What Time Zone Is Ciudad Obregón In?
Ciudad Obregón operates on America/Hermosillo, abbreviated as GMT-7, which is currently UTC-07:00 from Coordinated Universal Time. The IANA Time Zone Database (also known as the tz database or zoneinfo) records this under the identifier America/Hermosillo. That identifier is what your phone, laptop, and every major web service uses when they display a localized time for Ciudad Obregón.
The designation America/Hermosillo 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: Ciudad Obregón vs. The World
The current UTC offset in Ciudad Obregón is UTC-07:00. This means Ciudad Obregón time is 07:00 hours behind Coordinated Universal Time. To quickly convert: if it's 12:00 UTC right now, it's 19:46 local time in Ciudad Obregón.
Relative to other major cities: Ciudad Obregón is -2 hours behind New York, and -7 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 Ciudad Obregón
Standard business hours in Ciudad Obregón run from 09:00 to 18:00 local time (America/Hermosillo). In UTC, that window is 16:46 to 01:46 UTC. If you're trying to schedule a call with someone in Ciudad Obregón:
- From New York: the Ciudad Obregón business day runs 11:46 to 20:46 New York time.
- From London: the Ciudad Obregón business day runs 16:46 to 01:46 London time.
Use the hour-by-hour conversion table above for the full 24-hour breakdown.
Daylight Saving Time in Ciudad Obregón
The DST indicator above shows whether Ciudad Obregón 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/Hermosillo 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 Ciudad Obregón
Today in Ciudad Obregón (27.5°N, 109.9°W), sunrise is approximately 06:45 and sunset is approximately 18:18 local time (America/Hermosillo). 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 27.5° latitude, Ciudad Obregón's day length varies by several hours between summer and winter solstice.
Best Time to Call Ciudad Obregón from Abroad
Standard business hours in Ciudad Obregón run 09:00 to 18:00 local time (America/Hermosillo). For international callers, the ideal window is 10:00 to 16:00 Ciudad Obregón time : after the morning rush and before the end-of-day slowdown. In UTC, this translates to 17:46 to 23:46 UTC. Avoid calling before 09:00 or after 20:00 Ciudad Obregón time, these windows fall outside acceptable business etiquette in most professional settings. If you are calling from New York,Ciudad Obregón business hours correspond to 11:46 to 20:46 Eastern time. From London, that same window is 16:46 to 01:46 GMT/BST.
Ciudad Obregón Time vs Major World Cities
Right now, Ciudad Obregón (UTC-07:00) is offset from major business hubs as follows:
- New York: Ciudad Obregón is 2 hours behind New York right now (UTC-05:00).
- London: Ciudad Obregón is 7 hours behind London right now (UTC+00:00).
- Dubai: Ciudad Obregón is 11 hours behind Dubai right now (UTC+04:00).
- Singapore: Ciudad Obregón is 15 hours behind Singapore right now (UTC+08:00).
- Tokyo: Ciudad Obregón is 16 hours behind Tokyo right now (UTC+09:00).
- Sydney: Ciudad Obregón is 18 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 Ciudad Obregón
Ciudad Obregón sits at 27.4864°N, -109.9408°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 Ciudad Obregón. The IANA timezone America/Hermosillo groups Ciudad Obregón 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.
Ciudad Obregón: Size, Population, and Location
Ciudad Obregón has a population of approximately 329,404 people, placing it among significant regional cities. The city sits at 27°29'N, 109°56'W (decimal: 27.4864°, -109.9408°),27.5 degrees north of the equator.
At 27.5° latitude, Ciudad Obregón experiences moderate seasonal variation in day length, expect roughly 9-10 hours of daylight in winter and 14-16 hours in summer. Today, Ciudad Obregón sees sunrise at 06:45 and sunset at 18:18 local time. The IANA timezone America/Hermosillo groups Ciudad Obregón 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: Ciudad Obregón and Key Partners
Ciudad Obregón's standard working day (09:00–18:00 local, America/Hermosillo) translates to different hours for common international partners:
- San Francisco (America/Los_Angeles): Ciudad Obregón's workday runs 08:46 to 17:46 Pacific time.
- Berlin (Europe/Berlin): Ciudad Obregón's workday runs 17:46 to 02:46 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.