1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/rtc/rtc-pcf50633.c b/drivers/rtc/rtc-pcf50633.c
index f4dd87e29075..77b40ddd66e6 100644
--- a/drivers/rtc/rtc-pcf50633.c
+++ b/drivers/rtc/rtc-pcf50633.c
@@ -70,7 +70,7 @@ static void pcf2rtc_time(struct rtc_time *rtc, struct pcf50633_time *pcf)
         rtc->tm_hour = bcd2bin(pcf->time[PCF50633_TI_HOUR]);
         rtc->tm_wday = bcd2bin(pcf->time[PCF50633_TI_WKDAY]);
         rtc->tm_mday = bcd2bin(pcf->time[PCF50633_TI_DAY]);
-        rtc->tm_mon = bcd2bin(pcf->time[PCF50633_TI_MONTH]);
+        rtc->tm_mon = bcd2bin(pcf->time[PCF50633_TI_MONTH]) - 1;
         rtc->tm_year = bcd2bin(pcf->time[PCF50633_TI_YEAR]) + 100;
 }
 
@@ -81,7 +81,7 @@ static void rtc2pcf_time(struct pcf50633_time *pcf, struct rtc_time *rtc)
         pcf->time[PCF50633_TI_HOUR] = bin2bcd(rtc->tm_hour);
         pcf->time[PCF50633_TI_WKDAY] = bin2bcd(rtc->tm_wday);
         pcf->time[PCF50633_TI_DAY] = bin2bcd(rtc->tm_mday);
-        pcf->time[PCF50633_TI_MONTH] = bin2bcd(rtc->tm_mon);
+        pcf->time[PCF50633_TI_MONTH] = bin2bcd(rtc->tm_mon + 1);
         pcf->time[PCF50633_TI_YEAR] = bin2bcd(rtc->tm_year % 100);
 }