1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/rtc/interface.c b/drivers/rtc/interface.c
index 8e286259a007..8a1c031391d6 100644
--- a/drivers/rtc/interface.c
+++ b/drivers/rtc/interface.c
@@ -228,11 +228,11 @@ int __rtc_read_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm)
                 alarm->time.tm_hour = now.tm_hour;
 
         /* For simplicity, only support date rollover for now */
-        if (alarm->time.tm_mday == -1) {
+        if (alarm->time.tm_mday < 1 || alarm->time.tm_mday > 31) {
                 alarm->time.tm_mday = now.tm_mday;
                 missing = day;
         }
-        if (alarm->time.tm_mon == -1) {
+        if ((unsigned)alarm->time.tm_mon >= 12) {
                 alarm->time.tm_mon = now.tm_mon;
                 if (missing == none)
                         missing = month;