A week is just 7 days. Its length is unambiguous in the Gregorian calendar. Even if different locales may consider different week days as denoting the start of a new week, "one week" from now or any time is still always equal to "7 days" from now or any time.
This widget instead uses "month" and "year", which in theory should be different length based on a base time, and in practice are rounded to 30 days for a month, and 360 days for a year to avoid tying it to a specific date and time.
A week is just 7 days. Its length is unambiguous in the Gregorian calendar. Even if different locales may consider different week days as denoting the start of a new week, "one week" from now or any time is still always equal to "7 days" from now or any time.
This widget instead uses "month" and "year", which in theory should be different length based on a base time, and in practice are rounded to 30 days for a month, and 360 days for a year to avoid tying it to a specific date and time.