1 files changed, 23 insertions, 4 deletions
diff --git a/apps/web/src/lib/time.ts b/apps/web/src/lib/time.ts
index f24c5961..20e2ff6d 100644
--- a/apps/web/src/lib/time.ts
+++ b/apps/web/src/lib/time.ts
@@ -1,10 +1,14 @@
 // Time-related utility functions
 
+import { DEFAULT_FPS } from "@/stores/project-store";
+
+export type TimeCode = "MM:SS" | "HH:MM:SS" | "HH:MM:SS:CS" | "HH:MM:SS:FF";
+
 // Helper function to format time in various formats (MM:SS, HH:MM:SS, HH:MM:SS:CS, HH:MM:SS:FF)
 export const formatTimeCode = (
   timeInSeconds: number,
-  format: "MM:SS" | "HH:MM:SS" | "HH:MM:SS:CS" | "HH:MM:SS:FF" = "HH:MM:SS:CS",
-  fps = 30
+  format: TimeCode = "HH:MM:SS:CS",
+  fps = DEFAULT_FPS
 ): string => {
   const hours = Math.floor(timeInSeconds / 3600);
   const minutes = Math.floor((timeInSeconds % 3600) / 60);
@@ -26,8 +30,8 @@ export const formatTimeCode = (
 
 export const parseTimeCode = (
   timeCode: string,
-  format: "MM:SS" | "HH:MM:SS" | "HH:MM:SS:CS" | "HH:MM:SS:FF" = "HH:MM:SS:CS",
-  fps = 30
+  format: TimeCode = "HH:MM:SS:CS",
+  fps = DEFAULT_FPS
 ): number | null => {
   if (!timeCode || typeof timeCode !== "string") return null;
 
@@ -116,3 +120,18 @@ export const parseTimeCode = (
 
   return null;
 };
+
+export const guessTimeCodeFormat = (timeCode: string): TimeCode | null => {
+  if (!timeCode || typeof timeCode !== "string") return null;
+
+  const numbers = timeCode.split(":");
+
+  if (!numbers.every((n) => !isNaN(Number(n)))) return null;
+
+  if (numbers.length === 2) return "MM:SS";
+  if (numbers.length === 3) return "HH:MM:SS";
+  // todo: how to tell frames apart from cs?
+  if (numbers.length === 4) return "HH:MM:SS:FF";
+
+  return null;
+};