https://blog.canopas.com/date-and-time-utilities-in-javascript-1f1330fd206e - add-dates

add.js

// Current date in millis : 1667813042954

// A year after : 1699353114157
console.log("A year after : ", new Date().setYear(cDate.getFullYear() + 1))

// 3 months after : 1675765990138
console.log("3 months after : ", new Date().setMonth(cDate.getMonth() + 3))

// 2 days after : 1667990027784
console.log("2 days after : ", new Date().setDate(cDate.getDate() + 2))

// 2 hours after : 1667824456277
console.log("2 hours after : ", new Date().setHours(cDate.getHours() + 2))

// 5 minutes after : 1667817585028
console.log("5 minutes after : ", new Date().setMinutes(cDate.getMinutes() + 5))