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Session time is incorrect due to Time Zone change.

See original GitHub issue

Overview (Required)

The reproduction procedure is as follows.

  1. Visit Settings app. 1-1) Data & time > Set Time zone to London. (GMT+00:00) 1-2) Perform CLEAR DATA of droidkaigi2018 app.
  2. Launch droidkaigi2018 app. (Sessions will be displayed soon.)
  3. Finish app. (Back button)
  4. Visit Settings app. 4-1) Data & time > Set Time zone to Tokyo. (GMT+09:00)
  5. Launch droidkaigi2018 app. (The time of the displayed session is incorrect.)


As an impression that I read the code, the following code has doubts.


private val FORMATTER: DateTimeFormatter =
fun parseDateString(dateString: String?): LocalDateTime =
        LocalDateTime.parse(dateString, FORMATTER)

I guess that the time obtained from the server is based on Japan time. However, the application is parsing according to current Time Zone set for the terminal?


Issue Analytics

  • State:closed
  • Created 6 years ago
  • Reactions:2
  • Comments:10 (10 by maintainers)

github_iconTop GitHub Comments

nukka123commented, Jan 20, 2018


Ok. I send PR! #371

nukka123commented, Jan 20, 2018


I will introduce the code that I was verifying locally.

It is necessary to assume that the time expressed by LocalDateTime is JST.

fun LocalDateTime.toUnixMills(): Long = atZone(ZoneId.of("JST", ZoneId.SHORT_IDS))
    fun fromTimestamp(value: Long?): LocalDateTime? {
        if (value == null) {
            return null
        return LocalDateTime.ofInstant(
                Instant.ofEpochSecond(value), ZoneId.of("JST", ZoneId.SHORT_IDS))

Also, we should write javadoc about the time zone assumed by LocalDateTime.

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