🔬 Science & Technology
Mole Day
Oct 23
Mole Day on October 23 celebrates Avogadro's number, a key unit in chemistry. Learn why it's celebrated from 6:02 a.m. to 6:02 p.m.
October 23, 2027: National Days & Holidays
October 23 is Mole Day. Here’s the story behind it and how to celebrate.
1observance on this date
296thday of 2027 (out of 365)
69days left in 2027
Weekly observances on October 23
2 week-long observances include October 23, 2027.
National Chemistry Week comes each October from the American Chemical Society. See how long it has run, the latest theme and simple ways to take part.
About National Chemistry WeekRed Ribbon Week is October 23–31 each year. See how a fallen DEA agent inspired it, how it became national in 1988 and how families can…
About Red Ribbon WeekOctober 23 at a glance
- What national days are on October 23, 2027?
- October 23, 2027 has 1 observance: Mole Day.
- Which weekly observances include October 23, 2027?
- October 23, 2027 falls during National Chemistry Week (Oct 17–23) and Red Ribbon Week (Oct 23–31).
- What day of the year is October 23?
- October 23 is the 296th day of 2027, out of 365 days.
- How many days are left in the year after October 23?
- There are 69 days left in 2027 after October 23.
- What day of the week is October 23, 2027?
- October 23, 2027 falls on a Saturday.
Key dates in October 2027
More in October
October 2027
SunMonTueWedThuFriSat1World Vegetarian Day2National Name Your Car Day3National Boyfriend Day4National Taco Day5World Teachers’ Day6National Noodle Day7National Frappe Day8National Pierogi Day9Leif Erikson Day10World Mental Health Day11International Day of the Girl12National Farmer’s Day13National Train Your Brain Day14National Dessert Day15Global Handwashing DayNational Boss’s Day1617National Pasta Day18National Chocolate Cupcake Day19Evaluate Your Life Day20International Sloth Day21Back to the Future Day22National Color Day23Mole Day24United Nations Day25International Artist Day26National Pumpkin Day27National Black Cat Day28National Chocolate Day29National Cat Day30National Candy Corn Day31Halloween