diff --git a/core/time.c b/core/time.c
index cb0c607..b69bbbc 100644
--- a/core/time.c
+++ b/core/time.c
@@ -11,3 +11,18 @@ unsigned int jiffies_to_usecs(const unsigned long j)
 {
     return (1000000L / HZ) * j;
 }
+
+unsigned long msecs_to_jiffies(const unsigned int m)
+{
+#if HZ >= 1000 && !(HZ % 1000)
+    return m * (HZ / 1000L);
+#else
+    // This could overflow
+    return (m * HZ) / 1000L;
+#endif
+}
+
+unsigned long usecs_to_jiffies(const unsigned int u){
+    // This could overflow
+    return (u * HZ) / 1000000L;
+}
diff --git a/core/time.h b/core/time.h
index 302aa94..699b33d 100644
--- a/core/time.h
+++ b/core/time.h
@@ -48,3 +48,5 @@ extern unsigned long volatile jiffies;
 
 unsigned int jiffies_to_msecs(const unsigned long j);
 unsigned int jiffies_to_usecs(const unsigned long j);
+unsigned long msecs_to_jiffies(const unsigned int m);
+unsigned long usecs_to_jiffies(const unsigned int u);