Is it der, die or das Januar?

Sense 1

der

Meaning

[1] Common German, Austrian seldom: first 31-day month of the calendar year

[1] gemeindeutsch, österreichisch selten: erster, 31-tägiger Monat im Kalenderjahr

[1] January is the first month of the year.
[1] Der Januar ist der erste Monat im Jahr.

[1] "May life be for you every January
[1] „Mög’ das Leben alle Januare dir

Also appear as May! “[5]
Auch als Mai erſcheinen laſſen!“[5]

Grammar note

"The names of the months are heavily inflected . Special features: The dative-e no longer occurs: in January (not: in January).

Dictionary data includes material derived from Wiktionary. Wiktionary