You can check the Fiscal Year details under the Company Settings Pages.

fisical

The Quarter Periods are calculated in regards to how the Company Fiscal Year has been set-up.

So if the Fiscal Year is 1 JAN the quarters are calculated in the following way;

Q1: 01/01/YYYY…03/31/YYYY

Q2: 04/01/YYYY…06/30/YYYY

Q3: 07/01/YYYY…09/30/YYYY

Q4: 10/01/YYYY…12/31/YYYY