Why only some datetime are imported?

I have generated and automatic function to import several columns of around 5000 data from excel to matlab. Double type data are imported without problems but for some reason function imports only around 50 datetime cells.

Problem does not occur when I import datetime manually but always occurs when function is used.

Everything is fine with data - that's for sure.

Any ideas?

[dpb]

Show the function and attach the file...