January to March inclusive !
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there are 3 months in quarter of a year
It depends which calendar you use
January, February,March
12 months in a year. So a quarter year is 3 months
Assuming a January to December year: First quarter: January, February, March, Second quarter: April, May, June, Third quarter: July, August, September, Fourth quarter: October, November, December. Note: There are 12 months in a full January to December year.