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addWeeks
A function that adds and subtracts weeks from a Date object.
ts
addWeeks(new Date(2016, 5, 1), 3); // 2016-6-22
addWeeks(new Date(2016, 5, 1), -3); // 2015-5-11
Parameters
date Date
The initial date value.
offset number
The number of weeks to add/subtract from the date.
Returns
Date - A new Date
instance.