diff --git a/Sources/CertLogic/Date+.swift b/Sources/CertLogic/Date+.swift
index a75dd01..b86d10b 100644
--- a/Sources/CertLogic/Date+.swift
+++ b/Sources/CertLogic/Date+.swift
@@ -54,13 +54,10 @@ extension Date {
   }()
   
   static let iso8601Formatter: ISO8601DateFormatter = {
-          let formatter = ISO8601DateFormatter()
-          formatter.formatOptions = [.withFullDate,
-                                            .withTime,
-                                            .withDashSeparatorInDate,
-                                            .withColonSeparatorInTime]
-          return formatter
-      }()
+    let formatter = ISO8601DateFormatter()
+    formatter.timeZone = TimeZone(abbreviation: "UTC")
+    return formatter
+  }()
 
   var ISO8601String: String { return Date.iso8601Full.string(from: self) }