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function jDays = JulianDay(utcTime)
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% jDays = JulianDay(utcTime);
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%
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% input: utcTime [mx6] matrix [year,month,day,hours,minutes,seconds]
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%
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% output: totalDays in Julian Days [mx1] vector (real number of days)
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%
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% Valid input range: 1900 < year < 2100
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%Algorithm from Meeus, (1991) Astronomical Algorithms,
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%see http://www.geoastro.de/elevaz/basics/meeus.htm for online summary
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% valid range 1900/3/1 to 2100/2/28
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% but we limit inputs to 1901 through 2099, because it's simpler
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%Author: Frank van Diggelen
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%Open Source code for processing Android GNSS Measurements
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% check inputs
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if size(utcTime,2)~=6
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error('utcTime must have 6 columns')
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end
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y = utcTime(:,1);
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m = utcTime(:,2);
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d = utcTime(:,3);
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h = utcTime(:,4) + utcTime(:,5)/60 + utcTime(:,5)/3600;
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%check that date is in valid range
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if ( any(y<1901) || any (y>2099) )
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error('utcTime(:,1) not in allowed range: 1900 < year < 2100')
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end
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i2 = m<=2; %index into months <=2
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m(i2) = m(i2)+12;
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y(i2) = y(i2)-1;
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jDays = floor(365.25*y) + floor(30.6001*(m+1)) - 15 + 1720996.5 + d + h/24;
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end %end of function JulianDay
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% Copyright 2016 Google Inc.
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%
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% Licensed under the Apache License, Version 2.0 (the "License");
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% you may not use this file except in compliance with the License.
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% You may obtain a copy of the License at
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%
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% http://www.apache.org/licenses/LICENSE-2.0
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%
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% Unless required by applicable law or agreed to in writing, software
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% distributed under the License is distributed on an "AS IS" BASIS,
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% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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% See the License for the specific language governing permissions and
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% limitations under the License.
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