What Time Zone Is Alcalá de Henares In?
Alcalá de Henares operates on Europe/Madrid, abbreviated as GMT+1, which is currently UTC+01:00 from Coordinated Universal Time. The IANA Time Zone Database (also known as the tz database or zoneinfo) records this under the identifier Europe/Madrid. That identifier is what your phone, laptop, and every major web service uses when they display a localized time for Alcalá de Henares.
The designation Europe/Madrid 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: Alcalá de Henares vs. The World
The current UTC offset in Alcalá de Henares is UTC+01:00. This means Alcalá de Henares time is 01:00 hours ahead of Coordinated Universal Time. To quickly convert: if it's 12:00 UTC right now, it's 11:48 local time in Alcalá de Henares.
Relative to other major cities: Alcalá de Henares is 6 hours ahead of New York, and 1 hours ahead of 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 Alcalá de Henares
Standard business hours in Alcalá de Henares run from 09:00 to 18:00 local time (Europe/Madrid). In UTC, that window is 08:48 to 17:48 UTC. If you're trying to schedule a call with someone in Alcalá de Henares:
- From New York: the Alcalá de Henares business day runs 03:48 to 12:48 New York time.
- From London: the Alcalá de Henares business day runs 08:48 to 17:48 London time.
Use the hour-by-hour conversion table above for the full 24-hour breakdown.
Daylight Saving Time in Alcalá de Henares
The DST indicator above shows whether Alcalá de Henares 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 Europe/Madrid 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 Alcalá de Henares
Today in Alcalá de Henares (40.5°N, 3.4°W), sunrise is approximately 06:46 and sunset is approximately 18:05 local time (Europe/Madrid). 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 40.5° latitude, Alcalá de Henares's day length varies by several hours between summer and winter solstice.
Best Time to Call Alcalá de Henares from Abroad
Standard business hours in Alcalá de Henares run 09:00 to 18:00 local time (Europe/Madrid). For international callers, the ideal window is 10:00 to 16:00 Alcalá de Henares time : after the morning rush and before the end-of-day slowdown. In UTC, this translates to 09:48 to 15:48 UTC. Avoid calling before 09:00 or after 20:00 Alcalá de Henares time, these windows fall outside acceptable business etiquette in most professional settings. If you are calling from New York,Alcalá de Henares business hours correspond to 03:48 to 12:48 Eastern time. From London, that same window is 08:48 to 17:48 GMT/BST.
Alcalá de Henares Time vs Major World Cities
Right now, Alcalá de Henares (UTC+01:00) is offset from major business hubs as follows:
- New York: Alcalá de Henares is 6 hours ahead of New York right now (UTC-05:00).
- London: Alcalá de Henares is 1 hour ahead of London right now (UTC+00:00).
- Dubai: Alcalá de Henares is 3 hours behind Dubai right now (UTC+04:00).
- Singapore: Alcalá de Henares is 7 hours behind Singapore right now (UTC+08:00).
- Tokyo: Alcalá de Henares is 8 hours behind Tokyo right now (UTC+09:00).
- Sydney: Alcalá de Henares is 10 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 Alcalá de Henares
Alcalá de Henares sits at 40.4821°N, -3.3600°W. Solar noon, the moment the sun reaches its highest point, occurs at approximately 12:48 local time, when the sun crosses the meridian above Alcalá de Henares. The IANA timezone Europe/Madrid groups Alcalá de Henares 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.
Alcalá de Henares: Size, Population, and Location
Alcalá de Henares has a population of approximately 193,751 people, placing it among significant regional cities. The city sits at 40°28'N, 3°21'W (decimal: 40.4821°, -3.3600°),40.5 degrees north of the equator.
At 40.5° latitude, Alcalá de Henares experiences moderate seasonal variation in day length, expect roughly 9-10 hours of daylight in winter and 14-16 hours in summer. Today, Alcalá de Henares sees sunrise at 06:46 and sunset at 18:05 local time. The IANA timezone Europe/Madrid groups Alcalá de Henares 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: Alcalá de Henares and Key Partners
Alcalá de Henares's standard working day (09:00–18:00 local, Europe/Madrid) translates to different hours for common international partners:
- San Francisco (America/Los_Angeles): Alcalá de Henares's workday runs 00:48 to 09:48 Pacific time.
- Berlin (Europe/Berlin): Alcalá de Henares's workday runs 09:48 to 18:48 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.