The Temple is Complete and Passover is Celebrated
The Temple was completed in 515 BCE.
Ezra 6:15
The House was finished on the third day of the month Adar, which was in the sixth year of the reign of Darius the king.
A month and a half later they were able again to celebrate Passover.
Ezra 6:19
The returned exiles celebrated the Passover on the fourteenth day of the first month.
Overview
In the Bible
The house was finished on the third of the month of Adar in the sixth year of the reign of King Darius.
The returned exiles celebrated the Passover on the fourteenth day of the first month.
"וְשֵׁיצִיא֙ בַּיְתָ֣ה דְנָ֔ה עַ֛ד י֥וֹם תְּלָתָ֖ה לִירַ֣ח אֲדָ֑ר דִּי־הִ֣יא שְׁנַת־שֵׁ֔ת לְמַלְכ֖וּת דָּֽרְיָ֥וֶשׁ מַלְכָּֽא ... וַיַּֽעֲשׂ֥וּ בְנֵֽי־הַגּוֹלָ֖ה אֶת־הַפָּ֑סַח בְּאַרְבָּעָ֥ה עָשָׂ֖ר לַחֹ֥דֶשׁ הָֽרִאשֽׁוֹן."