Android Question Strange problem with Long Variable

[calloatti]

I have encountered a strange problem while asigning a value to a variable of type long. To reproduce, create a default project and use this code:

Sub Activity_Create(FirstTime As Boolean)
    Activity.LoadLayout("Layout")
    
    Dim ltest As Long
    
    ltest = 2592000000
    
    Log(ltest)

    ltest = 30*24*60*60
    
    Log(ltest)
    
    ltest = ltest * 1000
    
    Log(ltest)
    
    ltest = 30*24*60*60*1000
    
    Log(ltest)
    
End Sub

Now run it and this is the log output:

--------- beginning of main
** Activity (main) Pause, UserClosed = true **
** Service (starter) Destroy (ignored)**
*** Service (starter) Create ***
** Service (starter) Start **
** Activity (main) Create (first time) **
2592000000
2592000
2592000000
-1702967296
** Activity (main) Resume **

The last value is wrong, and I have no idea why this happens. I came across this when processing sqlite records to check their age, so I want records older than 30 days to be marked as stale.

30 days = 30*24*60*60*1000 in milliseconds.

I noticed that 2592000000 = 0000 0000 9A7E C800 in HEX, and -1702967296 = FFFF FFFF 9A7E C800

What am I doing wrong?

 

[Mahares]

If you use ticks, it will work for you:

Dim ltest As Long = 30*DateTime.TicksPerDay
    Log(ltest)   '2592000000

 

[OliverA]

he last value is wrong

As to why see https://www.b4x.com/android/forum/t...-is-negative-and-incorrect.131634/post-831317 and the included links.