Time Zone Converter
Convert a time between time zones worldwide, see the hour difference, and plan a meeting across 2 to 5 zones. Runs in your browser with IANA data, nothing leaves your device.
Difference between zones: 2 שעות 30 דקות אחורה
Dates and time zones stay in your browser and are not uploaded. The tool uses the browser IANA data (through Intl.DateTimeFormat) and so handles daylight saving automatically. It is a daily-planning helper only. For sensitive cases like scheduling a flight, a legal deadline, a medical appointment, or a payment, check the relevant authoritative source.
The time zone converter is a free browser tool for converting times between world time zones and for planning meetings across teams in different cities. Two modes: (1) single converter, enter a date and time in a source zone and get the time and date in a target zone, including the hour difference and automatic daylight saving handling. (2) meeting planner, pick 2 to 5 zones and see a 24-hour table with the hours that are comfortable in all zones at once highlighted (default 09:00 to 18:00). The tool uses the browser IANA data (through Intl.DateTimeFormat and zone names like Asia/Jerusalem, America/New_York, Asia/Kolkata, Europe/Berlin). It does not use fixed offset tables. Daylight saving is handled automatically for New York (EST/EDT), Los Angeles (PST/PDT), Berlin (CET/CEST), London (GMT/BST), and others. Abbreviations you type (EST, IST, CET and so on) are mapped to a matching IANA zone, and when an abbreviation is ambiguous (especially IST) the tool shows the options (India, Israel, Ireland) and asks you to choose. Everything happens in your browser: dates, zones, and results are never uploaded or stored. The tool is a daily-planning helper. It is not a substitute for the authoritative source for flight times, legal deadlines, medication times, payroll calculations, or medical scheduling. Time zone rules can change, and the tool depends on how up to date your browser system data is. Last updated: May 2026.
How to use this tool
- 01Choose a modeThe "converter" mode suits a single conversion of a specific time. The "meeting planner" mode suits comparing several zones side by side across 24 hours, with the comfortable-hours window highlighted.
- 02Pick time zonesChoose from a list of common cities (Israel, UTC, New York, Chicago, Los Angeles, London, Berlin, Paris, India, Dubai, Singapore, Tokyo, Shanghai, Sydney, Cairo, São Paulo, Dublin). Or type an abbreviation like EST, PST, CET, and the tool suggests the matching zone.
- 03Handle the IST ambiguityIf you type IST, the tool asks which IST: India (Asia/Kolkata, UTC+5:30), Israel (Asia/Jerusalem, shifts with daylight saving), or Ireland (Europe/Dublin, UTC+1 in summer). Similarly CST can be Chicago (UTC-6) or Shanghai (UTC+8). Pick the one you mean.
- 04Enter a date and time (converter mode)A date in yyyy-mm-dd format and a time in 24-hour HH:MM format. The result also offers a 12-hour view. The time is the local time in the source zone you picked.
- 05Read the result (converter mode)You get the matching time in the target zone with a full date, the hour difference between the zones, and the current offset of each zone (for example UTC+03:00 for Israel in summer).
- 06Plan a meeting (planner mode)Add 2 to 5 zones. The tool shows a 24-hour grid with the local time in each zone. Rows where all zones fall in the 09:00-18:00 window (adjustable) are highlighted, making it easy to pick a time that works for everyone.
When is this useful?
- Scheduling a meeting with a team in IndiaIndia is at a fixed UTC+5:30 (no daylight saving). The tool shows the exact difference for any given day, which changes through the year for zones that do observe daylight saving.
- A call with a client in New YorkNew York is UTC-5 in winter (EST) and UTC-4 in summer (EDT). The difference changes through the year, and the tool handles it automatically based on the reading date.
- Planning a global workdayAn office with teams in Los Angeles, Berlin, and another city. In meeting planner mode, comparing the zones shows which hour falls in 09:00-18:00 for all of them at once.
- Figuring out which IST a post meansA US technical article that writes "9:00 IST" almost always means India. A post written locally may mean a different IST. The tool asks you which IST you mean.
- Planning a video call with family abroadFamily in Los Angeles, Sydney, and another city. In meeting planner mode, an evening window (for example 17:00-22:00) is marked as comfortable for everyone.
Examples
- 09:00 in Jerusalem on June 15, 2026, to IndiaIsrael in summer = UTC+3 (IDT). India is UTC+5:30. 09:00 in Israel = 11:30 in India on the same date. Difference: 2:30 ahead.
- 14:00 in New York on June 15, to IsraelNew York in summer = UTC-4 (EDT). Israel in summer = UTC+3 (IDT). 14:00 in New York = 21:00 in Israel on the same date. Difference: 7 hours.
- 14:00 in New York on December 15, to IsraelNew York in winter = UTC-5 (EST). Israel in winter = UTC+2. 14:00 in New York = 21:00 in Israel. Difference: 7 hours (same as summer here, since both zones are in winter).
- UTC 00:00 on June 15, to IsraelUTC 00:00 = 03:00 in Israel in summer (IDT, UTC+3). The date rolls to June 15 at 03:00.
- Meeting planner: New York, Berlin, IsraelIn a 09:00-18:00 window, 16:00-18:00 in Israel is 15:00-17:00 in Berlin and 09:00-11:00 in New York. Those rows are highlighted as comfortable for everyone.
Tips for a better result
- The tool uses the browser IANA dataThrough JavaScript's Intl.DateTimeFormat, the tool gets the standard time zone names (for example Asia/Jerusalem, America/New_York) and the up-to-date rules from the browser, including daylight saving. There is no need to manually update the tool when daylight saving rules change; the browser gets the update.
- Ambiguous time abbreviationsIST = India OR Israel OR Ireland. CST = Chicago OR Shanghai OR a few others. CET = Berlin/Paris/Rome/Madrid (all the same zone). The tool shows the options; pick the one you mean.
- Daylight saving changes between yearsDifferent countries adopt (or drop) daylight saving. For example, most of Mexico dropped daylight saving in 2022. The tool depends on the browser system data; if the system is up to date, so is the tool.
- Your data stays with youThe dates, times, zones you pick, and all results are not saved to localStorage, not uploaded, and not sent to analytics. Refreshing the page resets everything.
How the calculation works
The tool uses the standard JavaScript API: Intl.DateTimeFormat with a timeZone parameter of a full IANA name (for example Asia/Jerusalem, America/New_York). To convert a time from zone A to zone B: the tool first builds the local time in zone A, converts it to UTC by comparing the "desired" time to the "observed" time in zone A (two passes to handle daylight saving transitions), then formats the resulting UTC in zone B. This approach automatically handles daylight saving, half-hour offset zones (like India +5:30), and date differences that arise when crossing the meridian.
How abbreviations are handled
An abbreviation is a convenient way to type, not an official name. The tool maps it to a full IANA zone and shows that zone in the result. Examples: EST/EDT/ET to America/New_York; CET/CEST to Europe/Berlin (including Paris, Rome, Madrid); PST/PDT/PT to America/Los_Angeles; GMT to UTC; BST to Europe/London in summer. For IST there is a selection menu: India (Asia/Kolkata), Israel (Asia/Jerusalem), Ireland (Europe/Dublin). For CST there is tension between Chicago and Shanghai; the tool shows both zones.
When the tool is not the right choice
The tool is a daily-planning helper, not an authoritative time source. For scheduling a flight, use the airline schedule and the airport site (those have local times built into the booking, and sometimes unique access rules). For a legal deadline, check the court's definition (official deadlines are computed by the legal source in its official time zone). For a medication schedule, consult a doctor or pharmacist. For payroll calculations on hours that cross midnight, consult an accountant or payroll advisor. For these cases use the authoritative source or the right advisor.
Known limitations
The tool offers a small list of zones (about 17 common cities). Rarer zones can be entered later by typing a full IANA name (for example Pacific/Auckland); that support will arrive in a future version. Daylight saving rules in some countries (especially in Latin America) have changed recently; the tool depends on the browser system data. At the edges of a daylight saving transition (a "double counted hour" / a "skipped hour"), the tool converges to a standard value within 1-2 internal passes. For sensitive day-to-day scheduling, check an official clock or the destination calendar.
Privacy
Everything happens in your browser. The date, time, zones you pick, and the result are not uploaded, not saved to localStorage or IndexedDB, and not sent to analytics. Minimal operational analytics measure general usage only: a page view, a first successful use of the tool, and a copy. No value, zone, or result is ever sent.
Frequently asked questions
What is a time zone converter?
A browser tool that converts a time and date in one time zone to a time and date in another zone, taking daylight saving into account. It also has a meeting planner mode that compares 2 to 5 zones at once.
Which time zones are supported?
A small list of common cities: Israel, UTC, New York, Chicago, Los Angeles, London, Berlin, Paris, India, Dubai, Singapore, Tokyo, Shanghai, Sydney, Cairo, São Paulo, Dublin. Each maps to a standard IANA zone.
How does the tool handle daylight saving?
It uses the browser Intl.DateTimeFormat with a full IANA zone name. The browser knows when each zone applies daylight saving, so the conversion automatically matches the right season for the date you picked.
What is the difference between India IST and Israel IST?
India IST = Asia/Kolkata, a fixed offset of UTC+5:30, no daylight saving. Israel IST = Asia/Jerusalem, moving between UTC+2 in winter and UTC+3 in summer (IDT). Ireland IST = Europe/Dublin in the summer months (UTC+1). The tool asks which IST you mean when you type the abbreviation.
When does CST mean Chicago and when Shanghai?
CST in the US = America/Chicago (UTC-6 winter, UTC-5 summer). CST in China = Asia/Shanghai (UTC+8, no daylight saving). Two completely different zones that start with the same abbreviation. The tool shows both when you type it.
Should I use the tool to schedule a flight?
No. A flight has local times shown in the booking and the airline schedule, and sometimes unique rules around a daylight saving change during the flight. For actual flight scheduling, check the times in the booking and the relevant airport site.
Does the tool send my data anywhere?
No. All conversion happens in your browser. No time zone, date, time, or result is uploaded, stored, or sent to analytics.
How accurate is the tool?
Accurate to the minute, subject to how current the time zone data is in your browser. At daylight saving transitions (a skipped hour, a doubled hour), the tool converges to a standard output. For very sensitive cases (critical medical timing, a legal deadline, payroll over clock-change hours), check the official source.
Will you add a time zone I need?
The current list covers the most common cities. Rarer zones will be added in an update. Even now, as long as the browser has that zone in IANA, the full name could be used in a future advanced editor.
Is the tool free?
Yes. The tool is free, with no signup, no account, and no reasonable usage limit.