I have a Date Fri Jun 28 10:00:01 GMT+01:00 2024 which I want to convert to Epoch milis to send to the backend.

I have tried the following

fun Dates.toEpochMillis(timeZoneId: ZoneId): Long {
    val one = Instant.ofEpochMilli(time).toEpochMilli() // 1719565201000
    val three = secsToMillis(this.toLocalDateTime(timeZoneId).utcEpochSecs) // 1719568801000
    return one
}

fun Dates.toLocalDateTime(timeZoneId: ZoneId): LocalDateTime {
    return Instant.ofEpochMilli(time).atZone(timeZoneId).toLocalDateTime()
}

fun secsToMillis(timeInSecs: Long): Long {
    return timeInSecs * 1000
}

which of the above is correct, or if you suggest any other way of doing this please?

Note: I am not using this value to display but to send it to backend.

thanks
R