From Adam until the Flood was one thousand six hundred and fifty-six years. And from the Flood until the Dispersion was three hundred and forty years, which is the year one thousand nine hundred and ninety-six from Creation. And from the Dispersion until our father Isaac was born was fifty-two years, which is the year two thousand and forty-eight from Creation. From when our father Isaac was born until Israel went out from Egypt was four hundred years, which is the year two thousand four hundred and forty-eight from Creation. And the forty years that Israel were in the wilderness, this is the year two thousand four hundred and eighty-eight from Creation.
The Ancient Jewish Timeline from Creation to Moses
Seder Olam Zutta 1:1
מֵאָדָם עַד הַמַּבּוּל אֶלֶף וְשֵׁשׁ מֵאוֹת וַחֲמִשִּׁים וְשֵׁשׁ שָׁנִים. וּמִן הַמַּבּוּל עַד הַפְּלַגָּה שְׁלֹשׁ מֵאוֹת וְאַרְבָּעִים שָׁנָה, הִיא שְׁנַת אֶלֶף תתקצ״ו לַיְצִירָה. וּמִן הַפְּלַגָּה עַד שֶׁנּוֹלַד יִצְחָק אָבִינוּ חֲמִשִּׁים וּשְׁתַּיִם שָׁנָה, הִיא שְׁנַת ב׳ אֲלָפִים מ״ח לַיְצִירָה. מִשֶּׁנּוֹלַד יִצְחָק אָבִינוּ עַד שֶׁיָּצְאוּ יִשְׂרָאֵל מִמִּצְרַיִם אַרְבַּע מֵאוֹת שָׁנָה, הִיא שְׁנַת ב׳ אֲלָפִים תמ״ח לַיְצִירָה. וְאַרְבָּעִים שָׁנָה שֶׁהָיוּ יִשְׂרָאֵל בַּמִּדְבָּר, הִיא שְׁנַת ב׳ אֲלָפִים תפ״ח לַיְצִירָה.