/// <summary>
/// Rounds the specified date time.
/// </summary>
/// <param name="dateTime">The date time.</param>
/// <param name="dateTimeRoundingAccuracy">The date time rounding accuracy.</param>
/// <param name="midpointRounding">The midpoint rounding.</param>
/// <returns></returns>
public static DateTime Round(this DateTime dateTime, DateTimeRoundingAccuracy dateTimeRoundingAccuracy, MidpointRounding midpointRounding)
{
switch (midpointRounding)
{
case MidpointRounding.AwayFromZero:
switch (dateTimeRoundingAccuracy)
{
case DateTimeRoundingAccuracy.Millisecond: return(new DateTime(dateTime.Year, dateTime.Month, dateTime.Day, dateTime.Hour, dateTime.Minute, dateTime.Second, 0, dateTime.Kind));
case DateTimeRoundingAccuracy.Second: return(new DateTime(dateTime.Year, dateTime.Month, dateTime.Day, dateTime.Hour, dateTime.Minute, 0, 0, dateTime.Kind));
case DateTimeRoundingAccuracy.Minute: return(new DateTime(dateTime.Year, dateTime.Month, dateTime.Day, dateTime.Hour, 0, 0, 0, dateTime.Kind));
case DateTimeRoundingAccuracy.Hour: return(new DateTime(dateTime.Year, dateTime.Month, dateTime.Day, 0, 0, 0, 0, dateTime.Kind));
case DateTimeRoundingAccuracy.Day: return(new DateTime(dateTime.Year, dateTime.Month, 1, 0, 0, 0, 0, dateTime.Kind));
case DateTimeRoundingAccuracy.Month: return(new DateTime(dateTime.Year, 1, 1, 0, 0, 0, 0, dateTime.Kind));
default: throw new NotSupportedException();
}
case MidpointRounding.ToEven:
int s, m, h, d, mm, daysInMonth;
double ms = 0;
switch (dateTimeRoundingAccuracy)
{
case DateTimeRoundingAccuracy.Millisecond:
#region Millisecond
return(dateTime.AddMilliseconds(
dateTime.Millisecond >= 500 ? 1000 - dateTime.Millisecond
: dateTime.Millisecond * -1));
#endregion
case DateTimeRoundingAccuracy.Second:
#region Second
if (dateTime.Millisecond >= 500)
{
s = dateTime.Second + 1;
ms += 1000 - dateTime.Millisecond;
}
else
{
s = dateTime.Second;
ms -= dateTime.Millisecond;
}
if (s >= 30 && s < 60)
{
ms += 1000;
}
return(dateTime.AddMilliseconds(ms));
#endregion
case DateTimeRoundingAccuracy.Minute:
#region Minute
if (dateTime.Millisecond >= 500)
{
s = dateTime.Second + 1;
ms += 1000 - dateTime.Millisecond;
}
else
{
s = dateTime.Second;
ms -= dateTime.Millisecond;
}
if (s >= 60)
{
m = dateTime.Minute + 1;
}
else if (s >= 30)
{
m = dateTime.Minute + 1;
ms += 1000;
}
else
{
m = dateTime.Minute;
}
if (m >= 30 && m < 60)
{
ms += 60000;
}
return(dateTime.AddMilliseconds(ms));
#endregion
case DateTimeRoundingAccuracy.Hour:
#region Hour
if (dateTime.Millisecond >= 500)
{
s = dateTime.Second + 1;
ms += 1000 - dateTime.Millisecond;
}
else
{
s = dateTime.Second;
ms -= dateTime.Millisecond;
}
if (s >= 60)
{
m = dateTime.Minute + 1;
}
else if (s >= 30)
{
m = dateTime.Minute + 1;
ms += 1000;
}
else
{
m = dateTime.Minute;
}
if (m >= 60)
{
h = dateTime.Hour + 1;
}
else if (m >= 30)
{
h = dateTime.Hour + 1;
ms += 60000;
}
else
{
h = dateTime.Hour;
}
if (h >= 12 && h < 24)
{
ms += 3600000;
}
return(dateTime.AddMilliseconds(ms));
#endregion
case DateTimeRoundingAccuracy.Day:
#region Day
if (dateTime.Millisecond >= 500)
{
s = dateTime.Second + 1;
ms += 1000 - dateTime.Millisecond;
}
else
{
s = dateTime.Second;
ms -= dateTime.Millisecond;
}
if (s >= 60)
{
m = dateTime.Minute + 1;
}
else if (s >= 30)
{
m = dateTime.Minute + 1;
ms += 1000;
}
else
{
m = dateTime.Minute;
}
if (m >= 60)
{
h = dateTime.Hour + 1;
}
else if (m >= 30)
{
h = dateTime.Hour + 1;
ms += 60000;
}
else
{
h = dateTime.Hour;
}
if (h >= 24)
{
d = dateTime.Day + 1;
}
else if (h >= 12)
{
d = dateTime.Day + 1;
ms += 3600000;
}
else
{
d = dateTime.Day;
}
daysInMonth = DateTime.DaysInMonth(dateTime.Year, dateTime.Month);
if (d >= daysInMonth / 2 && d < daysInMonth)
{
ms += (daysInMonth - d) * 86400000;
}
return(dateTime.AddMilliseconds(ms));
#endregion
case DateTimeRoundingAccuracy.Month:
#region month
if (dateTime.Millisecond >= 500)
{
s = dateTime.Second + 1;
}
else
{
s = dateTime.Second;
ms -= dateTime.Millisecond;
}
if (s >= 60)
{
m = dateTime.Minute + 1;
}
else if (s >= 30)
{
m = dateTime.Minute + 1;
ms += 1000;
}
else
{
m = dateTime.Minute;
}
if (m >= 60)
{
h = dateTime.Hour + 1;
}
else if (m >= 30)
{
h = dateTime.Hour + 1;
ms += 60000;
}
else
{
h = dateTime.Hour;
}
if (h >= 24)
{
d = dateTime.Day + 1;
}
else if (h >= 12)
{
d = dateTime.Day + 1;
ms += 3600000;
}
else
{
d = dateTime.Day;
}
daysInMonth = DateTime.DaysInMonth(dateTime.Year, dateTime.Month);
if (d >= daysInMonth / 2)
{
mm = dateTime.Month + 1;
}
else
{
mm = dateTime.Month;
}
if (mm >= 6)
{
return(new DateTime(dateTime.Year + 1, 1, 1, 0, 0, 0, 0, dateTime.Kind));
}
else
{
return(new DateTime(dateTime.Year, 1, 1, 0, 0, 0, 0, dateTime.Kind));
}
#endregion
default: throw new NotSupportedException();
}
default: throw new NotSupportedException();
}
}
/// <summary>
/// Rounds the specified date time.
/// </summary>
/// <param name="dateTime">The date time.</param>
/// <param name="dateTimeRoundingAccuracy">The date time rounding accuracy.</param>
/// <returns></returns>
public static DateTime Round(this DateTime dateTime, DateTimeRoundingAccuracy dateTimeRoundingAccuracy)
{
return(Round(dateTime, dateTimeRoundingAccuracy, MidpointRounding.AwayFromZero));
}
