diff --git a/openrtx/include/interfaces/rtc.h b/openrtx/include/interfaces/rtc.h
index 25f54db3..f4be96e1 100644
--- a/openrtx/include/interfaces/rtc.h
+++ b/openrtx/include/interfaces/rtc.h
@@ -36,10 +36,10 @@ typedef struct
     uint8_t minute : 6;    /* Minutes (0-59)          */
     uint8_t second : 6;    /* Seconds (0-59)          */
     uint8_t day    : 3;    /* Day of the week (1-7)   */
-    uint8_t date   : 4;    /* Day of the month (1-31) */
+    uint8_t date   : 5;    /* Day of the month (1-31) */
     uint8_t month  : 4;    /* Month (1-12)            */
     uint8_t year   : 7;    /* Year (0-99)             */
-    uint8_t        : 5;    /* Padding to 40 bits      */
+    uint8_t        : 4;    /* Padding to 40 bits      */
 }curTime_t;
 
 /**