MATLAB printing out time as a string - string

What is the most efficient way to print out time as HH:MM:SS?
I have it set up where my time is x seconds. Then I calculate the hours, minutes, and left over seconds associated with the x seconds.
Then when I want to print it out as a string onto a figure, I do:
sprintf('Time: %d:%d:%d', hours, minutes, seconds);
Unfortunately, this looks ugly as if I have hours or minutes equal to 0, I get something like 0:0:23.
I suppose I can change the hours, minutes, seconds to a string before doing the sprintf. Is there a more efficient MATLAB way though? Thanks!


The best option for date formatting is datestr, for example:
datestr(now, 'HH:MM:SS')
When it comes to sprintf, then have a look at the formatting parameters. You'll get a better result with zero-padding:
sprintf('Time: %02d:%02d:%02d', hours, minutes, seconds)

Related

Rounding error in SECOND function when converting hh:mm:ss.000 to milliseconds in Excel?

I am trying to write a function to convert a column of times entered in a [hh]:mm:ss.000 format to milliseconds using the following function:
=MINUTE(C75)*60000+SECOND(C75)*1000+RIGHT(TEXT(C75, "hh:mm:ss.000"),3)
From playing around with the numbers with a calculator, I've deduced that the problem is that the SECOND() function is rounding to the nearest second based on the milliseconds rather than copying the exact value. For example, 00:17:39.320 will convert correctly, but 00:17:39.760 will not, as the function will convert the seconds using 40 rather than 39.
Does anyone know ways around this?
Thank you!

Multiply your time by 86400000
=C75 * 86400000
Excel stores time as a fraction of a date. 12.00 noon will be .5 because its half of 24. Therefore 24 hours times 60 minutes times 60 seconds give you total seconds times 1000 milliseconds gives your desired result.

Converting Times in Excel with minutes and seconds

In Excel, I need to be able to extract a time of 51:25:00 that is entered as [h]:mm:ss and convert it into minutes and seconds as 51:25 and have the output show 51:25 as in 51 minutes and 25 seconds. Once I have extracted that time I need to convert it all into minutes so into 51.467 minutes that way I can perform other calculations with those minutes.
I cannot figure out a way to use LEFT() or MID() because of the format of the orginal cells.
I can enter in values as 51:25 with the format: [mm]:ss but that is quite time consuming. But I also do not know how to extract that time into minutes.
I am looking for a formula that can convert the [h]:mm:ss into the required [mm]:ss and then another formula to look at the minutes.

Perhaps something like the following:
=MINUTE(A1/60)+SECOND(A1/60)/60
More robustly perhaps,
=HOUR(A1/60)*60+MINUTE(A1/60)+SECOND(A1/60)/60

Difference between DATE & TIME values in seconds (Excel)

In my Excel sheet I have a column with dates and times which looks like this: 27.09.2016 14:02:03
I would like to get the difference between each pair of date in seconds.
For Example: 10.10.2016 13:00:10 - 10.10.2016 13:00:00 = 10s
If I do
= A 1- A2
I get 0,000115741
Can anyone please help me?

The value is in days (24 hours) not in seconds. 10 seconds are (almost) exactly that fraction of 24 hours that you get as the answer. Multiply it with 60x60x24 and you get your 10 seconds.

Alex. S response is good enough, you can also multiply what you are getting by 86400 (which is the result of 60*60*24, you just save some operations) There are other alternatives you can explore. You can take a look to this link:https://www.ablebits.com/office-addins-blog/2015/06/24/calculate-time-excel/

Excel units of time conversion

I need to change a value of time from days:hours:minutes, into either hours with a decimal or minutes. My data comes up as 001:05:46 for example. I am having trouble with the leading zeros confusing excel. Any help would be great!

Assuming that your value to parse is formatted in DDD:HH:MM like 001:05:46... There are a lot of ways to do this but here's a simple one. To convert into hours we need to take the days times 24 hours per day, add the hours, and add the minutes times 1 hour per 60 minutes:
=LEFT(A1,3)*24+MID(A1,5,2)+RIGHT(A1,2)/60
To get this value in terms of minutes we multiply by 60 minutes per hour. A possible modification of the original formula to reach this point would be:
=LEFT(A1,3)*24*60+MID(A1,5,2)*60+RIGHT(A1,2)

How to mathematically extract milliseconds, seconds and minutes from a serial date with an Excel-formula?

How can one calculate the seconds in a Excel serial date/time, linke in the example below, without the use of the SECOND() function which (I believe) rounds or cell-formatting? How can i extend this for minutes?
The serial values for the bottom example below (last row in the image) are:
Right: 41165.4444365394
Left: 41165.4444321412
The above example is being conditional formatted with the below two formula (With stop if true turned on, and order of precedence shown).
Seems to me that the second function cannot see the difference between 10:39:58 and 10:39:59, hence is not matching the 'Display only seconds' resolution one, and is carrying on to the 'Display milliseconds resolution' given that the calculation I have for milliseconds works fine.
To see if the seconds are different, first: =SECOND($B2)<>SECOND($C2)
To see if only milliseconds have passed between the two times:
=ROUND(($B2*86400-INT($B2*86400))*1000,0)<>ROUND(($C2*86400-INT($C2*86400))*1000,0)
What am I to multiply the serial number against to provide the unrounded seconds and minutes (seperately)?

Try using FLOOR function to differentiate, i.e.
=FLOOR($B2,"0:00:01")<>FLOOR($C2,"0:00:01")
This will also distinguish between times when, say, the seconds are the same but the minutes are different.
Edit: this will do the same
=INT($B2*86400)<>INT($C2*86400)

You were almost there, try it with this:
B2 = 41165.4444365394
C2 = 41165.4444321412
=(VALUE(TEXT(B2,"ss.000"))-ROUND(MOD(B2*86400,INT(B2*86400)),3))<>(VALUE(TEXT(C2,"ss.000"))-ROUND(MOD(C2*86400,INT(C2*86400)),3)
VALUE(TEXT(B2,"ss.000")) -> gives you 59,317
VALUE(TEXT(C2,"ss.000")) -> gives you 58,937
MOD(B2*86400,INT(B2*86400))
-> is more appropriate here than substracting, but basically the same thing
edit: using only math
i am not 100% sure about this, but it is not as straight forward with the time-values as it was for millisecs, and this is why:
excel interprets a value like 1.00001 as the January 1. 1900 00:00:01.
the part before . is the date, the part after is the time.
unfortunately time runs between .00000 and .99999, but your average day has only 86400 seconds - so 0.0000115740740740741 is the factor between them.
By dividing 0.00038 with this factor or multiplying it with 86400 you get 32.832 - which rounds to 33 seconds, as excel would do. You can use this to get the number of seconds in the given time.
edit:
here is my end solution for now
=INT(MOD(B2,INT(B2))/0.0000115740740740741))
this will transform you any time into seconds, so that you can compare by them without text formats - like this:
=INT(MOD(B2,INT(B2))/0.0000115740740740741))<>INT(MOD(C2,INT(C2))/0,0000115740740740741))
you don't have to worry about the ms, they will cut off by INT.
oh, and here is my source, that gave me the right clue:
http://support.microsoft.com/kb/214094/EN-US
edit thanks to barry houdini, I'll add some additional informations:
=INT(MOD(B2,INT(B2))/0.0000115740740740741)
=INT(MOD(B2,INT(B2))*86400)
=INT(MOD(B2,1)*86400)
-> 38399 seconds of the day, without ms
-> shows only time differences regardless of date
=MOD(B2,1)*86400
-> 38399.317 seconds of the day, with ms
=INT(B2*86400)
-> 3556697399 seconds since 1.1.1900
-> shows time & date differences
=INT(MOD(B2*24*60*60,60)) (=INT(MOD(B2*86400,60)))
-> 59 seconds, regardless of time & date, only the current seconds part
=INT(MOD(B2*24*60,60))
-> 39 minutes
=INT(MOD(B2*24,60))
-> 10 hours

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