convert datenum to date time series

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Ha Sen
Ha Sen 2018-7-3
评论： Ha Sen 2018-7-6
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.
  1 个评论
Stephen23
Stephen23 2018-7-3
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.

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采纳的回答

Peter Perkins
Peter Perkins 2018-7-5
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

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