וּבַחֹ֙דֶשׁ֙ הַשֵּׁנִ֔י בְּשִׁבְעָ֧ה וְעֶשְׂרִ֛ים י֖וֹם לַחֹ֑דֶשׁ יָבְשָׁ֖ה הָאָֽרֶץ׃ (ס)
A miesiąca wtórego, dwudziestego siódmego dnia miesiąca, wyschła ziemia.
Rashi on Genesis
בשבעה ועשרים ON THE TWENTY-SEVENTH [OF THE MONTH] —The rain had begun to fall in the second month on the seventeenth day (Genesis 7:11): the ten days are those by which the solar year exceeds the lunar year; for the punishment of the generation of the Flood lasted a full (i.e. a solar) year (Genesis Rabbah 33:17).
Radak on Genesis
ובחודש השני בשבעה ועשרים יום לחודש, this is the month of Marcheshvan Our sages (at the end of section 33 of Bereshit Rabbah say that these 10 days represent the 10 days which the solar year is longer than the lunar year.