How do I convert a string to a date?

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ARGY B
ARGY B 2019-8-14
评论： Star Strider 2019-8-15
I have a txt file with dates in the following form:
200309302300
200309302310
200309302320
......etc
How can I convert these strings into date form?
something like : 2003-Sep-30 23:00 or 2003-09-30 23:00

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Star Strider
Star Strider 2019-8-14
I am not certain if the numbers are themselves strings, or numbers.
If they are numbers, this works:
numdate = [200309302300
200309302310
200309302320];
dn = datenum(num2str(numdate), 'yyyymmddHHMM') % Date Numbers
dv = datevec(dn)
dt = datetime(num2str(numdate), 'InputFormat','yyyyMMddHHmm') % ‘datetime’ Array
If they are strings, omit the str2num calls and just insert them directly.

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