diff --git a/YD_AllHeartRates.Api/Services/Impl/HeartRateReportService.cs b/YD_AllHeartRates.Api/Services/Impl/HeartRateReportService.cs
index 33c393a..b277a88 100644
--- a/YD_AllHeartRates.Api/Services/Impl/HeartRateReportService.cs
+++ b/YD_AllHeartRates.Api/Services/Impl/HeartRateReportService.cs
@@ -68,7 +68,7 @@ namespace YD_AllHeartRates.Api.Services.Impl
             res.FemaleCount = studentList.Count(x => x.Sex == 2);
 
             // 先尝试从缓存读取
-            var cacheKey = $"HeartRateData_{schoolCode}_{scoreTime}";
+            var cacheKey = $"HeartRateData_{schoolCode}_{scoreTime:yyyyMMdd}";
             var data = _caching.Get<List<HeartRateData>>(cacheKey);
 
             if (data == null || data.Count == 0)
@@ -154,7 +154,7 @@ namespace YD_AllHeartRates.Api.Services.Impl
 
             // 先尝试从缓存读取
 
-            var cacheKey = $"HeartRateData_{schoolCode}_{scoreTime}";
+            var cacheKey = $"HeartRateData_{schoolCode}_{scoreTime:yyyyMMdd}";
             var allData = _caching.Get<List<HeartRateData>>(cacheKey);
 
             if (allData == null || allData.Count == 0)
@@ -236,7 +236,7 @@ namespace YD_AllHeartRates.Api.Services.Impl
 
 
             // 先尝试从缓存读取
-            var cacheKey = $"HeartRateData_{schoolCode}_{scoreTime}";
+            var cacheKey = $"HeartRateData_{schoolCode}_{scoreTime:yyyyMMdd}";
             var allData = _caching.Get<List<HeartRateData>>(cacheKey);
 
             if (allData == null || allData.Count == 0)
@@ -292,7 +292,7 @@ namespace YD_AllHeartRates.Api.Services.Impl
             var (dayStart, dayEnd, _) = HeartRateReportHelper.GetTimeRange(scoreTime);
 
             // 先尝试从缓存读取
-            var cacheKey = $"HeartRateData_{schoolCode}_{scoreTime}";
+            var cacheKey = $"HeartRateData_{schoolCode}_{scoreTime:yyyyMMdd}";
             var allData = _caching.Get<List<HeartRateData>>(cacheKey);
 
             if (allData == null || allData.Count == 0)