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annotate m-toolbox/classes/@time/datenum.m @ 0:f0afece42f48

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Import.
author Daniele Nicolodi <nicolodi@science.unitn.it>
date Wed, 23 Nov 2011 19:22:13 +0100
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Daniele Nicolodi <nicolodi@science.unitn.it>
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1 % DATENUM Converts a time object into MATLAB serial date representation
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2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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3 % DESCRIPTION: Converts a time object into MATLAB serial date number. A serial
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4 % date number of 1 corresponds to Jan-01-0000. The year 0000 is merely a
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5 % reference point and is not intended to be interpreted as a real year.
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6 %
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7 % NOTE: time objects formatting routines use the timezone specified in the LTPDA
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8 % toolbox preferences, while MATLAB time routines always work in the local time
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9 % zone, as specified by the operating system. This conversion routine is built
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10 % so that the time string representation obtained by time.format() and the one
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11 % obtained from datestr(datenum(time)) are equivalent:
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12 %
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13 % >> t1 = time();
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14 % >> datestr(datenum(t1)) === t1.format('dd-mmm-yyyy HH:MM:SS')
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15 %
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16 % However, except in the cases where the timezone is set to UTC in the LTPDA
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17 % toolbox preferences, this implies that:
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18 %
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19 % >> datenum(time()) ~= now()
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20 %
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21 % VERSION: $Id: datenum.m,v 1.2 2010/07/29 18:07:55 nicolodi Exp $
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22 %
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23 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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24
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25 function num = datenum(obj)
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26
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27 % number of seconds since 1970-01-01 00:00:00.000 UTC
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28 num = double(obj);
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29
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30 % take care of timezone offset
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31 num = num + time.timezone.getOffset(num * 1000)/1000;
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32
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33 % divide by 60*60*24 to convert into days and add offset computed in local time
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34 num = num / 86400 + datenummx(1970,01,01,00,00,00);
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36 % NOTE: the MEX function datenummx() is used instead of the datenum() MATLAB
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37 % function to save time of the expensive input arguments checks performed by
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Daniele Nicolodi <nicolodi@science.unitn.it>
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38 % the later
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39
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40 end
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