/// <summary>
/// <para>Converts a given <see cref='System.DateTime'/> object to DMTF format.</para>
///
/// </summary>
/// <param name='date'>A <see cref='System.DateTime'/> object representing the datetime to be converted to DMTF datetime.</param>
/// <returns>
/// <para>A string that represents the DMTF datetime for the given DateTime object.</para>
/// </returns>
/// <remarks>
/// <para> Date and time in WMI is represented in DMTF datetime format. This format is explained in WMI SDK documentation.
/// The DMTF datetime string represented will be with respect to the UTC offset of the
/// current timezone. The lowest precision in DMTF is microseconds and
/// in <see cref='System.DateTime'/> is Ticks , which is equivalent to 100 of nanoseconds.
/// During conversion these Ticks are converted to microseconds and rounded
/// off to the the nearest microsecond.
/// </para>
/// </remarks>
/// <example>
/// <code lang='C#'>
/// // Convert the current time in System.DateTime to DMTF format
/// string dmtfDateTime = ManagementDateTimeConverter.ToDmtfDateTime(DateTime.Now);
/// </code>
/// <code lang='VB'>
/// ' Convert the current time in System.DateTime to DMTF format
/// Dim dmtfDateTime as String = ManagementDateTimeConverter.ToDmtfDateTime(DateTime.Now)
/// </code>
/// </example>
public static string ToDmtfDateTime(DateTime date)
{
string UtcString = String.Empty;
// Fill up the UTC field in the DMTF date with the current
// zones UTC value
System.TimeZone curZone = System.TimeZone.CurrentTimeZone;
System.TimeSpan tickOffset = curZone.GetUtcOffset(date);
long OffsetMins = (tickOffset.Ticks / System.TimeSpan.TicksPerMinute);
IFormatProvider frmInt32 = (IFormatProvider)CultureInfo.InvariantCulture.GetFormat(typeof(System.Int32));
// If the offset is more than that what can be specified in DMTF format, then
// convert the date to UniversalTime
if (Math.Abs(OffsetMins) > MAXSIZE_UTC_DMTF)
{
date = date.ToUniversalTime();
UtcString = "+000";
}
else
if ((tickOffset.Ticks >= 0))
{
UtcString = "+" + ((tickOffset.Ticks / System.TimeSpan.TicksPerMinute)).ToString(frmInt32).PadLeft(3, '0');
}
else
{
string strTemp = OffsetMins.ToString(frmInt32);
UtcString = "-" + strTemp.Substring(1, strTemp.Length - 1).PadLeft(3, '0');
}
string dmtfDateTime = date.Year.ToString(frmInt32).PadLeft(4, '0');
dmtfDateTime = (dmtfDateTime + date.Month.ToString(frmInt32).PadLeft(2, '0'));
dmtfDateTime = (dmtfDateTime + date.Day.ToString(frmInt32).PadLeft(2, '0'));
dmtfDateTime = (dmtfDateTime + date.Hour.ToString(frmInt32).PadLeft(2, '0'));
dmtfDateTime = (dmtfDateTime + date.Minute.ToString(frmInt32).PadLeft(2, '0'));
dmtfDateTime = (dmtfDateTime + date.Second.ToString(frmInt32).PadLeft(2, '0'));
dmtfDateTime = (dmtfDateTime + ".");
// Construct a DateTime with with the precision to Second as same as the passed DateTime and so get
// the ticks difference so that the microseconds can be calculated
DateTime dtTemp = new DateTime(date.Year, date.Month, date.Day, date.Hour, date.Minute, date.Second, 0);
System.Int64 microsec = ((date.Ticks - dtTemp.Ticks) * 1000) / System.TimeSpan.TicksPerMillisecond;
// fill the microseconds field
String strMicrosec = microsec.ToString((IFormatProvider)CultureInfo.InvariantCulture.GetFormat(typeof(System.Int64)));
if (strMicrosec.Length > 6)
{
strMicrosec = strMicrosec.Substring(0, 6);
}
dmtfDateTime = dmtfDateTime + strMicrosec.PadLeft(6, '0');
// adding the UTC offset
dmtfDateTime = dmtfDateTime + UtcString;
return(dmtfDateTime);
}
public static int TimestampToURI(char[] buf, int pos, DateTime value)
{
if (value.Kind == DateTimeKind.Utc)
{
value = value.ToLocalTime();
}
var offset = CurrentZone.GetUtcOffset(value);
if (offset.Minutes != 0)
{
return(TimestampConverter.Serialize(value.AddMinutes(offset.Minutes), buf, pos, offset.Hours));
}
return(TimestampConverter.Serialize(value, buf, pos, offset.Hours));
}
/// <summary>
/// <para>Converts a given DMTF datetime to <see cref='System.DateTime'/> object. The returned DateTime will be in the
/// current TimeZone of the system.</para>
/// </summary>
/// <param name='dmtfDate'>A string representing the datetime in DMTF format.</param>
/// <returns>
/// <para>A <see cref='System.DateTime'/> object that represents the given DMTF datetime.</para>
/// </returns>
/// <remarks>
/// <para> Date and time in WMI is represented in DMTF datetime format. This format is explained in WMI SDK documentation.
/// DMTF datetime string has an UTC offset which this datetime string represents.
/// During conversion to <see cref='System.DateTime'/>, UTC offset is used to convert the date to the
/// current timezone. According to DMTF format a particular field can be represented by the character
/// '*'. This will be converted to the MinValue of this field that can be represented in <see cref='System.DateTime'/>.
/// </para>
/// </remarks>
/// <example>
/// <code lang='C#'>
/// // Convert a DMTF datetime to System.DateTime
/// DateTime date = ManagementDateTimeConverter.ToDateTime("20020408141835.999999-420");
/// </code>
/// <code lang='VB'>
/// ' Convert a DMTF datetime to System.DateTime
/// Dim date as DateTime = ManagementDateTimeConverter.ToDateTime("20020408141835.999999-420")
/// </code>
/// </example>
public static DateTime ToDateTime(string dmtfDate)
{
int year = DateTime.MinValue.Year;
int month = DateTime.MinValue.Month;
int day = DateTime.MinValue.Day;
int hour = DateTime.MinValue.Hour;
int minute = DateTime.MinValue.Minute;
int second = DateTime.MinValue.Second;
int millisec = 0;
string dmtf = dmtfDate;
DateTime datetime = DateTime.MinValue;
// If the string passed is empty or null then throw
// an exception
if (dmtf == null)
{
throw new System.ArgumentOutOfRangeException("dmtfDate");
}
if (dmtf.Length == 0)
{
throw new System.ArgumentOutOfRangeException("dmtfDate");
}
// if the length of the string is not equal to the
// standard length of the DMTF datetime then throw an exception
if (dmtf.Length != SIZEOFDMTFDATETIME)
{
throw new System.ArgumentOutOfRangeException("dmtfDate");
}
IFormatProvider frmInt32 = (IFormatProvider)CultureInfo.InvariantCulture.GetFormat(typeof(System.Int32));
System.Int64 ticks = 0;
try
{
string tempString = System.String.Empty;
tempString = dmtf.Substring(0, 4);
if (("****" != tempString))
{
year = System.Int32.Parse(tempString, frmInt32);
}
tempString = dmtf.Substring(4, 2);
if (("**" != tempString))
{
month = System.Int32.Parse(tempString, frmInt32);
}
tempString = dmtf.Substring(6, 2);
if (("**" != tempString))
{
day = System.Int32.Parse(tempString, frmInt32);
}
tempString = dmtf.Substring(8, 2);
if (("**" != tempString))
{
hour = System.Int32.Parse(tempString, frmInt32);
}
tempString = dmtf.Substring(10, 2);
if (("**" != tempString))
{
minute = System.Int32.Parse(tempString, frmInt32);
}
tempString = dmtf.Substring(12, 2);
if (("**" != tempString))
{
second = System.Int32.Parse(tempString, frmInt32);
}
tempString = dmtf.Substring(15, 6);
if (("******" != tempString))
{
ticks = (System.Int64.Parse(tempString, (IFormatProvider)CultureInfo.InvariantCulture.GetFormat(typeof(System.Int64)))) * (System.TimeSpan.TicksPerMillisecond / 1000);
}
if (year < 0 || month < 0 || day < 0 || hour < 0 || minute < 0 || second < 0 || ticks < 0)
{
throw new System.ArgumentOutOfRangeException("dmtfDate");
}
}
catch
{
throw new System.ArgumentOutOfRangeException("dmtfDate");
}
// Construct a new System.DateTime object
datetime = new System.DateTime(year, month, day, hour, minute, second, millisec);
// Then add the ticks calculated from the microseconds
datetime = datetime.AddTicks(ticks);
// Adjust the UTC time to reflect the current zone time
System.TimeZone curZone = System.TimeZone.CurrentTimeZone;
System.TimeSpan tickOffset = curZone.GetUtcOffset(datetime);
long OffsetMins = tickOffset.Ticks / System.TimeSpan.TicksPerMinute;
// Adjusting the DateTime for the current UTC
int UTCOffset = 0;
string tempString1 = dmtf.Substring(22, 3);
long OffsetToBeAdjusted = 0;
if (("***" != tempString1))
{
tempString1 = dmtf.Substring(21, 4);
try
{
UTCOffset = System.Int32.Parse(tempString1, frmInt32);
}
catch
{
throw new System.ArgumentOutOfRangeException();
}
OffsetToBeAdjusted = UTCOffset - OffsetMins;
// We have to substract the minutes from the time
datetime = datetime.AddMinutes(OffsetToBeAdjusted * -1);
}
return(datetime);
}