0;
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x.s = 0.0;
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} else {
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int s = x.s + 0.5;
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x.s = s;
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}
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x.tz = 0;
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x.validJD = 0;
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computeJD(&x);
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t = (x.rJD-2440587.5)*86400.0 + 0.5;
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sqliteOsEnterMutex();
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pTm = localtime(&t);
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y.Y = pTm->tm_year + 1900;
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y.M = pTm->tm_mon + 1;
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y.D = pTm->tm_mday;
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y.h = pTm->tm_hour;
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y.m = pTm->tm_min;
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y.s = pTm->tm_sec;
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sqliteOsLeaveMutex();
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y.validYMD = 1;
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y.validHMS = 1;
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y.validJD = 0;
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y.validTZ = 0;
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computeJD(&y);
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/* printf("x=%d-%02d-%02d %02d:%02d:%02d\n",x.Y,x.M,x.D,x.h,x.m,(int)x.s); */
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/* printf("y=%d-%02d-%02d %02d:%02d:%02d\n",y.Y,y.M,y.D,y.h,y.m,(int)y.s); */
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/* printf("diff=%.17g\n", y.rJD - x.rJD); */
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return y.rJD - x.rJD;
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}
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/*
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** Process a modifier to a date-time stamp. The modifiers are
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** as follows:
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@ -383,6 +430,8 @@ static void computeHMS(DateTime *p){
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** start of day
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** weekday N
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** unixepoch
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** localtime
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** utc
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**
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** Return 0 on success and 1 if there is any kind of error.
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*/
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@ -396,6 +445,22 @@ static int parseModifier(const char *zMod, DateTime *p){
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}
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z[n] = 0;
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switch( z[0] ){
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case 'l': {
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/* localtime
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**
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** Assuming the current time value is UTC (a.k.a. GMT), shift it to
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** show local time.
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*/
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if( strcmp(z, "localtime")==0 ){
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computeJD(p);
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p->rJD += localtimeOffset(p);
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p->validYMD = 0;
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p->validHMS = 0;
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p->validTZ = 0;
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rc = 0;
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}
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break;
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}
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case 'u': {
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/*
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** unixepoch
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p->validHMS = 0;
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p->validTZ = 0;
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rc = 0;
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}else if( strcmp(z, "utc")==0 ){
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double c1;
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computeJD(p);
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c1 = localtimeOffset(p);
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p->rJD -= c1;
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p->validYMD = 0;
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p->validHMS = 0;
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p->validTZ = 0;
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p->rJD += c1 - localtimeOffset(p);
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p->validYMD = 0;
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p->validHMS = 0;
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p->validTZ = 0;
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rc = 0;
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}
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break;
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}
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# This file implements regression tests for SQLite library. The
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# focus of this file is testing date and time functions.
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#
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# $Id: date.test,v 1.1 2003/11/01 01:53:54 drh Exp $
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# $Id: date.test,v 1.2 2003/12/23 16:22:18 drh Exp $
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set testdir [file dirname $argv0]
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source $testdir/tester.tcl
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@ -120,4 +120,36 @@ datetest 5.2 {datetime('1994-04-16 14:00:00 +05:15')} {1994-04-16 19:15:00}
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datetest 5.3 {datetime('1994-04-16 05:00:00 -08:30')} {1994-04-15 20:30:00}
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datetest 5.4 {datetime('1994-04-16 14:00:00 +11:55')} {1994-04-17 01:55:00}
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# localtime->utc and utc->localtime conversions. These tests only work
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# if the localtime is in the US Eastern Time (the time in Charlotte, NC
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# and in New York.)
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#
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if {[clock format 0 -format %Z]=="EST"} {
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datetest 6.1 {datetime('2000-10-29 05:59:00','localtime')}\
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{2000-10-29 01:59:00}
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datetest 6.2 {datetime('2000-10-29 06:00:00','localtime')}\
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{2000-10-29 01:00:00}
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datetest 6.3 {datetime('2000-04-02 06:59:00','localtime')}\
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{2000-04-02 01:59:00}
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datetest 6.4 {datetime('2000-04-02 07:00:00','localtime')}\
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{2000-04-02 03:00:00}
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datetest 6.5 {datetime('2000-10-29 01:59:00','utc')} {2000-10-29 05:59:00}
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datetest 6.6 {datetime('2000-10-29 02:00:00','utc')} {2000-10-29 07:00:00}
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datetest 6.7 {datetime('2000-04-02 01:59:00','utc')} {2000-04-02 06:59:00}
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datetest 6.8 {datetime('2000-04-02 02:00:00','utc')} {2000-04-02 06:00:00}
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datetest 6.10 {datetime('2000-01-01 12:00:00','localtime')} \
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{2000-01-01 07:00:00}
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datetest 6.11 {datetime('1969-01-01 12:00:00','localtime')} \
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{1969-01-01 07:00:00}
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datetest 6.12 {datetime('2039-01-01 12:00:00','localtime')} \
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{2039-01-01 07:00:00}
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datetest 6.13 {datetime('2000-07-01 12:00:00','localtime')} \
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{2000-07-01 08:00:00}
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datetest 6.14 {datetime('1969-07-01 12:00:00','localtime')} \
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{1969-07-01 07:00:00}
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datetest 6.15 {datetime('2039-07-01 12:00:00','localtime')} \
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{2039-07-01 07:00:00}
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}
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finish_test
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