From 3cbf95efbf2c838aebaa9b260c630f5c47326d2a Mon Sep 17 00:00:00 2001
From: Quentin Jin <jianstm@gmail.com>
Date: Mon, 18 Mar 2019 21:21:09 +0800
Subject: [PATCH] Use `ISO8601DateFormatter`

---
 Sources/Schedule/Timeline.swift | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/Sources/Schedule/Timeline.swift b/Sources/Schedule/Timeline.swift
index 9cce011..35994aa 100644
--- a/Sources/Schedule/Timeline.swift
+++ b/Sources/Schedule/Timeline.swift
@@ -22,12 +22,13 @@ extension Timeline: CustomStringConvertible {
 
     /// A textual representation of this timeline.
     public var description: String {
-        let f = DateFormatter()
-        f.dateFormat = "yyyy-MM-dd HH:mm:ss.SSS"
+        enum Cache {
+            static let fmt = ISO8601DateFormatter()
+        }
 
         let desc = { (d: Date?) -> String in
             guard let d = d else { return "nil" }
-            return f.string(from: d)
+            return Cache.fmt.string(from: d)
         }
 
         return "Timeline: { " +