Mercurial > hg > ltpda
view m-toolbox/classes/@time/datenum.m @ 8:2f5c9bd7d95d database-connection-manager
Clarify ltpda_uo.retrieve parameters handling
author | Daniele Nicolodi <nicolodi@science.unitn.it> |
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date | Mon, 05 Dec 2011 16:20:06 +0100 |
parents | f0afece42f48 |
children |
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% DATENUM Converts a time object into MATLAB serial date representation %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % DESCRIPTION: Converts a time object into MATLAB serial date number. A serial % date number of 1 corresponds to Jan-01-0000. The year 0000 is merely a % reference point and is not intended to be interpreted as a real year. % % NOTE: time objects formatting routines use the timezone specified in the LTPDA % toolbox preferences, while MATLAB time routines always work in the local time % zone, as specified by the operating system. This conversion routine is built % so that the time string representation obtained by time.format() and the one % obtained from datestr(datenum(time)) are equivalent: % % >> t1 = time(); % >> datestr(datenum(t1)) === t1.format('dd-mmm-yyyy HH:MM:SS') % % However, except in the cases where the timezone is set to UTC in the LTPDA % toolbox preferences, this implies that: % % >> datenum(time()) ~= now() % % VERSION: $Id: datenum.m,v 1.2 2010/07/29 18:07:55 nicolodi Exp $ % %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% function num = datenum(obj) % number of seconds since 1970-01-01 00:00:00.000 UTC num = double(obj); % take care of timezone offset num = num + time.timezone.getOffset(num * 1000)/1000; % divide by 60*60*24 to convert into days and add offset computed in local time num = num / 86400 + datenummx(1970,01,01,00,00,00); % NOTE: the MEX function datenummx() is used instead of the datenum() MATLAB % function to save time of the expensive input arguments checks performed by % the later end