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diff --git a/Firestore/Source/Core/FSTTimestamp.h b/Firestore/Source/Core/FSTTimestamp.h
new file mode 100644
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+++ b/Firestore/Source/Core/FSTTimestamp.h
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+/*
+ * 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>
+
+NS_ASSUME_NONNULL_BEGIN
+
+/**
+ * An FSTTimestamp represents an absolute time from the backend at up to nanosecond precision.
+ * An FSTTimestamp is represented in terms of UTC and does not have an associated timezone.
+ */
+@interface FSTTimestamp : NSObject <NSCopying>
+
+- (instancetype)init NS_UNAVAILABLE;
+
+/**
+ * Creates a new timestamp.
+ *
+ * @param seconds the number of seconds since epoch.
+ * @param nanos the number of nanoseconds after the seconds.
+ */
+- (instancetype)initWithSeconds:(int64_t)seconds nanos:(int32_t)nanos NS_DESIGNATED_INITIALIZER;
+
+/** Creates a new timestamp with the current date / time. */
++ (instancetype)timestamp;
+
+/** Creates a new timestamp from the given date. */
++ (instancetype)timestampWithDate:(NSDate *)date;
+
+/** Returns a new NSDate corresponding to this timestamp. This may lose precision. */
+- (NSDate *)approximateDateValue;
+
+/**
+ * Converts the given date to a an ISO 8601 timestamp string, useful for rendering in JSON.
+ *
+ * ISO 8601 dates times in UTC look like this: "1912-04-14T23:40:00.000000000Z".
+ *
+ * @see http://www.ecma-international.org/ecma-262/6.0/#sec-date-time-string-format
+ */
+- (NSString *)ISO8601String;
+
+- (NSComparisonResult)compare:(FSTTimestamp *)other;
+
+/**
+ * Represents seconds of UTC time since Unix epoch 1970-01-01T00:00:00Z.
+ * Must be from 0001-01-01T00:00:00Z to 9999-12-31T23:59:59Z inclusive.
+ */
+@property(nonatomic, assign, readonly) int64_t seconds;
+
+/**
+ * Non-negative fractions of a second at nanosecond resolution. Negative second values with
+ * fractions must still have non-negative nanos values that count forward in time.
+ * Must be from 0 to 999,999,999 inclusive.
+ */
+@property(nonatomic, assign, readonly) int32_t nanos;
+
+@end
+
+NS_ASSUME_NONNULL_END