diff --git a/runtime/js_date.h b/runtime/js_date.h
index 86f4695e295fae9502ce7e648251989e8aa8e3a9..ab2411a92a442decf9b5fcc13f4cf73113a61335 100644
--- a/runtime/js_date.h
+++ b/runtime/js_date.h
@@ -23,7 +23,7 @@
 
 namespace panda::ecmascript {
 static constexpr int64_t DAYS_IN_YEAR = 365;
-static constexpr std::array<int, 2> APPROXIMATION_NUMBER = {100000, 3652425};
+static constexpr std::array<int, 2> APPROXIMATION_NUMBER = {10000, 3652425};
 static constexpr int64_t CHINA_BEFORE_1900_MS = -2177481943000;
 static constexpr int64_t CHINA_1901_MS = -2177452800000;
 static constexpr int CHINA_BEFORE_1901_ADDMS = 343000;