G'Day Is there a standard definition for time that people have been using ? Currently I have defined time as the set Year,Day,Hour,Min,Sec,Milsec which suits my purposes. However if there is an already existing standard I am certainly willing to change. I have been struggling with another problem for a week or so, and I would sure appreciate your help with it. Suppose I have an variable of rank 2 with dimension names TIME and FIELD and dimsizes UNLIMITED and 3 eg: TIME FIELD 0 1 2 4 1 3 4 1 2 5 6 7 What is the correct (or standard way) of labelling the individual elements of FIELD (ie the three columns) ? Currently I have abandoned using a single variable since I couldn't figure out a "standard" way of doing it. I guess one method would be to create new attributes and make up a naming convention, but this would not be standard and I am trying to make my data sets as easily transportable between different plotting/analysis packages as possible. I am also not sure if "splitting" FIELD into 3 variables has significantly affected the time it takes to read a single TIME and FIELD record. Any help would be greatly appreciated. best regards Ata <(|)>.