cdm/src/main/java/ucar/nc2/time/CalendarPeriod.java
public double getValueInMillisecs() {
     if (field == CalendarPeriod.Field.Month)
       return 30.0 * 24.0 * 60.0 * 60.0 * 1000.0 * value;
     else if (field == CalendarPeriod.Field.Year)
       return 365.0 * 24.0 * 60.0 * 60.0 * 1000.0 * value;
     else return millisecs();
   }
public double getValueInMillisecs() {
     if (field == CalendarPeriod.Field.Month)
       return 30.0 * 24.0 * 60.0 * 60.0 * 1000.0 * value;
     else if (field == CalendarPeriod.Field.Year)
       return 365.0 * 24.0 * 60.0 * 60.0 * 1000.0 * value;
     else return millisecs();
   }
Get the duration in milliseconds                                               -+
@return the duration in seconds
@deprecated dont use because these are fixed length and thus approximate.