1 files changed, 35 insertions, 0 deletions
diff --git a/Firebase/Database/FClock.h b/Firebase/Database/FClock.h
new file mode 100644
index 0000000..1924ad4
--- /dev/null
+++ b/Firebase/Database/FClock.h
@@ -0,0 +1,35 @@
+/*
+ * Copyright 2017 Google
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#import <Foundation/Foundation.h>
+
+@protocol FClock <NSObject>
+
+- (NSTimeInterval)currentTime;
+
+@end
+
+@interface FSystemClock : NSObject<FClock>
+
++ (FSystemClock *)clock;
+
+@end
+
+@interface FOffsetClock : NSObject<FClock>
+
+- (id)initWithClock:(id<FClock>)clock offset:(NSTimeInterval)offset;
+
+@end