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// Copyright 2020 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#import <Foundation/Foundation.h>
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/**
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* Definition of a date that is used internally.
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*/
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@protocol FPRDate <NSObject>
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/** Returns the current time. */
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- (NSDate *)now;
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/**
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* Calculates the time difference between the provided date and returns the difference in seconds.
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*
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* @param date A date object used for reference.
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* @return Difference in time between the current date and the provided date in seconds. If the
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* current date is older than the provided date, the difference is returned in positive, else
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* negative.
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*/
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- (NSTimeInterval)timeIntervalSinceDate:(NSDate *)date;
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@end
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