Timezone Calculator

Convert a time between cities/timezones — useful for calls with overseas clients

Converting a time between cities or timezones for scheduling calls with overseas clients requires accounting for more than a fixed hour offset — daylight saving time changes mean the effective offset between two specific locations can shift over the course of the year, which is exactly why a timezone conversion that was correct in one season can become wrong in another.

Why timezone offsets aren't always fixed year-round

Many countries and regions observe daylight saving time, shifting their clocks forward or back by an hour during part of the year — but not every country does this, and the specific dates DST starts and ends vary by country where it is observed. This means the effective time difference between two specific locations can genuinely change over the course of the year: if one location observes DST and the other doesn't, or if both observe DST but on different schedules, the hour offset between them isn't constant across all twelve months, even though it might feel like a fixed number most of the time. Pakistan itself does not currently observe daylight saving time, which means the offset between Pakistan and a DST-observing location shifts specifically during that other location's DST period, not Pakistan's own clock changing.

A worked example

A scheduled call time that was correctly converted between Pakistan and an overseas location during one part of the year can become off by an hour if calculated the same way during a different part of the year when the overseas location's DST status has changed — the Pakistan side of the conversion stays constant, but the other location's seasonal clock shift changes the effective offset between the two.

How this connects to your other date and time calculations

For working with time zones alongside actual date calculations — coordinating a meeting time that also needs to respect working-day conventions, for instance — the Working Days Calculator handles the business-day side of scheduling separately from the pure time-zone conversion this calculator provides.

Common mistakes

Assuming a timezone offset calculated correctly once will remain accurate year-round is a common scheduling mistake, especially for overseas clients in DST-observing regions — always reconfirm the current effective offset for the specific dates involved, rather than reusing a previously-correct offset from a different time of year.