Library import 16 (#2433)

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2 files changed, 13 insertions, 0 deletions

diff --git a/library/cpp/timezone_conversion/civil.h b/library/cpp/timezone_conversion/civil.h
index 5f331b3358..a50e0e7cb2 100644
--- a/library/cpp/timezone_conversion/civil.h
+++ b/library/cpp/timezone_conversion/civil.h
@@ -233,6 +233,14 @@ namespace NDatetime {
         return cctz::get_weekday(day);
     }
 
+    /** Returns the weekday by day.
+     * @param[in] second is a given seconds
+     * @return a weekday (enum)
+     */
+    CONSTEXPR_M TWeekday GetWeekday(const TCivilSecond& second) noexcept {
+        return cctz::get_weekday(second);
+    }
+
     /** Returns the TCivilDay that strictly follows or precedes the given
       * civil_day, and that falls on the given weekday.
       * @code
diff --git a/library/cpp/timezone_conversion/ut/civil_ut.cpp b/library/cpp/timezone_conversion/ut/civil_ut.cpp
index f91935ac49..2c3db3c3b3 100644
--- a/library/cpp/timezone_conversion/ut/civil_ut.cpp
+++ b/library/cpp/timezone_conversion/ut/civil_ut.cpp
@@ -103,6 +103,11 @@ Y_UNIT_TEST_SUITE(DateTime) {
         UNIT_ASSERT_VALUES_EQUAL(NDatetime::WeekdayOnTheWeek(d, NDatetime::TWeekday::wednesday), NDatetime::TCivilDay(2013, 1, 2));
         UNIT_ASSERT_VALUES_EQUAL(NDatetime::WeekdayOnTheWeek(d, NDatetime::TWeekday::friday), NDatetime::TCivilDay(2013, 1, 4));
     }
+    Y_UNIT_TEST(WeekdayFromCivilSecond) {
+        NDatetime::TCivilSecond s(2013, 1, 2, 10, 12, 9);
+        NDatetime::TWeekday wd = NDatetime::GetWeekday(s);
+        UNIT_ASSERT_VALUES_EQUAL(wd, NDatetime::TWeekday::wednesday);
+    }
     Y_UNIT_TEST(CivilUnit) {
         using namespace NDatetime;