September 28

History and notable events

Across history this date has been linked with a number of widely recognised occurrences. One of the most frequently cited is Alexander Fleming's discovery of the antibacterial substance penicillin in 1928, an event often dated to late September. The date also coincides with the death of Louis Pasteur in 1895; Pasteur's work on rabies and microbiology is one reason later observances are placed on this date.

Observances and holidays

• World Rabies Day: commemorated on September 28 to raise awareness about rabies prevention and control, chosen in part to mark Pasteur's contributions.
• Feast of Saint Wenceslas: a Christian feast day observed in the Czech lands, associated with national and cultural remembrance.
• Various national and local holidays and commemorative days: many countries and communities use specific dates such as September 28 for civic, cultural or historical remembrances.

Seasonal and cultural context

In the Northern Hemisphere the date falls after the autumnal equinox and is commonly associated with early autumn activities; in the Southern Hemisphere it falls in early spring. The position of the date in the calendar makes it a practical moment for marking the passage of seasons, planning end-of-year events, and scheduling anniversaries.

How the day is used

Beyond fixed holidays, September 28 is used by organizations and communities as an anchor for campaigns, anniversaries and educational events. Because it appears reliably in both civil and ecclesiastical calendars, it serves as a focal point for historical retrospectives, scientific commemorations and local traditions.

Notable facts

As with any calendar date, the significance of September 28 varies by country, culture and discipline. It is simultaneously a routine calendar day—one of 365 or 366—and a marker for particular achievements, religious observances, and international awareness efforts.