Timezone Converter — Cities, IANA Zones & UTC Offsets

Introduction

Pick a source IANA time zone and a civil date-time. The same instant is shown in UTC and any cities you add. Offsets and a six-month DST shift hint are computed locally — nothing is uploaded.

Step-by-step

1. Choose the source zone and the local date-time there
2. Add destination cities from the IANA list
3. Copy the table or the UTC instant

Worked example

Midnight 1 January 2020 in UTC is 05:30 the same morning in Asia/Kolkata (offset +05:30). The Unix seconds for that instant are 1577836800.

Use cases

• Schedule a call across New York, London, and Kolkata
• Check whether a meeting falls during a DST change
• Copy ISO-8601 strings with the correct offset

Frequently asked questions