how to convert milliseconds to a human readable date

[kognitio]

Hello together,
I am getting a time-value from a machine in milliseconds from 1970 on. How can I convert this in a humanreadable date like;

DateTime.Now

Maybe somone can help me directly:

sbyte []state = new sbyte[100];
ds1994.getClock(state);
state = ds1994.readDevice();
label10.Text = ds1994.getClock(state).ToString();

I can convert a normal time to milliseconds from 1970:

DateTime neu = DateTime.Now;
TimeSpan zeit = (neu - new DateTime(1970, 1, 1));
label14.Text = zeit.TotalMilliseconds.ToString();

Is the no function back, like "fromMillisecondsToDate"?
Thanks alot for helping.
Best,
Stephan

 

[B00gyeMan]

You mean you need something like the following?

DateTime m_dtDateTime = new DateTime( 1970, 1, 1, 0, 0, 0, 0); // In order to start from 1/1/1970 00:00.00
m_dtDateTime.AddMilliseconds( zeit.TotalMilliseconds);
label14.Text = m_dtDateTime.ToString()

 

[kognitio]

well ... thanks. that is working.
but not at all. I am getting the wrong years, means I am getting "0036", which is logical, because it is counting the years from 1970 to today. But ho can I get the correct years???
this is the code:

double we = 0;
double rt = 0;
we = Convert.ToDouble(ds1994.getClock(state));
rt = Convert.ToDouble(ds1994.getClockAlarm(stateAlarm));
long millis = (long) rt;
long mill = (long) we;
DateTime alarm = new DateTime(millis * 10);
DateTime clock= new DateTime(mill * 10);
				
label10.Text = clock.AddMilliseconds(mill).ToString();
				

label11.Text = alarm.AddMilliseconds(millis).ToString();

thanks alot for helping.
Best,
Stephan

 

[chiph]

You can call the AddYears() method to add 1970 back in.

Chip H.


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[obislavu]

If you have the time in milliseconds counted from 1970,01,01 then the following line will give you the date and time:

DateTime dt = new DateTime( new DateTime(1970,01,01).Ticks + mssince1970*TimeSpan.TicksPerMillisecond);

if mssince1970 = 946684800000 then you should get 01/01/2000.
obislavu