open office spreadsheet problem

i use the spreadsheet on windows for a long time but when i decided to build a new computer i put linux on it and copied my spreadsheat files to open office but when i go to add new times it always converts it
example i put in 2:00 and it automaticlly changes to 02:00:00am

is there a way to stop it from doing that

Click on format->cells->time and choose a format that you like.