File: time_view_utils.cc

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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "ash/system/time/time_view_utils.h"

#include "base/time/time.h"

namespace ash::time_view_utils {

namespace {

// Amount of slop to add into the timer to make sure we're into the next minute
// when the timer goes off.
const int kTimerSlopSeconds = 1;

}  // namespace

base::TimeDelta GetTimeRemainingToNextMinute(const base::Time& time) {
  // Try to set the timer to go off at the next change of the minute. We don't
  // want to have the timer go off more than necessary since that will cause
  // the CPU to wake up and consume power.
  base::Time::Exploded exploded;
  time.LocalExplode(&exploded);

  // Often this will be called at minute boundaries, and we'll actually want
  // 60 seconds from now.
  int seconds_left = 60 - exploded.second;
  if (seconds_left == 0) {
    seconds_left = 60;
  }

  // Make sure that the timer fires on the next minute. Without this, if it is
  // called just a teeny bit early, then it will skip the next minute.
  seconds_left += kTimerSlopSeconds;

  return base::Seconds(seconds_left);
}

}  // namespace ash::time_view_utils