Calendar objects.
@param that the Calendar to compare to this.
@return 0 if the time represented by this Calendar is equal to the time represented by that Calendar, a value less than 0 if the time represented by this is before the time represented by that, and a value greater than 0 if the time represented by this is after the time represented by that.
@throws NullPointerException if that Calendar is null.
@throws IllegalArgumentException if the time of that Calendar can't be obtained because of invalid calendar values.
@stable ICU 3.4
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