https://www.biblegateway.com/passage/?search=1_Maccabees+1%3A10&version=NABRE
New American Bible (Revised Edition)
10 There sprang from these a sinful offshoot, Antiochus Epiphanes, son of
King Antiochus, once a hostage at Rome. He became king in the one hundred and
thirty-seventh year[a] of the kingdom of the Greeks.
Footnotes
1:10 The one hundred and thirty-seventh year: Antiochus IV seized the throne
in September, 175 B.C. Dates are given in this book according to the
beginning of the Seleucid era, which however was reckoned in two different
ways. Antiochians considered this date to be October, 312 B.C. (Syrian
calendar), while Babylonians and Jewish priests accepted April, 311 B.C. as
the commencement of the era (Temple calendar). The author of 1 Maccabees
dates political events by the Syrian calendar but religious events by the
Temple calendar. Accordingly, the civil New Year occurred variously in
September or October, the religious New Year in March or April.