How to Convert ISO 8601 Duration to TimeSpan in VB.Net?

Question

Is there a standard library method that converts a string that has duration in the standard ISO 8601 Duration (also used in XSD for its duration type) format in

Answer 1

One minor word of caution - XmlConvert.ToTimeSpan() is a little funny when working with months and years. The TimeSpan class does not have month or year members, probably because their length varies. However, ToTimeSpan() will happily accept a duration string with month or year values in it and guess at a duration, instead of throwing an exception. Observe:

PS C:\Users\troll> [Reflection.Assembly]::LoadWithPartialName("System.Xml")

GAC    Version        Location
---    -------        --------
True   v2.0.50727     C:\Windows\assembly\GAC_MSIL\System.Xml\2.0.0.0__b77a5c561934e089\System.Xml.dll


PS C:\Users\troll> [System.Xml.XmlConvert]::ToTimeSpan("P1M")


Days              : 30
Hours             : 0
Minutes           : 0
Seconds           : 0
Milliseconds      : 0
Ticks             : 25920000000000
TotalDays         : 30
TotalHours        : 720
TotalMinutes      : 43200
TotalSeconds      : 2592000
TotalMilliseconds : 2592000000



PS C:\Users\troll> [System.Xml.XmlConvert]::ToTimeSpan("P1Y")


Days              : 365
Hours             : 0
Minutes           : 0
Seconds           : 0
Milliseconds      : 0
Ticks             : 315360000000000
TotalDays         : 365
TotalHours        : 8760
TotalMinutes      : 525600
TotalSeconds      : 31536000
TotalMilliseconds : 31536000000



PS C:\Users\troll>