commonMain.jetbrains.datalore.base.datetime.tz.TimeZoneMoscow.kt Maven / Gradle / Ivy

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/*
 * Copyright (c) 2019. JetBrains s.r.o.
 * Use of this source code is governed by the MIT license that can be found in the LICENSE file.
 */

package jetbrains.datalore.base.datetime.tz

import jetbrains.datalore.base.datetime.*

internal class TimeZoneMoscow : TimeZone(ID) {
    private val myOldOffset = Duration.HOUR.mul(4)
    private val myNewOffset = Duration.HOUR.mul(3)
    private val myOldTz = TimeZones.offset(null, myOldOffset, TimeZone.UTC)
    private val myNewTz = TimeZones.offset(null, myNewOffset, TimeZone.UTC)

    private val myOffsetChangeTime = DateTime(Date(26, Month.OCTOBER, 2014), Time(2, 0))
    private val myOffsetChangeInstant = myOldTz.toInstant(myOffsetChangeTime)

    override fun toDateTime(instant: Instant): DateTime {
        return if (instant.compareTo(myOffsetChangeInstant) >= 0) myNewTz.toDateTime(instant) else myOldTz.toDateTime(instant)
    }

    override fun toInstant(dateTime: DateTime): Instant {
        return if (dateTime.compareTo(myOffsetChangeTime) >= 0) myNewTz.toInstant(dateTime) else myOldTz.toInstant(dateTime)
    }

    companion object {
        private val ID = "Europe/Moscow"
    }

}