In this answer it is stated that Shivaratri is celebrated in Margashira masa (Dec). But Shivaratri festival is celebrated in Magha masa (Feb-Mar).
Why the celebration in a different month?
Are there any details on Magha masa celebrations?
Hinduism Stack Exchange is a question and answer site for followers of the Hindu religion and those interested in learning more about Hinduism. It only takes a minute to sign up.Sign up to join this community
As per Naradiya Samhita , Mahashivaratri is celebrated as below:
माघेकृष्णेचतुर्दश्यामादिदेवो महानिशि । शिवलिंगतयॊद्भूतः कॊटिसूर्यसमप्रभः ॥
On the 14th day of Magha month, Krishna Paksha, Mahadeva showed himself as shivalinga which was as resplendant as crores of suns. Hence that is the day on which Shivaratri is celebrated with Abhisheka to Shivalinga along with chanting of Rudram !