Method execute

tests/HostTests/modules/DateTime.cpp:14–138

	}

	void execute() override
	{
		Serial << _F("time_t is ") << sizeof(time_t) * 8 << _F(" bits") << endl;

		TEST_CASE("fromHttpDate()")
		{
			checkHttpDates(VALID_HTTP_DATE);
		}

		TEST_CASE("fromISO8601 (32-bit)")
		{
			checkIsoTimes(VALID_ISO_DATETIME, false);
		}

		TEST_CASE("fromISO8601 (time only)")
		{
			checkIsoTimes(VALID_ISO_TIME, true);
		}

		if(sizeof(time_t) == 8) {
			TEST_CASE("fromISO8601 (64-bit)")
			{
				checkIsoTimes(VALID_ISO_DATETIME64, false);
			}
		}

		TEST_CASE("fromISO8601 with offset")
		{
			auto check = [&](const String& strWithOffset, const String& strUtc, time_t time, int offsetMins) {
				DateTime dt;
				// Without zone, offset is applied to time
				CHECK(dt.fromISO8601(strWithOffset));
				REQUIRE_EQ(dt.toUnixTime(), time);
				REQUIRE_EQ(dt.toISO8601(), strUtc);
				// With zone, get local time plus offset
				DateTime::ZoneInfo zoneInfo;
				CHECK(dt.fromISO8601(strWithOffset, &zoneInfo));
				REQUIRE_EQ(dt.toUnixTime(), time + (offsetMins * 60));
				REQUIRE_EQ(zoneInfo.offsetMins, offsetMins);
				REQUIRE_EQ(dt.toISO8601(&zoneInfo), strWithOffset);
			};

			check(F("2024-05-22T06:28:15+12:45"), F("2024-05-21T17:43:15Z"), 1716313395, 12 * 60 + 45);
			check(F("2024-05-22T06:28:15-23:45"), F("2024-05-23T06:13:15Z"), 1716444795, -(23 * 60 + 45));
		}

		TEST_CASE("setTime")
		{
			checkSetTime(VALID_HTTP_DATE);
			checkSetTime(VALID_ISO_DATETIME);
			if(sizeof(time_t) == 8) {
				checkSetTime(VALID_ISO_DATETIME64);
			}
		}

		TEST_CASE("setTime speed check")
		{
			OneShotFastUs timer;