diff --git a/compiler/src/generators/rust.ts b/compiler/src/generators/rust.ts
index 6601927..61a5e09 100644
--- a/compiler/src/generators/rust.ts
+++ b/compiler/src/generators/rust.ts
@@ -541,7 +541,7 @@ function rewriteRustExpr(
 
   // Step 1: Replace function calls
   let rust = expr
-    .replace(/\bnow\(\)/g, '0u64 /* TODO: use std::time::SystemTime */')
+    .replace(/\bnow\(\)/g, 'std::time::SystemTime::now().duration_since(std::time::UNIX_EPOCH).unwrap().as_secs()')
     .replace(/\blen\(([^)]+)\)/g, '$1.len()')
     .replace(/\blength\(([^)]+)\)/g, '$1.len()')
     .replace(/\bjoin\(([^,]+),\s*([^)]+)\)/g, '$1.join($2)')