matlab omiting milliseconds from datenum

Question

Let

x=7.369030000162731e+05

x is a matlab date and it is equal to

27.07.2017 00:00:01.406

I want to remove the milliseconds from it (ie. .406)

To do this I convert it to datestr with 'dd.mm.yyyy HH:MM:SS' format and then again to datenum

datenum(datestr(x,'dd.mm.yyyy HH:MM:SS'))

Is there a simpler way to do this.

For what it is worth, you can't accurately compare your approach with the answers below because of a subtle bug here (at least for my locale). Your date format string is different from what datenum is expecting and the result is changed to from July 27, 2017 to January 1, 2017 (for me). One way to fix this is to explicitly pass the format string as a second parameter to datenum like this: datenum(datestr(x,'dd.mm.yyyy HH:MM:SS'),'dd.mm.yyyy HH:MM:SS')). — informaton

gnovice gnovice · Accepted Answer · 2017-08-09T19:03:33

Here's a somewhat simpler way that converts x to a date vector, floors all the elements (which only affects the seconds value in index 6), then converts it back to a serial date number:

x = datenum(floor(datevec(x)));

matlab omiting milliseconds from datenum

2 Answers