diff --git a/src/ui.c b/src/ui.c
index dcd0745..9ee8959 100644
--- a/src/ui.c
+++ b/src/ui.c
@@ -19,6 +19,9 @@
 #define localtime_r(T, Tm) (localtime_s(Tm, T) ? NULL : Tm)
 #endif
 
+#define minutes(n) (60 * n)
+#define hours(n) (60 * minutes(n))
+#define days(n) (24 * hours(n))
 const char *dbName = "db.csv";
 
 int main(void) {
@@ -83,8 +86,7 @@ int main(void) {
       // }
 
       // create deadline timestamp
-      lc.tm_hour += (taskdeadline_date * 24);
-      time_t deadline = mktime(&lc);
+      time_t deadline = now + days(taskdeadline_date);
       Task *newT = newTask(taskname, now, deadline, taskpriority, 0);
       if (listT == NULL) {
         listT = llistNew(newT, cmpTaskN);