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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_COMMON_TIME_FORMAT_H__
#define CHROME_COMMON_TIME_FORMAT_H__
#pragma once
// This file defines methods to format time values as strings.
#include "base/string16.h"
namespace base {
class Time;
class TimeDelta;
}
class TimeFormat {
public:
// TimeElapsed, TimeRemaining and TimeRemainingShort functions:
// These functions return a localized string of approximate time duration. The
// conditions are simpler than PastTime since these functions are used for
// in-progress operations and users have different expectations of units.
// Returns times in elapsed-format: "3 mins ago", "2 days ago".
static string16 TimeElapsed(const base::TimeDelta& delta);
// Returns times in remaining-format: "3 mins left", "2 days left".
static string16 TimeRemaining(const base::TimeDelta& delta);
// Returns times in short-format: "3 mins", "2 days".
static string16 TimeRemainingShort(const base::TimeDelta& delta);
// For displaying a relative time in the past. This method returns either
// "Today", "Yesterday", or an empty string if it's older than that.
//
// TODO(brettw): This should be able to handle days in the future like
// "Tomorrow".
// TODO(tc): This should be able to do things like "Last week". This
// requires handling singluar/plural for all languages.
//
// The second parameter is optional, it is midnight of "Now" for relative day
// computations: Time::Now().LocalMidnight()
// If NULL, the current day's midnight will be retrieved, which can be
// slow. If many items are being processed, it is best to get the current
// time once at the beginning and pass it for each computation.
static string16 RelativeDate(const base::Time& time,
const base::Time* optional_midnight_today);
};
#endif // CHROME_COMMON_TIME_FORMAT_H__
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