MATLAB: Char array, cell array or string array

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How to padd numbers with leading zero or to convert to two digits in cell array, string array or char arrays?
5×16 char array
'2020-01-1-11-15'
'2020-02-5-12-5 '
'2020-04-25-10-30'
'2020-07-15-3-15 '
'2020-12-3-17-6 '

Best Answer

    C = ['2020-01-1-11-15 '
         '2020-02-5-12-5  '
         '2020-04-25-10-30'
         '2020-07-15-3-15 '
         '2020-12-3-17-6  ']
C = 5x16 char array
    '2020-01-1-11-15 '
    '2020-02-5-12-5  '
    '2020-04-25-10-30'
    '2020-07-15-3-15 '
    '2020-12-3-17-6  '

    char(datetime(cellstr(C), 'InputFormat', 'uuuu-M-d-H-m', 'Format', 'uuuu-MM-dd-HH-mm'))
ans = 5x16 char array
    '2020-01-01-11-15'
    '2020-02-05-12-05'
    '2020-04-25-10-30'
    '2020-07-15-03-15'
    '2020-12-03-17-06'
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