Rosario runs on UTC−3 every day of the year, with no daylight saving time.
Rosario and your time
Rosario at a glance
| Country | Argentina |
|---|---|
| Region | Santa Fe |
| Time zone | America/Argentina/Cordoba |
| UTC offset now | UTC−3 |
| Daylight saving time | Not observed since 2009 |
| Coordinates | 32.95° S, 60.64° W |
Time zone in Rosario
Rosario follows the America/Argentina/Cordoba time zone and stays on UTC−3 all year. Clocks here last changed for daylight saving time in 2009; the tz database lists no change after that.
Rosario is on the same time as the rest of Argentina, including the capital, Buenos Aires.
Clock changes in Rosario, 2026 and 2027
No clock changes are scheduled in Rosario for 2026 or 2027.
Time difference between Rosario and other cities
A 9:00 AM start in Rosario is 12:00 PM in London, 11:00 PM in Sydney and 4:00 AM in Los Angeles.
| City | Time now | Difference now | In January | In July | Shared office hours |
|---|---|---|---|---|---|
| Buenos Aires | --:-- | Same time | Same time | Same time | 8 h |
| New York (United States) | --:-- | 2 h behind | 2 h behind | 1 h behind | 6 h |
| Los Angeles (United States) | --:-- | 5 h behind | 5 h behind | 4 h behind | 3 h |
| London (United Kingdom) | --:-- | 3 h ahead | 3 h ahead | 4 h ahead | 5 h |
| Paris (France) | --:-- | 4 h ahead | 4 h ahead | 5 h ahead | 4 h |
| Dubai (United Arab Emirates) | --:-- | 7 h ahead | 7 h ahead | 7 h ahead | 1 h |
| Mumbai (India) | --:-- | 8 h 30 min ahead | 8 h 30 min ahead | 8 h 30 min ahead | None |
| Singapore | --:-- | 11 h ahead | 11 h ahead | 11 h ahead | None |
| Tokyo (Japan) | --:-- | 12 h ahead | 12 h ahead | 12 h ahead | None |
| Sydney (Australia) | --:-- | 14 h ahead | 14 h ahead | 13 h ahead | None |
| UTC | --:-- | 3 h ahead | 3 h ahead | 3 h ahead | 5 h |
Rosario never changes its clocks, but many of these cities do. Where the January and July columns disagree, the gap shifts when the other city moves to or from daylight saving time.
Shared office hours is the part of a 9 AM to 5 PM local working day that both cities have in common. Weekends are not taken into account.
Daylight in Rosario
Today
| Sunrise | --:-- |
|---|---|
| Sunset | --:-- |
| Day length | -- |
| Solar noon | --:-- |
Rosario is in the southern hemisphere, so the longest day comes in December (14 hours 20 minutes) and the shortest in June (9 hours 59 minutes). The latest sunset, at 8:15 PM, falls on January 7.
Daylight through the year in Rosario
| Date | Sunrise | Sunset | Day length | |
|---|---|---|---|---|
| March equinox | March 20 | 7:06 AM | 7:14 PM | 12 h 8 min |
| June solstice | June 21 | 8:05 AM | 6:04 PM | 9 h 59 min |
| September equinox | September 22 | 6:52 AM | 6:59 PM | 12 h 7 min |
| December solstice | December 21 | 5:51 AM | 8:11 PM | 14 h 20 min |
When the sun is highest in Rosario
The clock in Rosario runs ahead of the sun. Solar noon, the moment the sun is highest, comes at about 1:05 PM on standard time. That is why sunrise and sunset both come late here.
Cities near Rosario
Every city below shares Rosario’s clock.
| City | Distance | Time now | Difference |
|---|---|---|---|
| San Nicolás de los Arroyos | 59 km (36 mi) | --:-- | Same time |
| Paraná | 135 km (84 mi) | --:-- | Same time |
| Santa Fe | 144 km (90 mi) | --:-- | Same time |
| Jose C. Paz | 246 km (153 mi) | --:-- | Same time |
| Merlo | 260 km (162 mi) | --:-- | Same time |
| Gregorio de Laferrere | 276 km (172 mi) | --:-- | Same time |
| Buenos Aires | 279 km (174 mi) | --:-- | Same time |
| Ezeiza | 288 km (179 mi) | --:-- | Same time |
Same time now, different rules
These places read the same time as Rosario today but follow different rules, so they can drift apart when clocks change.
More cities in Argentina
All time zones and cities in Argentina
Tools for time in Rosario
- Convert a time to or from Rosario: pick a date and time and see it in every city on your list.
- Add Rosario to your world clock to keep it next to your own time.
- Find a meeting time that falls inside office hours in Rosario and the other cities you work with.
- Open a full-screen clock for your own time zone.
Frequently asked questions
What time zone is Rosario in?
Rosario uses the America/Argentina/Cordoba time zone, which is UTC−3 all year.
Does Rosario use daylight saving time?
Not any more. Rosario last changed its clocks for daylight saving time in 2009 and now stays on UTC−3 all year.
What is the time difference between Rosario and London?
Rosario is 3 hours behind London in January and 4 hours behind London in July, because London moves its clocks for daylight saving time and Rosario does not.
Is Rosario on the same time as Buenos Aires?
Yes. Rosario and Buenos Aires both use UTC−3 right now.
How long is the longest day in Rosario?
About 14 hours 20 minutes, around the December solstice. The shortest day, around the June solstice, has about 9 hours 59 minutes of daylight.
Why is the sun not highest at noon in Rosario?
Clock time follows the time zone, not the sun. Rosario lies west of the line its offset is based on, so solar noon comes at about 1:05 PM on standard time.
Time zone rules: IANA tz database, version 2026e. Place names and coordinates: GeoNames. Sunrise and sunset are calculated from the coordinates and can differ by a minute or two from local almanacs.