Add Time Calculator

Add Hours, Minutes, or Days to Any Time

Need to figure out what time it will be 3 hours and 45 minutes from now? Or maybe you’re juggling multiple time zones and just want to see what next Wednesday at 2 PM in New York looks like in your calendar. This time-addition calculator makes those questions a whole lot easier to answer. It lets you start with any date, time, and time zone—then add exactly the amount of time you want—and gives you the result in seconds.

Start with a time, end with the answer

The calculator centers around a simple idea: pick a start time and date, add a specific amount of time (whether that’s days, hours, minutes, or seconds), and see what the result is. It handles all the daylight saving rules and time zone conversions for you, so you’re not stuck second-guessing whether it’s EST or EDT—or what time it will be in Tokyo when your meeting wraps up in Berlin.

Why you might reach for this calculator

• You're scheduling international calls and need to know when something ends in local time.
• You're trying to figure out deadlines based on work hours or task durations.
• You want to convert from one time zone to another without counting on your fingers.
• You just like Tools that save you mental math.

Whether it’s for work, travel, or pure curiosity, this tool gets you the exact answer without the hassle.

How to use it

1. Pick your starting time

In the first section labeled Start Time, choose the time, date, and time zone. You can enter a past or future date—whatever you need.

2. Enter the time you want to add

Under Time to Add, you’ll find boxes for days, hours, minutes, and seconds. You can fill in just one field (like 3 hours), or a mix (like 1 day, 4 minutes, and 15 seconds). Any combination works.

3. See the result right away

Once your fields are filled in, the result shows up in the Result section. You’ll see:

• The new date and time
• The ISO 8601 format (great if you’re pasting into a system or tool)
• A readable version in your selected time zone
• A summary of how much time was added

You don’t even need to hit a “submit” button—updates happen as you type.

Details that make it more than basic

Live current time

There’s a little display showing the current time so you can easily compare or reference the now.

12-hour or 24-hour time format

If you prefer AM/PM or military time, just hit the Time Format toggle. It flips the current time display and the output format accordingly.

Handles daylight saving changes

Some cities switch between standard time and daylight time. The calculator handles those shifts based on the date you select—no guesswork needed.

Time zones preloaded

You can choose from a solid list of major global time zones, from Sydney to London to Chicago. The result always sticks to the same zone you started with, so you stay consistent.

What if your inputs feel off?

If you forget to fill in the start time or date, the calculator gives you a nudge to enter them. Also, if you put in weird combinations—like 80 minutes or -1 days—it quietly adjusts and avoids crashing.

It’s also helpful to know the calculator resets the output each time you change something. That means you can experiment with different durations and immediately see what they do.

One less thing to figure out manually

Time math is one of those things that’s easy to mess up, especially across zones or when you're juggling schedules. This calculator takes that off your plate. Plug in your time, add what you need, and move on with your day knowing the numbers are right.