date: the particular day, month, or year (usually according to the Gregorian calendar) that an event occurred
calendar year: the year (reckoned from January 1 to December 31) according to Gregorian calendar
mexican sunflower: any plant of the genus Tithonia; tall coarse herbs or shrubs of Mexico to Panama having large flower heads resembling sunflowers with yellow disc florets and golden-yellow to orange-scarlet rays