The second quarter of 2018 starts on April 01 and ends three months later on June 30. A quarter means a fourth and refers to three sequenced months. The second quarter of a year always includes April, May and June. It is also sometimes depicted with Roman numerals or abbreviated like Q2 or Q2/2018.
The second quarter of the year on the Northern hemisphere is shaped by spring and the beginning of summer. On the Southern hemisphere again, this is autumn time and winter starts. The variable date of Easter can be a part of the second quarter, when the date in April instead of in March. The second quarter and spring time is strongly connected with falling in love and other positive feelings because on the Northern hemisphere the dark time of the year ends now.