Find Users Registered in Last N Days

MongoDB

Technical Specification

Query users whose createdAt is within the last 7 days.

Input/Output Samples

Input:N = 7 days

Output:List of recent signups

Optimal Logic Path

const sevenDaysAgo = new Date(Date.now() - 7 * 24 * 60 * 60 * 1000);
db.users.find({ createdAt: { $gte: sevenDaysAgo } });

Architectural Deep-Dive

Comparing dates with $gte/$lte lets us filter on ranges like 'last week' or 'this month'.