diff --git a/lib/ui/date.js b/lib/ui/date.js
index f8c5bf1..33506d8 100644
--- a/lib/ui/date.js
+++ b/lib/ui/date.js
@@ -32,16 +32,16 @@ export function createDateInput(min, max, element) {
 /**
  * 将日期转换为 `yyyy-MM-dd` 格式的字符串
  * @param {Date} dt 要转换的日期值
- * @param {boolean} [utc] 是否采用 UTC 值
+ * @param {boolean} [local] 是否视日期为本地时间
  * @returns 返回 `yyyy-MM-dd` 格式的字符串
  */
-export function toDateValue(dt, utc) {
+export function toDateValue(dt, local) {
     if (isNaN(dt)) {
         return '';
     }
-    const year = utc ? dt.getUTCFullYear() : dt.getFullYear();
-    const month = String((utc ? dt.getUTCMonth() : dt.getMonth()) + 1).padStart(2, '0');
-    const date = String(utc ? dt.getUTCDate() : dt.getDate()).padStart(2, '0');
+    const year = local ? dt.getFullYear() : dt.getUTCFullYear();
+    const month = String((local ? dt.getMonth() : dt.getUTCMonth()) + 1).padStart(2, '0');
+    const date = String(local ? dt.getDate() : dt.getUTCDate()).padStart(2, '0');
     return `${year}-${month}-${date}`;
 }
 
@@ -80,16 +80,28 @@ export function setDateValue(element, val) {
         } else if (isNaN(val)) {
             if (/^\d{4}-\d{2}-\d{2}/.test(val)) {
                 element.value = String(val).substring(0, 10);
-            } else if (/^\d{1,2}\/\d{1,2}\/\d{4}$/.test(val)) {
-                element.value = toDateValue(new Date(val));
             } else {
-                element.value = '';
+                const e = /^(\d{1,2})\/(\d{1,2})\/(\d{4})$/.exec(val);
+                if (e != null) {
+                    const month = e[1].padStart(2, '0');
+                    const day = e[2].padStart(2, '0');
+                    const year = e[3];
+                    element.value = `${year}-${month}-${day}`;
+                } else {
+                    element.value = '';
+                }
             }
         } else {
-            if (!(val instanceof Date)) {
-                val = new Date((val - 621355968e9) / 1e4);
+            if (val instanceof Date) {
+                element.value = toDateValue(val);
+            } else {
+                const ticks = Number(val);
+                if (!isNaN(ticks) && ticks > 0) {
+                    element.value = toDateValue(new Date((ticks - 621355968e9) / 1e4));
+                } else {
+                    element.value = '';
+                }
             }
-            element.value = toDateValue(val, true);
         }
     } else {
         element.innerText = formatDate(val);
@@ -117,7 +129,10 @@ export function getDateValue(element, formatter) {
             return '';
         }
         if (typeof formatter === 'function') {
-            return formatter(date);
+            const month = String(date.getUTCMonth() + 1).padStart(2, '0');
+            const day = String(date.getUTCDate()).padStart(2, '0');
+            // 使外部 formatter 不需要再处理 `getUTCDate` 亦或是 `getDate`
+            return formatter(new Date(`${year}-${month}-${day}T00:00:00`));
         }
         return String(date.getTime() * 1e4 + 621355968e9);
     }