enhance: use --since=@<unix_timestamp> instead of --since="yyyy/MM/dd HH:mm:ss"

Signed-off-by: leo <longshuang@msn.cn>

Author: love-linger

src/Commands/QueryCurrentBranchCommitHashes.cs

@@ -1,5 +1,4 @@
-using System;
-using System.Collections.Generic;
+using System.Collections.Generic;
 using System.Diagnostics;
 using System.Threading.Tasks;
 
@@ -9,10 +8,9 @@ public class QueryCurrentBranchCommitHashes : Command
     {
         public QueryCurrentBranchCommitHashes(string repo, ulong sinceTimestamp)
         {
-            var since = DateTime.UnixEpoch.AddSeconds(sinceTimestamp).ToLocalTime().ToString("yyyy/MM/dd HH:mm:ss");
             WorkingDirectory = repo;
             Context = repo;
-            Args = $"log --since={since.Quoted()} --format=%H";
+            Args = $"log --since=@{sinceTimestamp} --format=%H";
         }
 
         public async Task<HashSet<string>> GetResultAsync()