From 16f02a72b8191d1659b8d6bb672a923963c11773 Mon Sep 17 00:00:00 2001
From: Zhuyuyangyy <193758752+Zhuyuyangyy@users.noreply.github.com>
Date: Sat, 31 Oct 2026 17:37:09 +0800
Subject: [PATCH 1/2] fix: parse negative ten-digit timestamps as seconds

---
 src/date.ts       |  2 +-
 test/date.test.ts | 15 +++++++++++++++
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/src/date.ts b/src/date.ts
index f3dae43..1edbcdb 100644
--- a/src/date.ts
+++ b/src/date.ts
@@ -166,7 +166,7 @@ export function timestamp(t?: number | string): number | Date {
     // Convert timestamp to Date
     // Timestamp(timestampValue)
     let v = typeof t === 'string' ? Number(t) : t;
-    if (String(v).length === 10) {
+    if (String(v).length === 10 || (v < 0 && String(-v).length === 10)) {
       v *= 1000;
     }
     return new Date(v);
diff --git a/test/date.test.ts b/test/date.test.ts
index c6f348b..bd69c23 100644
--- a/test/date.test.ts
+++ b/test/date.test.ts
@@ -250,6 +250,21 @@ describe('test/date.test.ts', () => {
       assert.equal((utility.timestamp('1385091596') as Date).getTime(), 1385091596000);
       assert.equal((utility.timestamp('1385091596000') as Date).getTime(), 1385091596000);
     });
+
+    it('should parse negative seconds while preserving existing unit inference', () => {
+      const cases: Array<[number | string, number]> = [
+        [ -1385091596, -1385091596000 ],
+        [ '-1385091596', -1385091596000 ],
+        [ 1385091596000, 1385091596000 ],
+        [ -1385091596000, -1385091596000 ],
+        [ 1385091596, 1385091596000 ],
+        [ -138509159, -138509159000 ],
+        [ '-138509159', -138509159000 ],
+      ];
+      for (const [ input, expected ] of cases) {
+        assert.equal((utility.timestamp(input) as Date).getTime(), expected, String(input));
+      }
+    });
   });
 
   describe('dateToUnixTimestamp()', () => {

From c4cc710bc03a2461663c0b661a145b65b22482a7 Mon Sep 17 00:00:00 2001
From: Zhuyuyangyy <193758752+Zhuyuyangyy@users.noreply.github.com>
Date: Sat, 31 Oct 2026 17:44:17 +0800
Subject: [PATCH 2/2] fix: preserve fractional timestamp input behavior

---
 src/date.ts       | 2 +-
 test/date.test.ts | 4 ++++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/date.ts b/src/date.ts
index 1edbcdb..74cd73c 100644
--- a/src/date.ts
+++ b/src/date.ts
@@ -166,7 +166,7 @@ export function timestamp(t?: number | string): number | Date {
     // Convert timestamp to Date
     // Timestamp(timestampValue)
     let v = typeof t === 'string' ? Number(t) : t;
-    if (String(v).length === 10 || (v < 0 && String(-v).length === 10)) {
+    if (String(v).length === 10 || (v < 0 && Number.isInteger(v) && String(-v).length === 10)) {
       v *= 1000;
     }
     return new Date(v);
diff --git a/test/date.test.ts b/test/date.test.ts
index bd69c23..cebd5be 100644
--- a/test/date.test.ts
+++ b/test/date.test.ts
@@ -260,6 +260,10 @@ describe('test/date.test.ts', () => {
         [ 1385091596, 1385091596000 ],
         [ -138509159, -138509159000 ],
         [ '-138509159', -138509159000 ],
+        [ -12345.6789, -12345 ],
+        [ '-12345.6789', -12345 ],
+        [ 12345.6789, 12345678 ],
+        [ '12345.6789', 12345678 ],
       ];
       for (const [ input, expected ] of cases) {
         assert.equal((utility.timestamp(input) as Date).getTime(), expected, String(input));