How to show progress in Date/time range in progress/seek bar android

Question

I need to show in progress bar time lapse. I have start date/time and end date/time, so between start/date/time and end/date/time progress should be showed. Please help who had experience with this.

start========(current time)=======end 

this is how it should looks like:

Answer 1

You can use this simple small function:

fun progress(start: LocalDateTime,
             end: LocalDateTime,
             now: LocalDateTime = LocalDateTime.now()): Double = when {
    now <= start -> 0.0
    now >= end -> 1.0
    else -> start.until(now, ChronoUnit.SECONDS) /
            start.until(end, ChronoUnit.SECONDS).toDouble()
}

It has 3 different cases:

1. now is before or equal to start then the progress is 0
2. now is after or equal to end then the progress is 1
3. calculate (now - start) / (end - start) which gives a fraction in the range 0-1

You can then take that fraction and multiply it by 100 to get the percentage:

val progress = progress(start, end)
val percentage = (progress * 100).roundToInt()