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using System;
using System.Diagnostics;
using System.Linq;
namespace System
{
public class DateTimePrecise
{
private static readonly DateTimePrecise Instance = new DateTimePrecise();
public static DateTime Now
{
get { return Instance.GetUtcNow().LocalDateTime; }
}
public static DateTime UtcNow
{
get { return Instance.GetUtcNow().UtcDateTime; }
}
public static DateTimeOffset NowOffset
{
get { return Instance.GetUtcNow().ToLocalTime(); }
}
public static DateTimeOffset UtcNowOffset
{
get { return Instance.GetUtcNow(); }
}
private const long TicksInOneSecond = 10000000L;
private readonly double _divergentSeconds;
private readonly double _syncSeconds;
private readonly Stopwatch _stopwatch;
private DateTimeOffset _baseTime;
public DateTimePrecise(int syncSeconds = 1, int divergentSeconds = 1)
{
_syncSeconds = syncSeconds;
_divergentSeconds = divergentSeconds;
_stopwatch = new Stopwatch();
Syncronize();
}
private void Syncronize()
{
lock (_stopwatch) {
_baseTime = DateTimeOffset.UtcNow;
_stopwatch.Restart();
}
}
public DateTimeOffset GetUtcNow()
{
var now = DateTimeOffset.UtcNow;
var elapsed = _stopwatch.Elapsed;
if (elapsed.TotalSeconds > _syncSeconds)
{
Syncronize();
// account for any time that has passed since the stopwatch was syncronized
elapsed = _stopwatch.Elapsed;
}
/**
* The Stopwatch has many bugs associated with it, so when we are in doubt of the results
* we are going to default to DateTimeOffset.UtcNow
* http://stackoverflow.com/questions/1008345
**/
// check for elapsed being less than zero
if (elapsed < TimeSpan.Zero)
return now;
var preciseNow = _baseTime + elapsed;
// make sure the two clocks don't diverge by more than defined seconds
if (Math.Abs((preciseNow - now).TotalSeconds) > _divergentSeconds)
return now;
return _baseTime + elapsed;
}
}
}
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