The script imports the data into a cell array C:
Since from your comment on manhan ravi's answer the data is tabular in nature, consider using readtable to read the data from the file into a table array (importing the dates as datetime instead of plain text), table2timetable to convert the table into a timetable, and retime to make the times in the timetable regularly spaced. See the "Adjust Timetable by Inserting Missing Data Indicators" example on the retime function documentation page for an example that sounds similar to the application you described.
Alternately, since you already have the data in a cell array you could use cell2table instead of readtable to convert the already-imported data to a table. After that convert the text representing the dates and times in the first variable in the table into datetime using the datetime function. Finally continue as above with table2timetable and retime.
