# A time zone calculator in plain words

Every example was run through Ratio 0.6.1 on 15 October 2026. Results with a weekday were on that Thursday.

Type a time and a city, then “in” and another city. Ratio knows the time zones and their daylight saving rules, and tells you the day too when the answer lands on another one.

## From one city to another

| 15:00 London in Tokyo | Thu 23:00 |
| --- | --- |
| 9am San Francisco in London | Thu 17:00 |
| 17:30 Berlin in New York | Thu 11:30 EDT |
| 9:00 Paris in Sydney | Thu 18:00 |
| 8pm EST in CET | Fri 02:00 |

## What time is it there?

A time without a city is your own: “3pm in Tokyo” converts 3pm where you are.

| now in New York | Thu 14:39 EDT |
| --- | --- |
| now in unix | 1792089588 |

## Countdowns and dates

Start a line with `until` and it counts down, live, for as long as the sheet is open.

| until Christmas | 70 days 3 h 20 min |
| --- | --- |
| days until christmas | 71 days |
| 14 oct 2027 - 1 oct 2027 | 13 days |
| today + 2 weeks | Thu, 29 Oct 2026 |

See every form in the [syntax reference](https://useratio.app/docs#dates).

Ratio runs on [Mac](https://useratio.app/), [Windows](https://useratio.app/notepad-calculator-windows) and [Linux](https://useratio.app/notepad-calculator-linux) with the same engine, so every example here gives the same answer on all three.

[Try Ratio free for 7 days](https://useratio.app/download) · $9.99 once, updates included

## Questions

**How do I convert time zones on a Mac or PC?** In Ratio, type “15:00 London in Tokyo”. The answer appears beside the line, with the weekday when it changes.

**Does it handle daylight saving time?** Yes. Ratio uses the standard time zone database, so summer and winter time are applied for the date you ask about.

**Can I use time zone abbreviations?** Yes: “8pm EST in CET” works, as do city names.

Source: https://useratio.app/time-zone-calculator