We turn back the clocks. The Sun keeps its schedule. Discover how the Maya and Aztecs used sunlight, seasons, and calendars to help feed their communities.
On Sunday, November 1, 2026, most Americans got to repeat an hour. At 2 a.m., clocks returned to 1 a.m. as daylight saving time ended. The Sun, naturally, did not get the memo. [1]
That small change raises a big question: how did people keep track of time before kitchen clocks, phone alarms, and reminders to “fall back”?
For the ancient Maya and Aztecs, the answer involved much more than knowing when to wake up. Time helped connect farming, festivals, and beliefs about the world. Get the growing season wrong, and dinner could be at risk.
At MexGrocer’s MexCocina, we often follow food stories back to their roots. This one takes us from cornfields and mountain sunrises to Spanish church bells—and finally to the masa, beans, and chiles in today’s kitchens.
The short answer
The ancient Maya and Aztecs did not move clocks forward or backward for daylight saving time. Their calendars tracked days, seasons, and sacred events. Both systems helped people organize life, but they worked very differently from our modern clock change. [1] [4]
Why Do We Change the Clocks in the United States?
Daylight saving time moves clocks ahead during part of the year. This puts more daylight into the evening by the clock. Moving back in fall restores standard time. Neither change creates more sunshine. [1]
The United States first adopted daylight saving time nationwide in 1918, during World War I. Saving electricity was one reason given for the change. Helping farmers was not. In fact, many farmers opposed it. [2]
Here is why: a clock cannot dry a wet field. Workers might arrive an hour earlier, but crops could still be covered in morning dew. Stores and banks could also close while farmers were busy harvesting. Nature and the town’s schedule did not always agree. [2a]
Wait—Farmers Wanted It Repealed?
Yes. Farm groups helped push for the repeal of the federal daylight saving rule in 1919, even overcoming President Woodrow Wilson’s veto. The idea that the change was invented for farmers is a stubborn myth. [2]
The Uniform Time Act of 1966 later set a common framework for daylight saving time. States can choose to stay on standard time, but those that observe daylight saving time must follow the federal schedule. [3]
Before Spanish Colonization: Watching the Sky, Feeding the Community
The Maya and Aztecs were different peoples with different histories. “Maya” includes many communities, not one single empire. In this article, “Mexica” means the people centered on Tenochtitlan, who are often called Aztecs.
Both traditions used a 365-day calendar alongside a 260-day count. These calendars helped organize yearly activities and religious life. [4]
The Maya Had More Than One Calendar
The Maya Haab had eighteen periods of twenty days, plus five extra days called Wayeb. That adds up to 365 days. The sacred Tzolk’in paired twenty day signs with thirteen numbers, creating 260 different combinations. [5]
Used together, these counts formed the Calendar Round. The same pairing returned after fifty-two 365-day years. For longer stretches of history, the Maya also used the Long Count, which counted days over much larger periods. [5]
Think of the calendars as different schedules used at once. Today, one date can be a school day, a birthday, and a religious holiday. Maya dates also carried several kinds of meaning.
A Day When Your Shadow Almost Disappears
In the tropics, the Sun can pass directly overhead at noon twice a year. For a moment, an upright post can seem to lose its shadow. This is called a solar zenith passage. The dates depend on the location. [6]
Maya observers connected these solar patterns with the growing cycle of corn. The Smithsonian uses Copán as one example, linking the overhead Sun with planting and harvest periods. That does not mean every Maya farmer planted on the same day. Local rain, land, and corn varieties still mattered. [6]
Before There Was a Tortilla, There Was a Timing Decision
Someone had to decide when to plant the corn. That makes farming knowledge part of the story of Mexican food, right alongside the recipes passed from one generation to the next.
From Corn to Masa
Corn is the link between this calendar story and the kitchen. Maseca corn masa flour offers a modern way to prepare tortillas and other corn-based favorites. Explore masa and corn flour for your next meal.
View Product at MexGrocer.com →The Aztec Calendar Connected Farming and Festivals
The Mexica called their annual calendar the xiuhpohualli, or “year count.” Their 260-day count was the tonalpohualli, or “day count.” The annual calendar helped organize planting, harvests, and festivals. The shorter count helped guide religious decisions. [7]
Farming and faith were closely linked. A festival tied to the growing season could carry both practical and sacred meaning. [7]
Could a Mountain Tell You When to Plant?
A 2022 study in Proceedings of the National Academy of Sciences explored how mountains around the Basin of Mexico could help mark the year. Researchers studied where the Sun rose along the eastern horizon, including alignments at Mount Tlaloc. [8]
Their findings suggest that familiar peaks could serve as seasonal markers. As sunrise shifted along the horizon, observers could track the approach of important farming periods. [8]
Picture a mountain skyline acting like a giant calendar. It is a strong research explanation, although it does not settle every question about Mexica timekeeping or show that every farmer used the same method. [8]
A New Fire Every Fifty-Two Years
The Mexica marked a fifty-two-year cycle with the New Fire ceremony. It connected the renewal of time with the continuation of the world. Mexico’s National Institute of Indigenous Peoples identifies 1507 as the last pre-conquest celebration. [9]
That was a much bigger event than resetting an alarm. It shows how calendars could shape a community’s understanding of its place in the universe.
After Spanish Arrival: New Calendars, Church Bells, and Clocks
Spanish colonization brought new ways to name dates and measure hours. It also brought authorities who expected communities to follow those schedules. But Indigenous people already knew how to keep time. What followed was a mix of pressure, learning, and adaptation.
The Spanish Did Not Arrive With Today’s Calendar
At first, the Spanish used the Julian calendar. The Gregorian calendar used today came later, in 1582. The reform corrected a growing mismatch between calendar dates and the solar year, which affected the timing of Easter. [4]
Spain adopted the reform in 1582. A royal order followed in 1583 for Spain’s American territories, though news and instructions took time to arrive. Ten calendar dates were skipped where the reform took effect. People did not lose ten days of life; the dates changed. [10]
An Hour Back vs. Ten Dates Ahead
Our fall clock change repeats an hour on the clock. The Gregorian reform skipped date labels on the calendar. Both changed how people named time, while the Sun continued its usual course.
When the Whole Town Could Hear the Time
Church bells announced prayer times and helped set the daily rhythm of colonial towns. UNAM’s Institute of Historical Research explains that these religious schedules also shaped life beyond the church. [11]
You did not need your own clock to hear that a scheduled event had arrived. The people who controlled the bells had a powerful way to organize the day. Still, a bell could not bring rain or make corn ripen faster. [11]
Indigenous People Became Clockmakers, Too
Historian Ricardo Uribe documents Indigenous clockmakers in sixteenth-century central Mexico. They worked with mechanical clocks and helped adapt calendars and schedules. Town councils and government offices played an important role, along with religious institutions. [12]
Nahua speakers even developed a word for a clock: cemilhuitlapohualtepoztli. It combined ideas of counting, the passing of a day, and bell or iron. Indigenous workers were learning the new machines and finding words to describe them. [12]
Uribe also describes Nahua scribes updating calendar records after the Gregorian reform. This was not a simple story of one system replacing another overnight. Indigenous people helped translate between them. [12]
Maya Knowledge Continued in Books—and in Daily Life
The Codex Pérez, a later collection drawing on Maya Books of Chilam Balam, includes tables linking Indigenous and Christian calendars. Princeton University’s description also notes Maya and European ideas recorded together. [13]
Maya calendar traditions also continue today. The Smithsonian documents living Maya daykeepers and the use of sacred day counts in Guatemala. These traditions belong to the present as well as the past. [5]
The Harvest Connection: Corn, Beans, and Chiles in Both Countries
Corn, dry beans, and chile peppers are grown and harvested in both the United States and Mexico. They connect this history with farms working today. But there is no single “Mexican harvest day” or “U.S. planting day.” Weather, location, and crop type all matter. [15] [16] [19]
For a local example, Chihuahua’s 2026 farming guidance described different planting windows for corn, beans, and vegetables. It linked bean planting to the rainy season. A calendar helps farmers plan, but the field still has the final say. [18]
The products below bring those crop stories into a modern pantry. Their photos show items sold by MexGrocer; they do not identify which country grew the ingredients in a particular package.
Beans: A Familiar Crop on Both Sides of the Border
Dry beans appear in agricultural records in both countries. In the kitchen, they can become a pot of whole beans, a side of refried beans, or the filling for a simple meal. Explore MexGrocer’s bean selection to find a favorite. [15] [16]
Verde Valle Pinto Beans
A bag of dry pinto beans makes the farm-to-kitchen connection easy to see. Use these beans for a pot of frijoles or your own refried bean recipe.
View Product at MexGrocer.com →Chiles: Harvest Time Can Change What Reaches the Kitchen
Chile peppers offer another useful lesson in timing. New Mexico State University explains that green chiles are harvested at a different stage from peppers intended for red chile. Red chile fruit is allowed to turn fully red, and may dry partly or fully on the plant. [17]
Mexico also grows chile peppers. Once dried, chiles such as guajillo become pantry ingredients for sauces, marinades, and stews. For more ideas, read MexGrocer’s guide to Mexican spices and chiles. [16]
Tampico Dried Guajillo Chiles
These dried guajillo peppers bring red color and fruity chile flavor to sauces, adobos, soups, and stews. They are a modern pantry example of how a harvested crop can keep feeding people after the growing season ends.
View Product at MexGrocer.com →How Do These Ways of Keeping Time Compare?
| System | What It Tracks | Connection to Farming |
|---|---|---|
| U.S. daylight saving time | Clock hours in relation to daylight | Many farmers opposed the original change. |
| Ancient Maya calendars | Annual, sacred, and historical cycles | Solar patterns helped mark growing seasons. |
| Ancient Mexica calendars | Yearly activities and sacred days | Farming and seasonal festivals were linked. |
| Spanish colonial timekeeping | Christian dates and measured hours | New schedules existed alongside the needs of fields. |
Does Mexico Still Change Its Clocks?
Most of Mexico stopped changing clocks under a 2022 law. Seasonal clock changes remain in specified northern border areas, including Baja California. This is a modern policy decision, not a return to an ancient calendar. [14]
The Kitchen Clock Is Only Part of the Story
We may reset our clocks in November, but the food on our tables follows a much longer story. Before there can be tortillas, beans, or chile sauce, there must be planting, growing, and harvesting.
That is what makes time part of Mexican food history. The story includes people who watched the Sun, read the landscape, learned new tools, and passed their knowledge on. At MexGrocer, those connections help us appreciate the ingredients we cook with today.
Bring the Story to Your Table
Explore masa and corn flour, beans, and dried guajillo chiles at MexGrocer.com. For another ingredient story, read our history of menudo.
Frequently Asked Questions
Did the Maya and Aztecs use daylight saving time?
No. They used calendars and sky observations to organize days and seasons. Moving clocks by one hour is a different, modern practice.
Was daylight saving time created for farmers?
No. The U.S. adopted it nationwide in 1918 as a wartime measure. Many farm groups opposed the change.
Did Spanish clocks erase Indigenous calendars?
No. Colonial rule changed public schedules, but Indigenous people also adapted the new tools and preserved parts of their own calendar traditions.
Sources and Further Reading
Historical details and farming facts are drawn from the sources below. The article is written in original language.
[1] NIST: Daylight Saving Time Rules. Current U.S. rules and 2026 dates.
[2] Library of Congress: Daylight Saving Time. The 1918 adoption, agricultural opposition, and 1919 repeal.
[2a] U.S. House of Representatives: Time Travel—Daylight Saving Time and the House. Dew, labor, business schedules, and the repeal debate.
[3] U.S. Department of Transportation: Uniform Time. Standardization, federal authority, and state exemptions.
[4] Library of Congress: The Heavens and Time. Mesoamerican calendars and European calendar reform.
[5] Smithsonian National Museum of the American Indian: The Calendar System. Haab, Tzolk’in, Calendar Round, Long Count, and living traditions.
[6] Smithsonian: Sun, Corn, and the Calendar and educational transcript. Solar zenith passages and agriculture.
[7] Enrique Vela, Arqueología Mexicana: El calendario mexica. Calendar names, functions, and agricultural connections.
[8] Exequiel Ezcurra, Paula Ezcurra, and Ben Meissner: Ancient inhabitants of the Basin of Mexico kept an accurate agricultural calendar using sunrise observatories and mountain alignments, PNAS, 2022. University of California repository record.
[9] INPI: Un fuego nuevo, un ciclo nuevo. The fifty-two-year Mexica cycle and New Fire ceremony.
[10] Universidad del Pacífico, Estudios Indianos: Pragmática de los diez días del año. Gregorian reform and its transmission to Spanish America.
[11] UNAM Institute of Historical Research: Campanas y matracas… todo el tiempo en todas partes. Prayer hours, bells, and colonial authority.
[12] Ricardo Uribe: Indigenous Clockmakers, Schedules, and Quantitative Time in the Spanish Colonies (16th Century), Kronoscope 23, 145–176; published online 2024. Indigenous clockmakers, administrative schedules, Nahuatl vocabulary, and calendar adaptation.
[13] Princeton University Library: Codex Pérez. Manuscript catalog description of Indigenous and Christian calendrical material.
[14] Mexico’s Secretaría de Energía: En la República Mexicana ya no hay Horario de Verano and 2022 federal time-zone law. General abolition and northern-border exceptions; not a complete municipality-by-municipality guide.
[15] USDA: Crop Production 2025 Summary. U.S. corn and dry edible bean production.
[16] INEGI: Agricultura. Mexican corn, bean, and chile production.
[17] New Mexico State University: Chile. Green and red chile harvest stages.
[18] Government of Chihuahua: Spring–Summer Agricultural Cycle 2026. Local planting windows and rainfall.
[19] USDA: New Mexico Agricultural Statistics. U.S. chile production.