Safely converts the given time in the specified time zone to Coordinated Universal Time (UTC). If the dateTime is an invalid time (that is, it represents a time that does not exist because of a time zone's adjustment rules), then this method rounds it to the nearest valid date time instead of throwing an exception.

public static System.DateTime SafeConvertTimeToUtc( 
   System.DateTime dateTime,
   NTimeZone sourceTimeZone
)