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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef DOM_QUOTA_DATE_H_
#define DOM_QUOTA_DATE_H_
#include "mozilla/CheckedInt.h"
#include "prtime.h"
namespace mozilla::dom::quota {
namespace {
const int64_t kSecPerDay = 86400;
}
/**
* A lightweight utility class representing a date as the number of days since
* the Unix epoch (1970-01-01 UTC).
*
* This class is useful when full timestamp precision is not needed and only
* a compact representation is required, such as when storing the value in an
* int32_t field. An int32_t can safely represent dates out to the year ~5.8
* million, making this format ideal for tracking coarse-grained time values
* like origin maintenance dates, and similar use cases.
*
* Internally, the date is derived from PR_Now(), which returns microseconds
* since the epoch. This ensures consistency with other quota-related timestamp
* logic, such as origin last access time.
*/
class Date final {
public:
static Date FromDays(int32_t aValue) { return Date(aValue); }
static Date FromTimestamp(int64_t aTimestamp) {
CheckedInt32 value =
(CheckedInt64(aTimestamp) / PR_USEC_PER_SEC / kSecPerDay)
.toChecked<int32_t>();
MOZ_ASSERT(value.isValid());
return Date(value.value());
}
static Date Today() { return Date(FromTimestamp(PR_Now())); }
int32_t ToDays() const { return mValue; }
bool operator==(const Date& aOther) const { return mValue == aOther.mValue; }
bool operator!=(const Date& aOther) const { return mValue != aOther.mValue; }
bool operator<(const Date& aOther) const { return mValue < aOther.mValue; }
bool operator<=(const Date& aOther) const { return mValue <= aOther.mValue; }
bool operator>(const Date& aOther) const { return mValue > aOther.mValue; }
bool operator>=(const Date& aOther) const { return mValue >= aOther.mValue; }
private:
explicit Date(int32_t aValue) : mValue(aValue) {}
int32_t mValue;
};
} // namespace mozilla::dom::quota
#endif // DOM_QUOTA_DATE_H_
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