I had time 21:09 and i want to generate previous 10 time events like 21:08 to 20:59. so how to implement?

I used datenum but the difference between them is not same

Answer 1

[Joseph Cheng]

the units of datenum are in days so you need to subtract by the fraction of day.

 datestr(datenum('21:09')-1/24/60,15) %will return 21:08

so

 datestr(datenum('21:09')-[0:10]/24/60,15)

will generate the past 10 times

[johnphilip bhimavarapu]

Thanks a lot Joseph Cheng for the answer. and exactly what I'am looking for Thank you