diff --git a/drivers/rtc/rtc-lib.c b/drivers/rtc/rtc-lib.c
index c4cf057..e6bfb9c 100644
--- a/drivers/rtc/rtc-lib.c
+++ b/drivers/rtc/rtc-lib.c
@@ -45,16 +45,20 @@
 }
 EXPORT_SYMBOL(rtc_year_days);
 
+
 /*
+ * rtc_time_to_tm64 - Converts time64_t to rtc_time.
  * Convert seconds since 01-01-1970 00:00:00 to Gregorian date.
  */
-void rtc_time_to_tm(unsigned long time, struct rtc_time *tm)
+void rtc_time64_to_tm(time64_t time, struct rtc_time *tm)
 {
 	unsigned int month, year;
+	unsigned long secs;
 	int days;
 
-	days = time / 86400;
-	time -= (unsigned int) days * 86400;
+	/* time must be positive */
+	days = div_s64(time, 86400);
+	secs = time - (unsigned int) days * 86400;
 
 	/* day of the week, 1970-01-01 was a Thursday */
 	tm->tm_wday = (days + 4) % 7;
@@ -81,14 +85,14 @@
 	tm->tm_mon = month;
 	tm->tm_mday = days + 1;
 
-	tm->tm_hour = time / 3600;
-	time -= tm->tm_hour * 3600;
-	tm->tm_min = time / 60;
-	tm->tm_sec = time - tm->tm_min * 60;
+	tm->tm_hour = secs / 3600;
+	secs -= tm->tm_hour * 3600;
+	tm->tm_min = secs / 60;
+	tm->tm_sec = secs - tm->tm_min * 60;
 
 	tm->tm_isdst = 0;
 }
-EXPORT_SYMBOL(rtc_time_to_tm);
+EXPORT_SYMBOL(rtc_time64_to_tm);
 
 /*
  * Does the rtc_time represent a valid date/time?
@@ -109,24 +113,22 @@
 EXPORT_SYMBOL(rtc_valid_tm);
 
 /*
+ * rtc_tm_to_time64 - Converts rtc_time to time64_t.
  * Convert Gregorian date to seconds since 01-01-1970 00:00:00.
  */
-int rtc_tm_to_time(struct rtc_time *tm, unsigned long *time)
+time64_t rtc_tm_to_time64(struct rtc_time *tm)
 {
-	*time = mktime(tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
+	return mktime64(tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
 			tm->tm_hour, tm->tm_min, tm->tm_sec);
-	return 0;
 }
-EXPORT_SYMBOL(rtc_tm_to_time);
+EXPORT_SYMBOL(rtc_tm_to_time64);
 
 /*
  * Convert rtc_time to ktime
  */
 ktime_t rtc_tm_to_ktime(struct rtc_time tm)
 {
-	time_t time;
-	rtc_tm_to_time(&tm, &time);
-	return ktime_set(time, 0);
+	return ktime_set(rtc_tm_to_time64(&tm), 0);
 }
 EXPORT_SYMBOL_GPL(rtc_tm_to_ktime);
 
@@ -135,14 +137,14 @@
  */
 struct rtc_time rtc_ktime_to_tm(ktime_t kt)
 {
-	struct timespec ts;
+	struct timespec64 ts;
 	struct rtc_time ret;
 
-	ts = ktime_to_timespec(kt);
+	ts = ktime_to_timespec64(kt);
 	/* Round up any ns */
 	if (ts.tv_nsec)
 		ts.tv_sec++;
-	rtc_time_to_tm(ts.tv_sec, &ret);
+	rtc_time64_to_tm(ts.tv_sec, &ret);
 	return ret;
 }
 EXPORT_SYMBOL_GPL(rtc_ktime_to_tm);