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Convert Unix Time Stamp

Posted on 2004-08-18
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Last Modified: 2008-02-01
Hello,

I have a table in a SQL Server 2000 Database. One of the columns holds Unix Time Stamp values. Is there a way to convert the time stamp to a viewer friendly version?

ie:

1092737700

to

08 / 17 / 2004

Thanks in advance...
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Question by:prodier
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6 Comments
 
LVL 17

Expert Comment

by:AerosSaga
ID: 11832945
how are you getting that date from 1092737700?
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LVL 37

Accepted Solution

by:
gregoryyoung earned 500 total points
ID: 11833912
DATEADD(SECOND, columnname, '01/01/1970') AS expr1
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LVL 37

Expert Comment

by:gregoryyoung
ID: 11833924
unix timestamps are seconds since standard epoch.
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LVL 17

Expert Comment

by:AerosSaga
ID: 11833954
yuck, lol
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LVL 37

Expert Comment

by:gregoryyoung
ID: 11833991
if you wanted to do it in code the operation would be the same ...

to GET a unix timestamp from a Date ...

            static private int UnixTimeStamp(DateTime d) {
                  TimeSpan t = d.Subtract(DateTime.Parse("1/1/1970"));
                  return (int) Math.Floor(t.TotalSeconds) ;
            }
0
 
LVL 20

Expert Comment

by:ihenry
ID: 11840112
Helo,

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
// calendar reference, at
// http://pumas.jpl.nasa.gov/PDF_Examples/04_21_97_1.pdf
const int NumDaysTo10000 = 3652059;
const int NumDaysTo1970 = 719162;

const long NumTicksPerDay = 864000000000;
const long NumTicksPerSecond = 10000000;

const long MaxTicks = NumDaysTo10000 * NumTicksPerDay -1;
const long MinTicks = 0;

// number of 100 nanosecond units from 1/1/1601 to 1/1/1970
Int64 TicksTo1970   = NumDaysTo1970 * NumTicksPerDay;

// number of seconds elapsed in Unix epoch timestamp
int elapsedEpoch = 1092737700;

// number of 100 nanosecond units from 1/1/1970 to now
Int64 TicksFrom1970 = elapsedEpoch * NumTicksPerSecond;

long universalTicks = TicksTo1970 + TicksFrom1970;
DateTime univDT = new DateTime(universalTicks);

// display elapsedEpoch in UTC
Console.WriteLine(univDT);

TimeZone tz = TimeZone.CurrentTimeZone;
long localTicks = universalTicks + tz.GetUtcOffset(univDT).Ticks;

if ((ulong)localTicks>(ulong)MaxTicks)
{
      if (localTicks>MaxTicks)
            localTicks = MaxTicks;
      else
            localTicks = MinTicks;
}

// Display in local time
Console.WriteLine( new DateTime(localTicks) );
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

This site provides unix timestamp to readable timestamp
http://www.onlineconversion.com/unix_time.htm

Conversely,
http://www.unixtimestamp.com/index.php

HTH
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