Android Code Snippet [B4X] Convert milliseconds to string

This code converts milliseconds to hours, minutes and seconds:

Sub ConvertMillisecondsToString(t As Long) As String
   Dim hours, minutes, seconds As Int
   hours = t / DateTime.TicksPerHour
   minutes = (t Mod DateTime.TicksPerHour) / DateTime.TicksPerMinute
   seconds = (t Mod DateTime.TicksPerMinute) / DateTime.TicksPerSecond
   Return $"$1.0{hours}:$2.0{minutes}:$2.0{seconds}"$
End Sub

It is somewhat similar to DateTime.Time however DateTime.Time works with ticks that represent a specific time instance and is therefore affected by the time zone.

 

[LucaMs]

With milliseconds:

Private Sub ConvertTicksToTimeString(t As Long) As String
    Dim Hours, Minutes, Seconds, Milliseconds As Int

    Hours = t / DateTime.TicksPerHour
    Minutes = (t Mod DateTime.TicksPerHour) / DateTime.TicksPerMinute
    Seconds = (t Mod DateTime.TicksPerMinute) / DateTime.TicksPerSecond
    Milliseconds = t Mod 1000
    
    Return $"$2.0{Hours}:$2.0{Minutes}:$2.0{Seconds}:$2.0{Milliseconds}"$
End Sub

Return $"$1.0{hours}:$2.0{minutes}:$2.0{seconds}"$

Why 1.0 for hours?!

 

[aeric]

Why 1.0 for hours?!

Hours can be at least 1 integer and I think milliseconds should show in 3 digit, e.g 1:02:59:003

Return $"$2.0{Hours}:$2.0{Minutes}:$2.0{Seconds}:$3.0{Milliseconds}"$

 

[LucaMs]

Yes, "at least".

 

[LucaMs]

Log(ConvertMillisecondsToString(DateTime.Now))

Log:
484,336:08:33

Dim Ticks As Long
Ticks = DateTime.TimeParse("11:12:13")
Log(ConvertMillisecondsToString(Ticks))

Log:
484,329:12:13

 

[Erel]

The purpose of this code is to convert a duration value to string. Time instance is not a duration value. The result is more or less meaningless.

 

[LucaMs]

The purpose of this code is to convert a duration value to string. Time instance is not a duration value. The result is more or less meaningless.

I don't understand what you mean by "duration" and "Time instance" (as if Time were a class).
I thought DateTime.TimeParse (my second test) returned the ticks of the time (time or duration can be the same thing).

 

[Erel]

January 2nd 2025 14:30:00 - time instance. Use DateTime.Time or DateTime.Date to convert the time instance value to a string. It depends on the timezone and DST.

34 minutes and 12 seconds - duration. Use this code to convert the duration to a string. It doesn't depend on anything.

 

[LucaMs]

It depends on the timezone and DST.

This is the problem, in fact you wrote:

It is somewhat similar to DateTime.Time however DateTime.Time works with ticks that represent a specific time instance and is therefore affected by the time zone.

Despite the help of ChatGPT, I still haven't managed to get two functions to handle a duration in the format: "HH:mm:ss:SSS" both ways, from string to ticks and vice versa.

However, this is most likely not the right place for this question.

 

[LucaMs]

Despite the help of ChatGPT, I still haven't managed to get two functions to handle a duration in the format: "HH:mm:ss:SSS" both ways, from string to ticks and vice versa.

However, this is most likely not the right place for this question.

Done