diff --git a/app/src/main/java/com/bonus/canteen/utils/DateTimeHelper.java b/app/src/main/java/com/bonus/canteen/utils/DateTimeHelper.java
index e035804..c08f069 100644
--- a/app/src/main/java/com/bonus/canteen/utils/DateTimeHelper.java
+++ b/app/src/main/java/com/bonus/canteen/utils/DateTimeHelper.java
@@ -37,11 +37,11 @@ public class DateTimeHelper {
     }
 
     public static String getTime() {
-        return format(new Date(), "YYYY-MM-dd HH:mm:ss");
+        return format(new Date(), "yyyy-MM-dd HH:mm:ss");
     }
 
     public static String getNowDate() {
-        return format(new Date(), "YYYY-MM-dd");
+        return format(new Date(), "yyyy-MM-dd");
     }
 
     public static String getCurrentTimeStr() {
@@ -94,12 +94,12 @@ public class DateTimeHelper {
 
     public static int getIntervalDuration(String startTime, String endTime) {
         int time = 0;
-        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("YYYY-MM-dd HH:mm:ss");
+        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
         try {
             Date date1 = simpleDateFormat.parse(startTime);
             Date date2 = simpleDateFormat.parse(endTime);
 
-            SimpleDateFormat df = new SimpleDateFormat("YYYY-MM-dd HH:mm:ss");
+            SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
             long currentTime = System.currentTimeMillis();
             //从对象中拿到时间
             long d1 = df.parse(df.format(date1)).getTime();