Kotlin .offsetAt()

The .offsetAt() method is used to find the offset from UTC(Coordinated Universal time) for a specific time zone at a specified instant in physical time.

Syntax

fun TimeZone.offsetAt(instant: Instant): UtcOffset

• Instant: A moment in time.
• UtcOffset: An offset from UTC (Coordinated Universal Time).
• TimeZone: Provides a conversion between Instant and LocalDateTime values using a collection of rules.

Example

The example given below provides the offset for Asia/Kolkata time zone at a specified instant.

import kotlinx.datetime.Instant
import kotlinx.datetime.TimeZone

fun main() {
  val instant = Instant.parse("2023-11-07T12:00:00Z")
  val timeZone = TimeZone.of("Asia/Kolkata")

  val offset = timeZone.offsetAt(instant)

  println("At $instant, the offset from UTC in ${timeZone.id} is $offset.")
}

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Note: The string 2023-11-07T12:00:00Z specifies date and time of November 7, 2023, at 12:00:00 UTC. The T separates the date and time components, and Z indicates that the time is in UTC.

The above example will result in the following output:

At 2023-11-07T12:00:00Z, the offset from UTC in Asia/Kolkata is +05:30.

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