From 9ddf32971f99b7c8ee8455b3ac44a81523a1354a Mon Sep 17 00:00:00 2001
From: "Nathan.fooo" <86001920+appflowy@users.noreply.github.com>
Date: Tue, 5 Mar 2024 15:21:45 +0800
Subject: [PATCH] fix: underflow (#370)

---
 libs/client-api/src/collab_sync/sync_control.rs | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/libs/client-api/src/collab_sync/sync_control.rs b/libs/client-api/src/collab_sync/sync_control.rs
index d790d3df..c7a5cc67 100644
--- a/libs/client-api/src/collab_sync/sync_control.rs
+++ b/libs/client-api/src/collab_sync/sync_control.rs
@@ -433,8 +433,13 @@ struct LastSyncTime {
 
 impl LastSyncTime {
   fn new() -> Self {
+    let now = Instant::now();
+    let one_hour = Duration::from_secs(3600);
+    // Use checked_sub to safely attempt subtraction, falling back to 'now' if underflow would occur
+    let one_hour_ago = now.checked_sub(one_hour).unwrap_or(now);
+
     LastSyncTime {
-      last_sync: Mutex::new(Instant::now() - Duration::from_secs(3600)),
+      last_sync: Mutex::new(one_hour_ago),
     }
   }