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Fix printing the last day in a 400 year cycle. #1767

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Fix printing the last day in a 400 year cycle. #1767

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6 changes: 6 additions & 0 deletions Release/src/utilities/asyncrt_utils.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -722,6 +722,12 @@ static compute_year_result compute_year_1601(int64_t secondsSince1601)
secondsSince1601 -= year400 * SecondsIn400Years;

int year100 = static_cast<int>(secondsSince1601 / SecondsIn100Years);
if (year100 == 4)
{
// this is the last day in a 400 year cycle
year100 = 3;
}

secondsSince1601 -= year100 * SecondsIn100Years;

int year4 = static_cast<int>(secondsSince1601 / SecondsIn4Years);
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4 changes: 4 additions & 0 deletions Release/tests/functional/utils/datetime.cpp
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Expand Up @@ -146,6 +146,10 @@ SUITE(datetime)

TEST(parsing_time_roundtrip_year_1604) { TestDateTimeRoundtrip(_XPLATSTR("1604-01-01T00:00:00Z")); }

TEST(parsing_time_roundtrip_year_2000_not_last_day) { TestDateTimeRoundtrip(_XPLATSTR("2000-12-30T00:00:00Z")); }

TEST(parsing_time_roundtrip_year_2000_last_day) { TestDateTimeRoundtrip(_XPLATSTR("2000-12-31T00:00:00Z")); }

TEST(emitting_time_correct_day)
{
const auto test = utility::datetime() + UINT64_C(132004507640000000); // 2019-04-22T23:52:44 is a Monday
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