Three operating modes. The first is the difference between two dates and times without considering the timezone. The second is the same, but each date can be in its own timezone: the calculator will account for the real difference between the moments in time. The third is conversion: enter a date and time in one timezone and get the corresponding time in any other. Daylight saving time (DST) transitions are handled automatically.
Here Date Calculator, Time Calculator, Age Calculator
Calculator
When does this come in handy?
- Online meetings and calls. A colleague in London says "let's meet at 15:00" — but 15:00 in which timezone? Enter both dates with their timezones and instantly see if it's the exact same moment or if there is a difference.
- Flights and travel. A flight departs from Kyiv at 06:30 Kyiv time and lands in Dubai at 12:45 local time — how long was the flight really? By factoring in timezones, the calculator gives the exact answer.
- Working with international deadlines. A deadline is "23:59 EST" — what time is that in Kyiv? The conversion mode provides an instant answer.
- Remote work and distributed teams. If your colleagues are scattered across different countries, it's easy to check how much time has passed between events or what time your deadline falls in their local time.
⚠️ Daylight Saving Time (DST) transitions are handled automatically based on the IANA Time Zone Database — the exact same data used by operating systems and web browsers.
Frequently Asked Questions (FAQ)
Why do Kyiv 12:00 and New York 05:00 show a difference of 0?
Because they represent the exact same moment in time — in the summer, there is exactly a 7-hour difference between Kyiv (UTC+3) and New York (UTC-4), and 12:00 − 7 hrs = 05:00. The calculator compares real moments in time, not just the numbers on the clock.
What is the difference between the first and second modes?
In the first mode, the calculator simply calculates the difference between the two date/time inputs. In the second mode, it accounts for the fact that 12:00 in Kyiv and 12:00 in London are different moments in time.
Are daylight saving time transitions accounted for?
Yes, automatically. For example, Europe/London is UTC+0 in the winter and UTC+1 in the summer. You don't need to remember when the transitions occur.
What is the difference between UTC and GMT?
For practical calculation purposes, there is none. UTC is the modern standard, while GMT is the historical name. They are equivalent in the timezone list.