diff --git a/assets/core/utils/DeviceUtil.ts b/assets/core/utils/DeviceUtil.ts
index 823b687..02d4826 100644
--- a/assets/core/utils/DeviceUtil.ts
+++ b/assets/core/utils/DeviceUtil.ts
@@ -40,9 +40,6 @@ export class DeviceUtil {
     /** 是否为字节小游戏 */
     static get isByteDance() { return sys.platform === sys.Platform.BYTEDANCE_MINI_GAME; }
 
-    /** 是否为百度小游戏 */
-    static get isBaidu() { return sys.platform === sys.Platform.BAIDU_MINI_GAME; }
-
     /** 是否为 vivo 小游戏 */
     static get isVivo() { return sys.platform === sys.Platform.VIVO_MINI_GAME; }
 
diff --git a/assets/core/utils/TimeUtils.ts b/assets/core/utils/TimeUtils.ts
index 11a2873..dfd2161 100644
--- a/assets/core/utils/TimeUtils.ts
+++ b/assets/core/utils/TimeUtils.ts
@@ -6,7 +6,7 @@ export class TimeUtil {
      * @param time2 结束时间
      * @returns 
      */
-    public static daysBetween(time1: number | string | Date, time2: number | string | Date): number {
+    static daysBetween(time1: number | string | Date, time2: number | string | Date): number {
         if (time2 == undefined) {
             time2 = +new Date();
         }
@@ -18,7 +18,7 @@ export class TimeUtil {
     }
 
     /** 间隔秒数，时间顺序无要求，最后会获取绝对值 */
-    public static secsBetween(time1: number, time2: number) {
+    static secsBetween(time1: number, time2: number) {
         let dates = Math.abs((time2 - time1)) / (1000);
         dates = Math.floor(dates) + 1;
         return dates;
@@ -28,7 +28,7 @@ export class TimeUtil {
      * 代码休眠时间
      * @param ms 毫秒
      */
-    public static async sleep(ms: number) {
+    static async sleep(ms: number) {
         return new Promise<void>((resolve) => {
             setTimeout(() => {
                 resolve();
diff --git a/assets/libs/extension/DateExt.ts b/assets/libs/extension/DateExt.ts
index 4120fec..46d72a2 100644
--- a/assets/libs/extension/DateExt.ts
+++ b/assets/libs/extension/DateExt.ts
@@ -1,10 +1,14 @@
 declare global {
     interface Date {
+        /** 时间格式化 */
         format(format: string): string;
+        /** 时间加法 */
+        addTime(addMillis: number): Date;
+        /** 验证时间是否在指定范围 */
+        range(t1: number | Date, t2: number | Date): boolean;
     }
 }
 
-/** 格式化时间字符串 */
 Date.prototype.format = function (format: string): string {
     const year: number = this.getFullYear();
     const month: number = this.getMonth() + 1;
@@ -35,4 +39,27 @@ Date.prototype.format = function (format: string): string {
     return r;
 };
 
-export { };
+Date.prototype.addTime = function (addMillis: number) {
+    return new Date(this.getTime() + addMillis);
+}
+
+Date.prototype.range = function (d1: number | Date, d2: number | Date) {
+    let t1: number = -1;
+    let t2: number = -1;
+    if (d1 instanceof Date)
+        t1 = d1.getTime();
+    else
+        t1 = d1;
+    if (d2 instanceof Date)
+        t2 = d2.getTime();
+    else
+        t2 = d2;
+
+    let now = this.getTime();
+    if (now >= t1 && now < t2) {
+        return true;
+    }
+    return false;
+}
+
+export { };
\ No newline at end of file