Assign date values manually to datetime array matlab

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Ganesh Naik
Ganesh Naik 2021-4-8
评论： Ganesh Naik 2021-4-9
Hi all, I have this date data (attached) where I need to assign the day numbers (manually) as 1, 2 etc using the starting date (in this example '2021-02-05 05:02:00' as day 1 and '2021-03-07 04:57:00' as say 31). I use Matlab function "day(data)" where it gives me the day numbers based on calender date ('2021-03-07 04:57:00' as day 5). Could you please help me to assign the date manually.
Thanks in advance

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Rik
Rik 2021-4-8
Ran in:
For pre-R2020b, you can use readfile, which you can get readfile from the FEX. If you are using R2017a or later, you can also get it through the AddOn-manager.
date_list=readlines('https://www.mathworks.com/matlabcentral/answers/uploaded_files/576897/Date.txt');
date_list=strrep(date_list,'''','');%remove quotes
date_list=datetime(date_list,'InputFormat','yyyy-MM-dd HH:mm:ss')
date_list = 31×1 datetime array
05-Feb-2021 05:02:00 06-Feb-2021 04:56:00 07-Feb-2021 05:29:00 08-Feb-2021 04:25:00 09-Feb-2021 03:55:00 10-Feb-2021 04:50:00 11-Feb-2021 03:30:00 12-Feb-2021 04:03:00 13-Feb-2021 04:12:00 14-Feb-2021 04:23:00 15-Feb-2021 04:14:00 16-Feb-2021 05:38:00 17-Feb-2021 04:23:00 18-Feb-2021 03:31:00 19-Feb-2021 03:06:00 20-Feb-2021 05:10:00 21-Feb-2021 04:04:00 22-Feb-2021 03:02:00 23-Feb-2021 04:29:00 24-Feb-2021 03:37:00 25-Feb-2021 03:22:00 26-Feb-2021 04:28:00 27-Feb-2021 05:16:00 28-Feb-2021 04:50:00 01-Mar-2021 04:16:00 02-Mar-2021 02:34:00 03-Mar-2021 05:06:00 04-Mar-2021 04:47:00 05-Mar-2021 04:40:00 06-Mar-2021 04:35:00
day_numbers=days(date_list-min(date_list))+1
day_numbers = 31×1
1.0000 1.9958 3.0187 3.9743 4.9535 5.9917 6.9361 7.9590 8.9653 9.9729
You can use round, floor, or ceil if you want round numbers.
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Rik
Rik 2021-4-9
You can round before subtracting the lowest to use only the day.

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