Let’s say you created a new TimeSpan object by using the Start parameter.
PS> $ts = New-TimeSpan -Start 1/1/2014 PS> $ts Days : -324 Hours : -9 Minutes : -44 Seconds : -12 Milliseconds : -596 Ticks : -280286525960331 TotalDays : -324.405701342976 TotalHours : -7785.73683223142 TotalMinutes : -467144.209933885 TotalSeconds : -28028652.5960331 TotalMilliseconds : -28028652596.0331
You ended up with an object whose value is negative because the start date is greater than the end date. PowerShell assigns the current date to the End parameter if no value has been specified. So, what do you do if you need a positive value? If you send the object to the Get-Member cmdlet you’ll notice a method called Negate.
PS> $ts | Get-Member -MemberType Method TypeName: System.TimeSpan Name MemberType Definition ---- ---------- ---------- Add Method timespan Add(timespan ts) CompareTo Method int CompareTo(System.Object value), int CompareTo(timespan value), int IComparable.CompareTo(... Duration Method timespan Duration() Equals Method bool Equals(System.Object value), bool Equals(timespan obj), bool IEquatable[timespan].Equals... GetHashCode Method int GetHashCode() GetType Method type GetType() Negate Method timespan Negate() Subtract Method timespan Subtract(timespan ts) ToString Method string ToString(), string ToString(string format), string ToString(string format, System.IFor...
All you need to do is invoke it.
PS> $ts.Negate() Days : 324 Hours : 9 Minutes : 44 Seconds : 12 Milliseconds : 596 Ticks : 280286525960331 TotalDays : 324.405701342976 TotalHours : 7785.73683223142 TotalMinutes : 467144.209933885 TotalSeconds : 28028652.5960331 TotalMilliseconds : 28028652596.0331
Likewise, invoking the method on a positive object gives you back a negative instance.
