What Time Zone Is San Mateo Atenco In?
San Mateo Atenco operates on America/Mexico_City, abbreviated as CST, which is currently UTC-06:00 from Coordinated Universal Time. The IANA Time Zone Database (also known as the tz database or zoneinfo) records this under the identifier America/Mexico_City. That identifier is what your phone, laptop, and every major web service uses when they display a localized time for San Mateo Atenco.
The designation America/Mexico_City follows the IANA convention of naming zones after the largest city in that timezone region. This naming is geographic, not political, it reflects where the zone is observed, not which government controls it. The full record for this zone, including historical UTC offsets and past DST rule changes, is publicly available in the Wikipedia list of tz database time zones.
UTC Offset: San Mateo Atenco vs. The World
The current UTC offset in San Mateo Atenco is UTC-06:00. This means San Mateo Atenco time is 06:00 hours behind Coordinated Universal Time. To quickly convert: if it's 12:00 UTC right now, it's 18:46 local time in San Mateo Atenco.
Relative to other major cities: San Mateo Atenco is -1 hours behind New York, and -6 hours behind London (including any DST difference currently in effect). These differences can shift by one hour during DST transitions, which occur on different dates in different regions.
Business Hours in San Mateo Atenco
Standard business hours in San Mateo Atenco run from 09:00 to 18:00 local time (America/Mexico_City). In UTC, that window is 15:46 to 00:46 UTC. If you're trying to schedule a call with someone in San Mateo Atenco:
- From New York: the San Mateo Atenco business day runs 10:46 to 19:46 New York time.
- From London: the San Mateo Atenco business day runs 15:46 to 00:46 London time.
Use the hour-by-hour conversion table above for the full 24-hour breakdown.
Daylight Saving Time in San Mateo Atenco
The DST indicator above shows whether San Mateo Atenco currently observes Daylight Saving Time. When DST is active, clocks advance by one hour, shifting the UTC offset by +1 and changing the abbreviation (for example, from EST to EDT in New York). When DST ends, clocks fall back and the offset returns to its standard value.
Not all countries observe DST. Japan, China, India, most of Africa, and several other nations maintain a fixed offset year-round. Whether America/Mexico_City observes DST, and the exact dates of transitions, is governed by the rules stored in the IANA Time Zone Database , the same source your phone uses. The Wikipedia article on Daylight Saving Time provides a global map and country-by-country breakdown of DST observance.
Sunrise and Sunset in San Mateo Atenco
Today in San Mateo Atenco (19.3°N, 99.5°W), sunrise is approximately 05:59 and sunset is approximately 17:41 local time (America/Mexico_City). These times are calculated using the Spencer equation for solar declination and apply to today's date. Latitude significantly affects day length: cities near the equator see roughly 12 hours of daylight year-round, while high-latitude cities experience dramatic swings, midsummer days can exceed 20 hours near the Arctic Circle, while midwinter days shrink to under 4 hours. At 19.3° latitude, San Mateo Atenco's day length varies modestly across the year, the tropics maintain relatively stable day lengths.
Best Time to Call San Mateo Atenco from Abroad
Standard business hours in San Mateo Atenco run 09:00 to 18:00 local time (America/Mexico_City). For international callers, the ideal window is 10:00 to 16:00 San Mateo Atenco time : after the morning rush and before the end-of-day slowdown. In UTC, this translates to 16:46 to 22:46 UTC. Avoid calling before 09:00 or after 20:00 San Mateo Atenco time, these windows fall outside acceptable business etiquette in most professional settings. If you are calling from New York,San Mateo Atenco business hours correspond to 10:46 to 19:46 Eastern time. From London, that same window is 15:46 to 00:46 GMT/BST.
San Mateo Atenco Time vs Major World Cities
Right now, San Mateo Atenco (UTC-06:00) is offset from major business hubs as follows:
- New York: San Mateo Atenco is 1 hour behind New York right now (UTC-05:00).
- London: San Mateo Atenco is 6 hours behind London right now (UTC+00:00).
- Dubai: San Mateo Atenco is 10 hours behind Dubai right now (UTC+04:00).
- Singapore: San Mateo Atenco is 14 hours behind Singapore right now (UTC+08:00).
- Tokyo: San Mateo Atenco is 15 hours behind Tokyo right now (UTC+09:00).
- Sydney: San Mateo Atenco is 17 hours behind Sydney right now (UTC+11:00).
These differences shift by one hour during DST transitions, which occur on different dates in different regions. Always verify the current offset before scheduling.
Geographic Location of San Mateo Atenco
San Mateo Atenco sits at 19.2676°N, -99.5321°W. Solar noon, the moment the sun reaches its highest point, occurs at approximately 12:46 local time, when the sun crosses the meridian above San Mateo Atenco. The IANA timezone America/Mexico_City groups San Mateo Atenco with nearby cities that share the same legal time, even if they sit at slightly different longitudes and therefore experience solar noon at slightly different moments. Zone boundaries are drawn along political borders and transportation corridors, not strict meridian lines.
San Mateo Atenco: Size, Population, and Location
San Mateo Atenco has a population of approximately 67,890 people, placing it among smaller but notable cities. The city sits at 19°16'N, 99°31'W (decimal: 19.2676°, -99.5321°),19.3 degrees north of the equator.
At 19.3° latitude, San Mateo Atenco experiences relatively stable day lengths year-round, tropical latitudes see roughly 11-13 hours of daylight in all seasons, with minimal variation between the summer and winter solstice. Today, San Mateo Atenco sees sunrise at 05:59 and sunset at 17:41 local time. The IANA timezone America/Mexico_City groups San Mateo Atenco with nearby cities that share the same legal clock, even if they sit at slightly different longitudes with marginally different solar noon times.
Working Hours Overlap: San Mateo Atenco and Key Partners
San Mateo Atenco's standard working day (09:00–18:00 local, America/Mexico_City) translates to different hours for common international partners:
- San Francisco (America/Los_Angeles): San Mateo Atenco's workday runs 07:46 to 16:46 Pacific time.
- Berlin (Europe/Berlin): San Mateo Atenco's workday runs 16:46 to 01:46 Central European time.
Overlap windows, times when both cities are within 09:00–18:00, are the practical window for real-time collaboration. Use the time difference tool on this site to find the shared working window for any pair of cities.