/// <summary>Returns the current date and time, just like DateTime.UtcNow.</summary>
public DateTime GetUtcNow()
{
var stopWatchTicks = _stopwatch.ElapsedTicks;
var immutable = _immutable;
if (stopWatchTicks < immutable.ObservedTicks + _synchronizePeriodStopwatchTicks)
{
return(immutable.BaseTime.AddTicks(((
stopWatchTicks - immutable.ObservedTicks) * ClockTickFrequency) / (immutable.StopWatchFrequency)));
}
else
{
var utc = DateTime.UtcNow;
DateTime tBaseNew = immutable.BaseTime.AddTicks(((stopWatchTicks - immutable.ObservedTicks) * ClockTickFrequency) / (immutable.StopWatchFrequency));
_immutable = new DateTimePreciseSafeImmutable(
utc,
tBaseNew,
stopWatchTicks,
((stopWatchTicks - immutable.ObservedTicks) * ClockTickFrequency * 2) / (3 * utc.Ticks - 2 * immutable.ObservedTime.Ticks - tBaseNew.Ticks));
return(tBaseNew);
}
}
/// <summary>Creates a new instance of DateTimePrecise.
/// A large value of synchronizePeriodSeconds may cause arithmetic overthrow
/// exceptions to be thrown. A small value may cause the time to be unstable.
/// A good value is 10.
/// synchronizePeriodSeconds = The number of seconds after which the
/// DateTimePrecise will synchronize itself with the system clock.</summary>
public DateTimePrecise(long synchronizePeriodSeconds)
{
_stopwatch = Stopwatch.StartNew();
_stopwatch.Start();
var utc = DateTime.UtcNow;
_immutable = new DateTimePreciseSafeImmutable(utc, utc, _stopwatch.ElapsedTicks, Stopwatch.Frequency);
_synchronizePeriodStopwatchTicks = synchronizePeriodSeconds * Stopwatch.Frequency;
}
/// <summary>Creates a new instance of DateTimePrecise.
/// A large value of synchronizePeriodSeconds may cause arithmetic overthrow
/// exceptions to be thrown. A small value may cause the time to be unstable.
/// A good value is 10.
/// synchronizePeriodSeconds = The number of seconds after which the
/// DateTimePrecise will synchronize itself with the system clock.</summary>
public DateTimePrecise(long synchronizePeriodSeconds)
{
_stopwatch = Stopwatch.StartNew();
_stopwatch.Start();
var utc = DateTime.UtcNow;
_immutable = new DateTimePreciseSafeImmutable(utc, utc, _stopwatch.ElapsedTicks, Stopwatch.Frequency);
_synchronizePeriodStopwatchTicks = synchronizePeriodSeconds * Stopwatch.Frequency;
}
/// Creates a new instance of DateTimePrecise.
/// A large value of synchronizePeriodSeconds may cause arithmetic overthrow
/// exceptions to be thrown. A small value may cause the time to be unstable.
/// A good value is 10.
/// synchronizePeriodSeconds = The number of seconds after which the
/// DateTimePrecise will synchronize itself with the system clock.
public DateTimePrecise(long synchronizePeriodSeconds)
{
Stopwatch = Stopwatch.StartNew();
this.Stopwatch.Start();
DateTime t = DateTime.UtcNow;
_immutable = new DateTimePreciseSafeImmutable(t, t, Stopwatch.ElapsedTicks,
Stopwatch.Frequency);
_synchronizePeriodSeconds = synchronizePeriodSeconds;
_synchronizePeriodStopwatchTicks = synchronizePeriodSeconds *
Stopwatch.Frequency;
_synchronizePeriodClockTicks = synchronizePeriodSeconds *
_clockTickFrequency;
}
/// <summary>
/// Creates a new instance of <see cref="DateTimePrecise"/>.
/// </summary>
/// <param name="synchronizePeriodSeconds">
/// The number of seconds after which the <see cref="DateTimePrecise"/>
/// will synchronize itself with the system clock. A large value may
/// cause arithmetic overflow exceptions to be thrown. A small value may
/// cause the time to be unstable. A good default value is 10.
/// </param>
private DateTimePrecise(long synchronizePeriodSeconds)
{
_stopwatch = Stopwatch.StartNew();
_stopwatch.Start();
var t = DateTime.UtcNow;
_immutable = new DateTimePreciseSafeImmutable(t, t, _stopwatch.ElapsedTicks,
Stopwatch.Frequency);
//_synchronizePeriodSeconds = synchronizePeriodSeconds;
_synchronizePeriodStopwatchTicks = synchronizePeriodSeconds *
Stopwatch.Frequency;
//_synchronizePeriodClockTicks = synchronizePeriodSeconds *
// ClockTickFrequency;
}
/// <summary>Returns the current date and time, just like DateTime.UtcNow.</summary>
public DateTime GetUtcNow()
{
var stopWatchTicks = _stopwatch.ElapsedTicks;
var immutable = _immutable;
if (stopWatchTicks < immutable.ObservedTicks + _synchronizePeriodStopwatchTicks)
{
return immutable.BaseTime.AddTicks(((
stopWatchTicks - immutable.ObservedTicks) * ClockTickFrequency) / (immutable.StopWatchFrequency));
}
else
{
var utc = DateTime.UtcNow;
DateTime tBaseNew = immutable.BaseTime.AddTicks(((stopWatchTicks - immutable.ObservedTicks) * ClockTickFrequency) / (immutable.StopWatchFrequency));
_immutable = new DateTimePreciseSafeImmutable(
utc,
tBaseNew,
stopWatchTicks,
((stopWatchTicks - immutable.ObservedTicks) * ClockTickFrequency * 2) / (3 * utc.Ticks - 2 * immutable.ObservedTime.Ticks - tBaseNew.Ticks));
return tBaseNew;
}
}