diff --git a/base/common/DateLUTImpl.cpp b/base/common/DateLUTImpl.cpp
index 9668b73fb05..679f988fe7e 100644
--- a/base/common/DateLUTImpl.cpp
+++ b/base/common/DateLUTImpl.cpp
@@ -75,6 +75,11 @@ DateLUTImpl::DateLUTImpl(const std::string & time_zone_)
         values.day_of_week = getDayOfWeek(date);
         values.date = start_of_day;
 
+        assert(values.year >= DATE_LUT_MIN_YEAR && values.year <= DATE_LUT_MAX_YEAR);
+        assert(values.month >= 1 && values.month <= 12);
+        assert(values.day_of_month >= 1 && values.day_of_month <= 31);
+        assert(values.day_of_week >= 1 && values.day_of_week <= 7);
+
         if (values.day_of_month == 1)
         {
             cctz::civil_month month(date);