convert datenum to date time series

Hi,

I have a ncfile with datenum values <ftp://ftp.cdc.noaa.gov/Datasets/cpc_global_temp/>. Since I have to adjust the time series with another set of data, I tried to convert them to date time series but the values are off. I tried some solution given in MathWorks but non of them worked.

The nc file says:
    time
           Size:       365x1
           Dimensions: time
           Datatype:   double
           Attributes:
                       long_name          = 'Time'
                       axis               = 'T'
                       standard_name      = 'time'
                       coordinate_defines = 'start'
                       actual_range       = [1008072  1016808]
                       units              = 'hours since 1900-01-01 00:00:00'
                       delta_t            = '0000-00-01 00:00:00'
                       avg_period         = '0000-00-01 00:00:00'

How needs to be the conversion from their datenum to MATlab's datenum? Or is there another way to do it?

Any help is appreciated.

Thanks.

[Stephen23]

I think you will have to do this conversion yourself: all of the datetime conversions are for days or seconds since some epoch, but I don't see any that is hours since an epoch.

Answer 1

[Peter Perkins]

You can do this:

>> datetime(1900,1,1,0,0,0) + hours([1008072 1016808])
ans = 
  1×2 datetime array
   01-Jan-2015 00:00:00   31-Dec-2015 00:00:00

Or this (but more typing):

>> datetime([1008072 1016808]*3600,'ConvertFrom','EpochTime','Epoch',datetime(1900,1,1,0,0,0))
ans = 
  1×2 datetime array
   01-Jan-2015 00:00:00   31-Dec-2015 00:00:00

[Ha Sen]

Thanks Peter!