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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
Current content can be found at unidata.ucar.edu.
To learn about what's going on, see About the Archive Site.
Simone,It is unclear what you are asking. If you want to write a single date into a Netcdf file, then I suggest writing a global string attribute named "date" with a value of, for example, "2007-May-17" or "2007-05-17". (First form preferred to prevent ambiguity. Always use four digit years.)
If your file contains a time series, and you want to add a list of dates to identify the time steps, then I strongly recommend that you add a numeric time coordinate variable that uses Udunits time encoding, and follows certain Netcdf standard conventions:
http://www.unidata.ucar.edu/software/udunits/ http://www.unidata.ucar.edu/software/netcdf/conventions.htmlI use parts of the COARDS and CF conventions for time coordinates, with good compatibility for graphics software such as Grads and NCL.
For a brief introduction, see the paragraphs on coordinate systems and calendar in the Best Practices document:
http://www.unidata.ucar.edu/software/netcdf/docs/BestPractices.htmlHere are my minimum recommendations to make a simple time coordinate variable:
Add a time coordinate array that is type double and one dimensional. DO NOT use a string array.
Name of time dimension = time Name of time coordinate variable = time Minimum attributes: * units = "days since 1800-1-1 0:0:0" * calendar = "gregorian" * long_name = "Time"It is good to also include the optional actual_range attribute, a type double array of dimension (2), containing the first and last values from the time coordinate variable.
This is a basic prototype for you. There are complexities regarding the data type and attributes that I will not go into unless needed. I hope this gets you started.
--Dave A. CU/CIRES Climate Diagnostics Center (CDC) NOAA/ESRL/PSD, Climate Analysis Branch (CAB) Simone Marras wrote:
Good morning, I am dealing with a set of *.nc files which do not contain any date nor information on the time and, for what I need to do with those files, I actually need to add the DATE as YY-MM-DD in the files.Has anyone ever gone through this?I hope someone can help me with this Thank you in advance, RegardsSimone
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