"Calendar quarter" means the period of three consecutive calendar months ending on March 31st, June 30th, September 30th, or December 31st.
Wash. Admin. Code § 192-500-020
"Calendar quarter" means the period of three consecutive calendar months ending on March 31st, June 30th, September 30th, or December 31st.
Wash. Admin. Code § 192-500-020