class NodaTime.​AmbiguousTimeException

<para> This occurs for transitions where the clock goes backward (usually by an hour). For example, suppose the time zone goes backward at 2am, so the second after 01:59:59 becomes 01:00:00. In that case, times such as 01:30:00 occur twice. </para> <para> This exception is used to indicate such problems, as they're usually not the same as other <see cref="T:System.ArgumentOutOfRangeException" /> causes, such as entering "15" for a month number. </para> <para> In theory this isn't calendar-specific; the local value will be ambiguous in this time zone regardless of the calendar used. However, this exception is always created in conjunction with a specific calendar, which leads to a more natural way of examining its information and constructing an error message. </para>