From 2f1e5dc169d7c522716089af9841bec3374bbff8 Mon Sep 17 00:00:00 2001
From: good-jinu <gooday6983@gmail.com>
Date: Thu, 2 Jan 2025 15:01:19 +0900
Subject: [PATCH 1/2] fix: set 'YYYY-MM-DD' as gantt default date format for
 #5862

---
 .../mermaid/src/diagrams/gantt/ganttDb.js     |  4 ++--
 .../src/diagrams/gantt/ganttDb.spec.ts        | 19 ++++++++++++++++++-
 2 files changed, 20 insertions(+), 3 deletions(-)

diff --git a/packages/mermaid/src/diagrams/gantt/ganttDb.js b/packages/mermaid/src/diagrams/gantt/ganttDb.js
index 15c7fab979..187c6cf9ba 100644
--- a/packages/mermaid/src/diagrams/gantt/ganttDb.js
+++ b/packages/mermaid/src/diagrams/gantt/ganttDb.js
@@ -22,7 +22,7 @@ dayjs.extend(dayjsCustomParseFormat);
 dayjs.extend(dayjsAdvancedFormat);
 
 const WEEKEND_START_DAY = { friday: 5, saturday: 6 };
-let dateFormat = '';
+let dateFormat = 'YYYY-MM-DD';
 let axisFormat = '';
 let tickInterval = undefined;
 let todayMarker = '';
@@ -52,7 +52,7 @@ export const clear = function () {
   lastTask = undefined;
   lastTaskID = undefined;
   rawTasks = [];
-  dateFormat = '';
+  dateFormat = 'YYYY-MM-DD';
   axisFormat = '';
   displayMode = '';
   tickInterval = undefined;
diff --git a/packages/mermaid/src/diagrams/gantt/ganttDb.spec.ts b/packages/mermaid/src/diagrams/gantt/ganttDb.spec.ts
index 6f2c8c1afe..22ffe66a72 100644
--- a/packages/mermaid/src/diagrams/gantt/ganttDb.spec.ts
+++ b/packages/mermaid/src/diagrams/gantt/ganttDb.spec.ts
@@ -48,7 +48,7 @@ describe('when using the ganttDb', function () {
       ${'getTasks'}             | ${[]}
       ${'getAccTitle'}          | ${''}
       ${'getAccDescription'}    | ${''}
-      ${'getDateFormat'}        | ${''}
+      ${'getDateFormat'}        | ${'YYYY-MM-DD'}
       ${'getAxisFormat'}        | ${''}
       ${'getTodayMarker'}       | ${''}
       ${'getExcludes'}          | ${[]}
@@ -505,4 +505,21 @@ describe('when using the ganttDb', function () {
     ganttDb.addTask('test1', 'id1,202304,1d');
     expect(() => ganttDb.getTasks()).toThrowError('Invalid date:202304');
   });
+
+  it('should parse date with default format YYYY-MM-DD', function () {
+    ganttDb.addTask('test1', 'id1,2025-01-01,2025-01-14');
+    ganttDb.addTask('test2', 'id2,after id1,2025-01-18');
+
+    const tasks = ganttDb.getTasks();
+
+    expect(tasks[0].startTime).toEqual(new Date(2025, 0, 1));
+    expect(tasks[0].endTime).toEqual(new Date(2025, 0, 14));
+    expect(tasks[0].id).toEqual('id1');
+    expect(tasks[0].task).toEqual('test1');
+
+    expect(tasks[1].startTime).toEqual(new Date(2025, 0, 14));
+    expect(tasks[1].endTime).toEqual(new Date(2025, 0, 18));
+    expect(tasks[1].id).toEqual('id2');
+    expect(tasks[1].task).toEqual('test2');
+  });
 });

From a8dfc66087644a9218ab1d4967adab869ee36068 Mon Sep 17 00:00:00 2001
From: good-jinu <gooday6983@gmail.com>
Date: Fri, 3 Jan 2025 21:52:38 +0900
Subject: [PATCH 2/2] Run pnpm changeset

---
 .changeset/perfect-jars-provide.md | 5 +++++
 1 file changed, 5 insertions(+)
 create mode 100644 .changeset/perfect-jars-provide.md

diff --git a/.changeset/perfect-jars-provide.md b/.changeset/perfect-jars-provide.md
new file mode 100644
index 0000000000..33740f088e
--- /dev/null
+++ b/.changeset/perfect-jars-provide.md
@@ -0,0 +1,5 @@
+---
+'mermaid': patch
+---
+
+fix: Set 'YYYY-MM-DD' as gantt default date format