Tools/TestWebKitAPI/Tests/WTF/DateMath.cpp

/*
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#include "config.h"

#include "Test.h"
#include <wtf/DateMath.h>

namespace TestWebKitAPI {

// Note: The results of these function look weird if you do not understand the following mappings:
// dayOfWeek: [0, 6] 0 being Monday, day: [1, 31], month: [0, 11], year: ex: 2011,
// hours: [0, 23], minutes: [0, 59], seconds: [0, 59], utcOffset: [-720,720].

TEST(WTF_DateMath, dateToDaysFrom1970)
{
    EXPECT_EQ(0.0, dateToDaysFrom1970(1970, 0, 1));
    EXPECT_EQ(157.0, dateToDaysFrom1970(1970, 5, 7));
    EXPECT_EQ(-145.0, dateToDaysFrom1970(1969, 7, 9));
    EXPECT_EQ(16322, dateToDaysFrom1970(2014, 8, 9));
}


TEST(WTF_DateMath, isLeapYear)
{
    EXPECT_TRUE(isLeapYear(1804));
    EXPECT_FALSE(isLeapYear(1900));
    EXPECT_TRUE(isLeapYear(1968));
    EXPECT_TRUE(isLeapYear(1976));
    EXPECT_TRUE(isLeapYear(2000));
    EXPECT_FALSE(isLeapYear(2010));
    EXPECT_TRUE(isLeapYear(2012));
    EXPECT_FALSE(isLeapYear(2100));
}

TEST(WTF_DateMath, msToYear)
{
    EXPECT_EQ(1962, msToYear(-220953600000));
    EXPECT_EQ(1970, msToYear(0));
    EXPECT_EQ(1970, msToYear(100));
    EXPECT_EQ(1977, msToYear(220953600000));
    EXPECT_EQ(2013, msToYear(1365318000000));
}

TEST(WTF_DateMath, msToDays)
{
    EXPECT_EQ(0, msToDays(0));
    EXPECT_EQ(2557, msToDays(220953600000));
    EXPECT_EQ(255, msToDays(22095360000));
    EXPECT_EQ(25, msToDays(2209536000));
    EXPECT_EQ(2, msToDays(220953600));
    EXPECT_EQ(0, msToDays(22095360));
    EXPECT_EQ(0, msToDays(2209536));
}

TEST(WTF_DateMath, msToMinutes)
{
    EXPECT_EQ(0, msToMinutes(0));
    EXPECT_EQ(0, msToMinutes(220953600000));
    EXPECT_EQ(36, msToMinutes(22095360000));
    EXPECT_EQ(36, msToMinutes(22095360000));
    EXPECT_EQ(45, msToMinutes(2209536000));
    EXPECT_EQ(22, msToMinutes(220953600));
    EXPECT_EQ(8, msToMinutes(22095360));
    EXPECT_EQ(36, msToMinutes(2209536));
}

TEST(WTF_DateMath, msToHours)
{
    EXPECT_EQ(0, msToHours(0));
    EXPECT_EQ(8, msToHours(220953600000));
    EXPECT_EQ(17, msToHours(22095360000));
    EXPECT_EQ(13, msToHours(2209536000));
    EXPECT_EQ(13, msToHours(220953600));
    EXPECT_EQ(6, msToHours(22095360));
    EXPECT_EQ(0, msToHours(2209536));
}

TEST(WTF_DateMath, dayInYear)
{
    EXPECT_EQ(59, dayInYear(2015, 2, 1));
    EXPECT_EQ(60, dayInYear(2012, 2, 1));
    EXPECT_EQ(0, dayInYear(2015, 0, 1));
    EXPECT_EQ(31, dayInYear(2015, 1, 1));
}

TEST(WTF_DateMath, monthFromDayInYear)
{
    EXPECT_EQ(2, monthFromDayInYear(59, false));
    EXPECT_EQ(1, monthFromDayInYear(59, true));
    EXPECT_EQ(2, monthFromDayInYear(60, true));
    EXPECT_EQ(0, monthFromDayInYear(0, false));
    EXPECT_EQ(0, monthFromDayInYear(0, true));
    EXPECT_EQ(1, monthFromDayInYear(31, true));
    EXPECT_EQ(1, monthFromDayInYear(31, false));
}

TEST(WTF_DateMath, dayInMonthFromDayInYear)
{
    EXPECT_EQ(1, dayInMonthFromDayInYear(0, false));
    EXPECT_EQ(1, dayInMonthFromDayInYear(0, true));
    EXPECT_EQ(1, dayInMonthFromDayInYear(59, false));
    EXPECT_EQ(29, dayInMonthFromDayInYear(59, true));
    EXPECT_EQ(1, dayInMonthFromDayInYear(60, true));
    EXPECT_EQ(1, dayInMonthFromDayInYear(0, false));
    EXPECT_EQ(1, dayInMonthFromDayInYear(0, true));
    EXPECT_EQ(31, dayInMonthFromDayInYear(30, true));
    EXPECT_EQ(31, dayInMonthFromDayInYear(30, false));
    EXPECT_EQ(31, dayInMonthFromDayInYear(365, true));
    EXPECT_EQ(32, dayInMonthFromDayInYear(365, false));
    EXPECT_EQ(32, dayInMonthFromDayInYear(366, true));
}

TEST(WTF_DateMath, calculateLocalTimeOffset)
{
    // DST Start: April 30, 1967 (02:00 am)
    LocalTimeOffset dstStart1967 = calculateLocalTimeOffset(-84301200000, WTF::LocalTime);
    EXPECT_TRUE(dstStart1967.isDST);
    EXPECT_EQ(-25200000, dstStart1967.offset);

    // November 1, 1967 (02:00 am)
    LocalTimeOffset dstAlmostEnd1967 = calculateLocalTimeOffset(-68317200000, WTF::LocalTime);
    EXPECT_TRUE(dstAlmostEnd1967.isDST);
    EXPECT_EQ(-25200000, dstAlmostEnd1967.offset);

    // DST End: November 11, 1967 (02:00 am)
    LocalTimeOffset dstEnd1967 = calculateLocalTimeOffset(-67536000000, WTF::LocalTime);
    EXPECT_FALSE(dstEnd1967.isDST);
    EXPECT_EQ(-25200000, dstStart1967.offset);

    // DST Start: April 3, 1988 (02:00 am)
    LocalTimeOffset dstStart1988 = calculateLocalTimeOffset(576054000000, WTF::LocalTime);
    EXPECT_TRUE(dstStart1988.isDST);
    EXPECT_EQ(-25200000, dstStart1988.offset);

    // DST End: November 4, 2012 (02:00 am)
    LocalTimeOffset dstEnd2012 = calculateLocalTimeOffset(1352012400000, WTF::LocalTime);
    EXPECT_FALSE(dstEnd2012.isDST);
    EXPECT_EQ(-28800000, dstEnd2012.offset);

    // DST Begin: March 8, 2015
    LocalTimeOffset dstBegin2015 = calculateLocalTimeOffset(1425801600000, WTF::LocalTime);
    EXPECT_TRUE(dstBegin2015.isDST);
    EXPECT_EQ(-25200000, dstBegin2015.offset);

    LocalTimeOffset dstBegin2015UTC = calculateLocalTimeOffset(1425801600000, WTF::UTCTime);
    EXPECT_FALSE(dstBegin2015UTC.isDST);
    EXPECT_EQ(-28800000, dstBegin2015UTC.offset);

    // DST End: November 1, 2015
    LocalTimeOffset dstEnd2015 = calculateLocalTimeOffset(1446361200000, WTF::LocalTime);
    EXPECT_FALSE(dstEnd2015.isDST);
    EXPECT_EQ(-28800000, dstEnd2015.offset);

    // DST Begin: March 13, 2016
    LocalTimeOffset dstBegin2016 = calculateLocalTimeOffset(1458111600000, WTF::LocalTime);
    EXPECT_TRUE(dstBegin2016.isDST);
    EXPECT_EQ(-25200000, dstBegin2016.offset);

    // DST End: November 6, 2016
    LocalTimeOffset dstEnd2016 = calculateLocalTimeOffset(1478415600000, WTF::LocalTime);
    EXPECT_FALSE(dstEnd2016.isDST);
    EXPECT_EQ(-28800000, dstEnd2016.offset);

    // DST Begin: March 12, 2017
    LocalTimeOffset dstBegin2017 = calculateLocalTimeOffset(1489305600000, WTF::LocalTime);
    EXPECT_TRUE(dstBegin2017.isDST);
    EXPECT_EQ(-25200000, dstBegin2017.offset);

    // DST End: November 5, 2017
    LocalTimeOffset dstEnd2017 = calculateLocalTimeOffset(1509865200000, WTF::LocalTime);
    EXPECT_FALSE(dstEnd2017.isDST);
    EXPECT_EQ(-28800000, dstEnd2017.offset);

    // DST Begin: March 11, 2018
    LocalTimeOffset dstBegin2018 = calculateLocalTimeOffset(1520755200000, WTF::LocalTime);
    EXPECT_TRUE(dstBegin2018.isDST);
    EXPECT_EQ(-25200000, dstBegin2018.offset);

    // DST End: November 4, 2018
    LocalTimeOffset dstEnd2018 = calculateLocalTimeOffset(1541314800000, WTF::LocalTime);
    EXPECT_FALSE(dstEnd2018.isDST);
    EXPECT_EQ(-28800000, dstEnd2018.offset);
}

} // namespace TestWebKitAPI