[Add, Feat] #6 - date 생성, str 변환 함수 생성

35-seminar/Presentation/Week2/Extensions/Date+Extension.swift

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+//
+//  Date+Extension.swift
+//  35-seminar
+//
+//  Created by 김유림 on 10/25/24.
+//
+
+import Foundation
+
+extension Date {
+    static func form(year: Int, month: Int, day: Int) -> Date? {
+        var dateComponents = DateComponents()
+        dateComponents.year = year
+        dateComponents.month = month
+        dateComponents.day = day
+
+        return Calendar.current.date(from: dateComponents)
+    }
+
+    static func formattedDate(date: Date?) -> String {
+        guard let inputDate = date else { return "날짜 없음" }
+
+        let currentYear = Calendar.current.component(.year, from: Date())
+        let inputYear = Calendar.current.component(.year, from: inputDate)
+        let yearDifference = currentYear - inputYear
+
+        guard yearDifference > 0 else {
+            let dateFormatter = DateFormatter()
+            dateFormatter.dateFormat = "M월 d"
+            return dateFormatter.string(from: inputDate)
+        }
+
+        return "\(yearDifference)년 전"
+    }
+}