Skip to content
Runs privately in your browser

Free Online Timezone Converter

Convert a wall-clock time between IANA zones and flag DST ambiguities.

Your input stays on this device. Processing is bounded; regex runs in a worker with a two-second timeout.

Result



How to use Timezone Converter
Convert a wall-clock time between IANA zones and flag DST ambiguities. Use IANA zone names. Nonexistent spring-forward times are rejected. Repeated fall-back times require an earlier/later choice; reject is the default.
  1. Set Local time without offset.
  2. Set Source IANA timezone.
  3. Set Destination IANA timezone.
  4. Set Repeated DST time.
  5. Run the tool, review the result and its stated limitations, then copy or download if needed.
Example & practical use
Convert a wall-clock time between IANA zones and flag DST ambiguities. The example below demonstrates Local time without offset; Source IANA timezone; Destination IANA timezone; Repeated DST time.
Example input:
{
  "local": "2024-01-01T12:00:00",
  "fromZone": "America/New_York",
  "toZone": "Asia/Karachi",
  "ambiguity": "reject"
}
Expected result (relevant fields):
{
  "utc": "2024-01-01T17:00:00.000Z",
  "local": "2024-01-01T22:00:00"
}
Features & result limitations
Use IANA zone names. Nonexistent spring-forward times are rejected. Repeated fall-back times require an earlier/later choice; reject is the default.
Frequently asked questions
What inputs does Timezone Converter accept?
Local time without offset; Source IANA timezone; Destination IANA timezone; Repeated DST time
How should I interpret the Timezone Converter result?
Use IANA zone names. Nonexistent spring-forward times are rejected. Repeated fall-back times require an earlier/later choice; reject is the default.
Where does Timezone Converter process my data?
Inputs are processed locally in your browser. Submitted text is not sent to external services. A successful-run event increments an aggregate tool counter without your input.