A time zone calculator in plain words
Every example was run through Ratio 0.6.1 on . Results with a weekday were on that Thursday.
Type a time and a city, then “in” another city. Ratio knows the time zones and daylight saving rules, and shows the day too when the answer lands on another one.
Convert a time
| 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 Mac's own time: “3pm in Tokyo” converts 3pm where you are.
| now in New York | Thu 14:39 EDT |
| now in unix | 1792089588 |
Countdowns and dates
Lines that start with until tick down live while 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.
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Questions
How do I convert time zones on a Mac? 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 macOS's time zone data, 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.