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Latitude: 51.508333
Longitude: -0.125278
Time Zone: America-US/New_York
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October 2025
delete iconadd icon1825 days until Mole Day
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Thursday October 23, 2025 (10/23/2025) at <a class='DU_date_ref_link' href='http://en.wikipedia.org/wiki/Midnight' title='midnight (00:00) before noon on this date'>midnight</a>
Method: October 23rd on Gregorian calendar
Length: 1 day
Period: 1 year

Mole Day is an unofficial holiday celebrated among chemists on October 23, between 6:02 AM and 6:02 PM,[1][2][3] making the date 6:02 10/23 in the American style of writing dates. The time and date are derived from Avogadro's number, which is approximately 6.02×1023, defining the number of particles (atoms or molecules) in one mole of substance, one of the seven base SI units.

Mole Day originated in an article in The Science Teacher in the early 1980s.[4] Inspired by this article, Maurice Oehler, now a retired high school chemistry teacher from Prairie du Chien, Wisconsin, founded the National Mole Day Foundation (NMDF) on May 15, 1991.[4]

October 2026
delete iconadd icon2190 days until Mole Day
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Friday October 23, 2026 (10/23/2026) at <a class='DU_date_ref_link' href='http://en.wikipedia.org/wiki/Midnight' title='midnight (00:00) before noon on this date'>midnight</a>
October 2027
delete iconadd icon2555 days until Mole Day
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Saturday October 23, 2027 (10/23/2027) at <a class='DU_date_ref_link' href='http://en.wikipedia.org/wiki/Midnight' title='midnight (00:00) before noon on this date'>midnight</a>
October 2028
delete iconadd icon2921 days until Mole Day
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Monday October 23, 2028 (10/23/2028) at <a class='DU_date_ref_link' href='http://en.wikipedia.org/wiki/Midnight' title='midnight (00:00) before noon on this date'>midnight</a>
October 2029
delete iconadd icon3286 days until Mole Day
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Tuesday October 23, 2029 (10/23/2029) at <a class='DU_date_ref_link' href='http://en.wikipedia.org/wiki/Midnight' title='midnight (00:00) before noon on this date'>midnight</a>
October 2030
delete iconadd icon3651 days until Mole Day
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Wednesday October 23, 2030 (10/23/2030) at <a class='DU_date_ref_link' href='http://en.wikipedia.org/wiki/Midnight' title='midnight (00:00) before noon on this date'>midnight</a>
October 2031
delete iconadd icon4016 days until Mole Day
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Thursday October 23, 2031 (10/23/2031) at <a class='DU_date_ref_link' href='http://en.wikipedia.org/wiki/Midnight' title='midnight (00:00) before noon on this date'>midnight</a>
October 2032
delete iconadd icon4382 days until Mole Day
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Saturday October 23, 2032 (10/23/2032) at <a class='DU_date_ref_link' href='http://en.wikipedia.org/wiki/Midnight' title='midnight (00:00) before noon on this date'>midnight</a>
October 2033
delete iconadd icon4747 days until Mole Day
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Sunday October 23, 2033 (10/23/2033) at <a class='DU_date_ref_link' href='http://en.wikipedia.org/wiki/Midnight' title='midnight (00:00) before noon on this date'>midnight</a>
October 2034
delete iconadd icon5112 days until Mole Day
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Monday October 23, 2034 (10/23/2034) at <a class='DU_date_ref_link' href='http://en.wikipedia.org/wiki/Midnight' title='midnight (00:00) before noon on this date'>midnight</a>

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