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datenum problem with conversion

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jenka
jenka on 18 Jan 2017
Closed: MATLAB Answer Bot on 20 Aug 2021
I have a question. I am trying to use datenum function as below. Question: why ans1=ans2? Am I using format wrongly? Thank you!
ans1 = datenum('4:30:00 PM','HH:MM:SS PM')
ans1 =
7.3670e+05
ans2 = datenum('2:30:00 PM','HH:MM:SS PM')
ans2 =
7.3670e+05
  2 Comments
Stephen23
Stephen23 on 19 Jan 2017
Are they the same?
>> format longg
>> datenum('4:30:00 PM','HH:MM:SS PM')
ans =
736696.6875
>> datenum('2:30:00 PM','HH:MM:SS PM')
ans =
736696.604166667

This question is closed.

Answers (1)

Star Strider
Star Strider on 18 Jan 2017
They’r not the same. Use the format function to display the entire number in full precision:
format long g
ans1 = datenum('4:30:00 PM','HH:MM:SS PM')
ans2 = datenum('2:30:00 PM','HH:MM:SS PM')
ans1 =
736696.6875
ans2 =
736696.604166667
  1 Comment
Jan
Jan on 19 Jan 2017
Alternatively:
ans1 = datenum('4:30:00 PM','HH:MM:SS PM')
ans2 = datenum('2:30:00 PM','HH:MM:SS PM')
ans1 - ans2
% And:
(ans1 - ans2) * 86400

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