weekday function odd results

2017 2 21
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更新时间：2017 2 21
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I am using the function weekday and I find that, for instance, on 19790531 and 19790601 are both Wednesdays according to the function. Not only is 19790531 a Thursday, two subsquent dates should not be assigned to the same weekday.
Can anyone shed some light on this?
ps:
I am simply doing:
[DayNumber,DayName] = weekday(19790531)

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Steven Lord
Steven Lord 2017-2-21

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That doesn't do what you think it does.
>> datestr(19790531)
ans =
18-Aug-4184
If you intended for that number to refer to May 31, 1979:
>> D = datetime(19790531, 'ConvertFrom', 'yyyymmdd')
D =
datetime
31-May-1979 00:00:00
>> [DayNumber, DayName] = weekday(D)
DayNumber =
5
DayName =
Thu

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