[Vuejs]-I don't know how to set up a calendar in Vuetify." NaN is not a valid timestamp. It must be a Date, number of seconds since Epoch, I get

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If you are using the same code in the documentation in the function mouseMove in the condition

if (this.dragEvent && this.dragTime != null)

change to

if (this.dragEvent && this.dragTime)

it works for me.

When i had this error, i checked the value of this.dragTime and it was undefined and the condition was true so i removed != null and if this.dragTime is null or undefined never enter to the condition and you never receive a NaN

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