The best time zone calculator for iPhone


App Store $0.99

Zones is our favorite time zone calculator app for iPhone because of its simple UI, minimal functionality, and ability to look at specific future times in many time zones.

We spent the past several weeks looking at over two dozen time zone iOS apps to determine which one makes dealing with multiple time zones easy and simple. If you have colleagues, family, or friends in other parts of the world, you know how much of a headache converting time zones can be — especially if you’re dealing with more than just two zones.

Use Case

I frequently have to set up meetings between groups of people that span several time zones — sometimes up to 5 or 6 different zones across the world. I rely on my iPhone to convert time zones while I’m trying to schedule a meeting so everyone can attend. I quickly realized that using a world clock that only shows current time wasn’t very helpful for scheduling meetings. In some time zones, you’re not even on the same day of the week.

Macs and iOS devices have world clocks built into the OS, but they can only show you the current time. For scheduling meetings in the future, it’s imperative that the app can show you those future times across all time zones.

I needed an app that could allow me to set future times in different time zones (not just my own local time) so that I could find a great time for us all to meet without causing any confusion with the group. And, I wanted to be simple and fast. This was the basis for creating our criteria for this app category.


Our criteria for a time zone converter are simple, but also make it easy to remove many from the list. In case you haven’t looked, world clocks is a very congested genre in the App Store. We needed specific criteria to narrow down the test group.

  • Easy to use. Converting time zones is already difficult, so an ideal app for this job needs to be easy to operate. Some apps try to offer too much functionality or make it difficult to discover and learn critical features. Our ideal app makes the process of exploring different times in several time zones effortless.
  • Limited functionality. We’re not looking for a Swiss Army Knife of time zones, world weather, alarms, lists, and more. We want an app that does one thing well: show us several time zones and let us look at future times across all those zones.
  • Ability to look at future times. Like I mentioned earlier, just being able to see the current time across many time zones isn’t enough. We need the ability to set future times starting from any time zone.
  • Pleasant design. This usually goes without saying, but we want something that’s kept up-to-date with current iOS design trends, and looks great in the process.
  • Steady updates. Similar to the point above, we want an app that we can depend on when new iOS updates come out. We don’t want to fall in love with an app only to find that it starts stagnating and developing bugs over time that aren’t fixed.
  • Today widget. For those times when you want to quickly glance at several current times, a Today widget is crucial. On iOS, Apple doesn’t offer a widget for this, so our pick needs to have one.
  • Price. Price isn’t a huge factor in this category of apps, but we do appreciate a simple pricing scheme and the ability to turn off ads. Also, we love supporting the developers that make these tools we come to depend on over time.

Our pick: Zones

Zones hero

After several weeks of trying out several different apps for converting time zones, we landed on Zones because it looks great, is easy to use, and makes the process of converting time zones effortless.

First use

The first time you use a time zone converter can be overwhelming because you have to add several different zones, the app might have a long default list to begin with, and you have to figure out what the baseline zone is.

Zones is one of the few apps that uses your location to determine your local time. It only uses your location data while you’re using the app, and from what I’ve seen, it uses this privilege very infrequently.

When first launching the app, there aren’t any time zones displayed except for your current time. To add more zones, just tap the plus button in the bottom right corner.

First start screen, no time zones

Using the app

To add a time zone, just search for the city and tap it once it comes up. Zones does this process extremely quickly. Other contenders were a bit slow with the process of adding more time zones. Also, another key factor here was the information included while searching for a city. It displays city, country, and time zone name. You can search by typing in the name of the city, or you can scroll through the entire list. I wouldn’t recommend the latter.

List of time zones

From what I can tell, there isn’t a limit to the number of time zones you can add to the main view. But, in the event you need to remove a zone from the list, just swipe left and tap Delete.

If you need to do more editing to your list, there’s a convenient edit button that allows you to bulk delete and reorder your list.

Edit screen

One major complaint I have with Zones is that it doesn’t automatically sort your time zones. If you want the zones to go in ascending order from your local time, you have to order them manually. Surprisingly, only a small number of apps we tested actually sorted time zones automatically, but bhis is one thing that I’d love to see in a future update.

Once you’ve set up your time zones, you have a simple, easy-on-the-eyes view of the current times. Now, what about changing those times to points in the future? Easy.

To change the time on any time zone, just tap it. A small date and time selector pops up for you to dial in the time you want to view. Tap Done, and all the zones update instantly. This was a big deal to me, as many apps make this process difficult or bury the feature under several additional taps. Zones keeps this process at the very top, which is fantastic.

Zones time selector

When you’re done looking at future times, just tap Reset Time at the top of the screen to return to your current time. Again, this wasn’t as straight-forward and obvious in other apps, so I appreciate the simplicity here.

One other feature that appears when you tap the hamburger button in the bottom left is a settings screen. This is a bit misleading as there aren’t any settings to change — only a couple of links to either send feedback to the developer or write a review in the App Store. In an app of this category, I don’t expect any settings that I can change, but I do think this button graphic is a bit misleading.


The design of the app is clean, calm, and easy to take in. There’s a lot of information being displayed in this app, but it doesn’t feel overwhelming, and it’s also very fast when making changes. I’ve used this app to figure out meeting schedules from California, Missouri, Chile, Switzerland, New Delhi, and Perth. It was an easy process and I actually found it delightful because of all the not-so-great experiences I’ve had in the past with this task. Instead of a chore, it’s now an easy task that takes seconds instead of minutes.

Today Widget

Zones features a basic Today widget that is helpful for quick glances at current times in the zones you’ve set up. You can’t look at future times from the widget, but I’d argue that this isn’t a good use case anyway. Several other contenders offered this functionality in some way, but it was a poor experience every time.

Zones today widget

The Zones widget offers the same information in the Today view as the main app. When pulling down the Today view, the time zone data populates instantly. Other apps we tried took a couple of seconds to retrieve data before populating in the widget.

Overall, the widget is a great addition for quickly glancing at time zones across the world.


Zones costs $0.99, which is comparable to other apps in the same category. We appreciate the simple pricing model, as many other apps chose to include ads and confusing IAP models. The price is extremely fair (maybe a bit low) and very competitive. It also gives us confidence that it will be around for quite a while.

Zones hasn’t been updated since the end of 2014, but that also isn’t uncommon for this category of apps. The most important thing to us is that bugs get fixed and the app keeps up with iOS versions, and Zones does that.

Runners up


TimeZoner is another great app that does one thing well. It has the same features as Zones, but it requires an extra tap to change times on a time zone since you have to select a time zone first. TimeZoner also lacks a Today widget, which is one of our requirements for quickly glancing at current times.

TimeZoner main screen

While we prefer Zones, TimeZoner is an equally well-built, fantastic app. You can’t go wrong with either one.

TimeZoner is either free (with ads) or $3.99 for the full version.


TimeSkip, like Zones and TimeZoner, offers the same functionality for viewing and changing time zones. The main down-side with TimeSkip, however, is the aesthetic design. It’s bare and doesn’t have visual cues to lead you through the process of adding time zones, changing the times in each one, etc.

TimeSkip main screen

One advantage it does have over our pick, though, is the ability to change the time (by 30-minute increments) in the Today widget. This is a fantastic bonus over Zones, and if you need this ability in the Today view, I highly recommend TimeSkip.

TimeSkip is a free app with no ads or IAPs.

Same positives as Zones, but not as well-designed. Very basic.

Time Zones +

Time Zones + was my personal favorite earlier this year. It offers the functionality we expect based on our criteria, including a nice design and a Today widget, but it requires several more taps to operate than Zones and TimeZoner. It’s a nice app, but it’s not as easy or well-designed as others out there.

Time Zones + main screen

Time Zones + is free in the App Store, but a $4.99 IAP turns off ads and allows unlimited time zones.


Circa employs an interesting and unique visual design and interaction, but requires more time to use. Basically, time is represented visually on a 24 hour clock dial. As you rotate the needle, the times in the lower portion of the app update accordingly. This is fun to use, but ultimately not as easy and straight-forward as others. Another downside is that you can only view 3 time zones at a time. Circa also lacks a Today view widget, but, strangely enough, it is the only app that we tested that features a watchOS app.

Circa main screen

Circa is $0.99 in the App Store.

24 Hours

Similar to Circa, 24 Hours uses the same visual design of placing time zone charts against a clock dial to represent different time zones. Like Circa, this is a fun and visual way to look at time zones, especially how they interact with each other. But, at the end of the day, we prefer the design of Circa over 24 Hours.

24 Hours main screen

24 Hours is $1.99 in the App Store.


Globo is unique in this category, as it offers much more than time zone conversions. It also features latitude/longitude information, maps, weather, and time zone-specific alarms for each time zone you add.

Globo main screen

This would be a major contender with our picks if it was easier to figure out how to use the time zone converter. The time zone information is buried in the 3rd tab of each time zone, and it took us longer than it should have to discover how to set a time zone as the primary by which all others would relate.

All in all, Globo looks great and offers an abundance of good information, but it doesn’t quite fit our criteria for this pick. Globo is $0.99 in the App Store.

World Time Buddy

World Time Buddy is one of the more well-known time zone converter apps, but the design and functionality just didn’t compete with our pick. Each time zone is represented by a row of blocks that represent hours. These rows line up by each time zone, and all you have to do to change the time is swipe left and right to increase or decrease the time. It works really well, but the overall aesthetic feels dated.

World Time Buddy main screen

Also, one of the main points of this app is setting up meeting invites that you can send to people straight from the app. Since this feature is so important to the app, you can’t get away from it. So, for someone who just wants to calculate different time zones, this feature can get in the way and cause some frustration. Still, it’s well-built and does a great job at what it was designed to do.

World Time Buddy is free in the App Store with a $2.99 IAP to remove ads and allow unlimited time zones.

Honorable Mention: Widget Only apps

There were a couple of great options that only offer Today widgets. If that’s what you’re after, we recommend either of these two.


Klok is well-designed, both in the app and when viewing it in the Today screen. Also, you can change the time directly in the widget to look at future times, but we found this to be clunky due to the tiny UI controls available.

Klok is free in the App Store.

World Time

World Time is a simple widget that does just what the name implies: shows you the time around the world. Like Klok, you set up your time zones in the app, and they are displayed on the Today screen.

World Time is $0.99 in the App Store.

Honorable Mention: iOS’ built-in Clock app

An incredibly useful clock app is delivered as part of iOS, and it even features an extremely useful time zone section in the World Clock tab. If you only need to look at the current time in several time zones, you really can’t go wrong with this one. It doesn’t have the features of our pick, like the ability to look at future times or the option of a Today view widget, but it’s the best at what it does. Even better, you can use this same functionality in OS X with the Today pane.


Zones is our favorite time zone calculator because of its simple, intuitive design and competitive price. And, it offers additional perks in the way of a Today widget, and is extremely easy to understand and use from the beginning.



Zones is our favorite time zone calculator app for iPhone because of its simple UI, limited functionality, and ability to look at specific future times in many time zones.
App Store $0.99