Gilles, > If I have data record for each 10 minutes > > . > 1960-01-01 00:00:00 data1 > 1960-01-01 00:10:00 data2 > 1960-01-01 00:20:00 data3 > 1960-01-01 00:30:00 data4 > 1960-01-01 00:40:00 data5 > 1960-01-01 00:50:00 data6 > 1960-01-01 01:00:00 data7 > 1960-01-01 01:10:00 data8 > 1960-01-01 01:20:00 data9 > 1960-01-01 01:30:00 data10 > 1960-01-01 01:40:00 data11 > 1960-01-01 01:50:00 data12 > 1960-01-01 02:00:00 data12 > . > > I search udunits standard for this > > a good format is > > time:units= "minutes since 1950-01-01 00:00" > > but my data is for each interval of 10 minutes possible use > > time:units= "10 minutes since 1950-01-01 00:00" ? > ^^ > Prefix with 10 for specify each 10 minutes That will work. You can test unit specifications using the utility that comes with the UDUNITS package: udunits(1) or udunits2(1) for the UDUNITS or UDUNITS-2 package, respectively. Regards, Steve Emmerson Ticket Details =================== Ticket ID: JKZ-243356 Department: Support UDUNITS Priority: Normal Status: Closed