Automatic cast from string to date for value comparison, yes or no?

[YW5kcmV5]

In the ordering actions such as "order" or "sort", or in value comparison operations such as "min" or "max", should the string with date be automatically cast to date for correct comparison?

What is the correct regex that should be used for a string with date recognition?

Example: "1989-01-01" vs new Date("1990-01-01")

What about
"/^(-?(?:[1-9][0-9]*)?[0-9]{4})-(1[0-2]|0[1-9])-(3[01]|0[1-9]|[12][0-9])T(2[0-3]|[01][0-9]):([0-5][0-9]):([0-5][0-9])(.[0-9]+)?(:([0-5][0-9]))?(Z)?$/"
?