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hour to hour minute second conversion

Asked by sermet on 30 Aug 2016
Latest activity Edited by Teja Muppirala
on 30 Aug 2016
I have an array represents hours, for example;
hour=[13.20,15.30,14.46,21];
Is there any matlab function to convert these hours to hour, minute, second? Example output;
hms=[13 12 0;15 18 0;14 27 36;21 0 0];

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2 Answers

Answer by Stephen Cobeldick on 30 Aug 2016
Edited by Stephen Cobeldick on 30 Aug 2016
 Accepted Answer

The basic concept is easy to implement:
tmp = hour(:);
H = fix(tmp);
tmp = 60*(tmp-H);
M = fix(tmp);
tmp = 60*(tmp-M);
S = tmp;
hms = [H,M,S]
However this can lead to accumulated floating point errors. One way to resolve this would be to perform some intermediate rounding like this:
adj = 1e12;
tmp = round(hour(:)*adj)/adj;
H = fix(tmp);
tmp = round(60*(tmp-H)*adj)/adj;
M = fix(tmp);
tmp = round(60*(tmp-M)*adj)/adj;
S = tmp;
hms = [H,M,S]
to give
hms =
13 12 0
15 18 0
14 27 36
21 0 0

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Answer by Teja Muppirala
on 30 Aug 2016
Edited by Teja Muppirala
on 30 Aug 2016

myTimes=[13.20,15.30,14.46,21];
HR = hours(myTimes');
[H,M,S] = hms(HR);
HMS = [H M S]
This gives
HMS =
13 12 0
15 18 0
14 27 36
21 0 0

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