Recurrence pattern: Every year on the last Sunday of November.

International Shift Worker Sunday, observed worldwide every last Sunday of November, recognizes the contributions of shift workers who often work outside the standard 9-to-5 schedule. This observance was initiated by the US-based software company Deputy, which specializes in shift work management solutions. Shift work, which began in industrial manufacturing in the late 18th century, is prevalent in various industries, including healthcare, emergency services, and retail, where employees work in shifts to maintain operations around the clock. The day highlights the sacrifices made by these workers, who frequently miss special occasions and work long or odd hours to ensure the availability of goods and services. To show appreciation, individuals are encouraged to participate in the #ASimpleThanks movement, which includes actions like leaving extra tips or expressing gratitude to shift workers. The event aims to acknowledge the approximately 15-20% of the workforce in industrialized countries who are engaged in shift work.