How does javascript read the value in the from_unixtime () object? Hurry!

as shown in the figure, if you write x.from_unixtime (xxx,xxx) directly with js, you will report an error directly. how should the value of this object be read? Hurry!

Mar.14,2021

x ["from_unixtime (dates,'%Y-%m-%d% HV% iRO% S')"] takes a value like this

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