18 May 2027

• 138th day of the year. There are then 227 days left in 2027.
• 20th Tuesday of 2027.
• on the 20th week of 2027 (using ISO standard week number calculation).
• Birthstone for this day: Emerald

There are no major holidays or observances in Australia for this date.

• Eid al Adha - End (Eid al Adha Ende) - South Africa, India, United Kingdom, Spain, Germany, Canada
• International Museum Day - Popular in: United States, India, United Kingdom, Canada
• Haitian Flag Day - United States
• Día de la Escarapela (Argentina) - Argentina
• Eid al Adha (End) - United States
• Dia Nacional do Combate ao Abuso e Exploração Sexual de Menores - Brazil