Force user to input an specific time format

Hi, how can a I force users to input in a cell of a uitable a specific time format, Hh:mm, and warn trough a message for wrong inputs. Thanks!

Answer 1

[Walter Roberson]

parts = regexp(INPUT, '^([01]\d|2[0-3]):[0-5]\d$');
if isempty(parts)
    reject
end

This assumes that you want 24 hour clock with forced leading 0 and that you do not want to permit 24:00

[dpb]

GEEZER ALERT

"...and that you do not want to permit 24:00"

Lo! so many years ago had a line of online coal analyzers running under MS-DOS on industrial PCs. The app was built on MS Professional Basic 7.1 with additional assembler for the touchscreen UI and the multichannel analyzer (it was a dual-energy gamma densitometer at heart).

The system at a particular installation began crashing at midnight with a non-trapable error -- took several months of debugging before I finally caught it out--the DATE$/TIME$ function returned 24:00:00, 24:00:01, ... at midnight for roughly 30 seconds before it rolled over to 00:00:31, 00:00:32, ...

A bunch of data-storage arrays were defined with indices by hour from 0:23 and the 24 index caused an out-of-bounds memory address that corrupted BASIC string space and when the garbage collector would run in the background, boom!

Answer 2

[dpb]

Only with a lot of trouble -- use a datepicker UI control instead uidatepicker

[Cristian Martin]

I have R2015a, and that option is not viable!

[dpb]

Lots of callbacks, then, examaning keystrokes...see if anybody has written anything for purpose on FEX.

[Cristian Martin]

I managed to do something with if not from cell edit callback... 😉. If there's no : input user receive a warning message