diff --git a/CoNet/Main/Home/CalendarDateFormatter.swift b/CoNet/Main/Home/CalendarDateFormatter.swift
index 359a8d8..ddf4e0c 100644
--- a/CoNet/Main/Home/CalendarDateFormatter.swift
+++ b/CoNet/Main/Home/CalendarDateFormatter.swift
@@ -8,9 +8,9 @@
 import Foundation
 
 class CalendarDateFormatter {
-    private var calendar = Calendar.current // Calendar 구조체를 현재 달력으로 초기화
-    private let dateFormatter = DateFormatter() // 원하는 String 타입으로 변화시켜줄 formatter
-    private var nowCalendarDate = Date() // 현재 시간
+    var calendar = Calendar.current // Calendar 구조체를 현재 달력으로 초기화
+    let dateFormatter = DateFormatter() // 원하는 String 타입으로 변화시켜줄 formatter
+    var nowCalendarDate = Date() // 현재 시간
     private(set) var days = [String]() // 달력에 표시할 날짜를 담을 배열
     
     init() {
diff --git a/CoNet/Main/Home/CalendarViewController.swift b/CoNet/Main/Home/CalendarViewController.swift
index e37e86d..c080f1c 100644
--- a/CoNet/Main/Home/CalendarViewController.swift
+++ b/CoNet/Main/Home/CalendarViewController.swift
@@ -11,7 +11,7 @@ import UIKit
 
 class CalendarViewController: UIViewController {
     var meetingId = 0
-    
+    var selectedDate: String?
     // MARK: UIComponents
 
     // 이전 달로 이동 버튼
@@ -76,7 +76,8 @@ class CalendarViewController: UIViewController {
         format.dateFormat = "yyyy. MM"
         
         // api 호출
-        getMonthPlanAPI(date: format.string(from: Date()))
+        getMonthPlanAPI(date: format.string(from: calendarDateFormatter.nowCalendarDate))
+        
     }
     
     private func setupCollectionView() {
@@ -176,6 +177,22 @@ class CalendarViewController: UIViewController {
         
         // api: 특정 달 약속 조회
         getMonthPlanAPI(date: changedHeader)
+        
+        // 캘린더에서 날짜 선택
+        selectDateOnCalendar()
+    }
+    
+    func selectDateOnCalendar() {
+        if let selectedDate = selectedDate {
+            let dateComponents = selectedDate.split(separator: ".").map { String($0) }
+            if dateComponents.count == 3 {
+                let day = dateComponents[2]
+                if let index = calendarDateFormatter.days.firstIndex(of: day) {
+                    let indexPath = IndexPath(item: index, section: 0)
+                    calendarCollectionView.selectItem(at: indexPath, animated: false, scrollPosition: [])
+                }
+            }
+        }
     }
 }
 
@@ -207,6 +224,8 @@ extension CalendarViewController: UICollectionViewDataSource, UICollectionViewDe
         // yyyy. MM. dd 형식
         let clickDate = calendarDateFormatter.changeDateType(date: calendarDate) + calendarDay
         
+        selectedDate = clickDate
+        
         if let parentVC = parent {
             if parentVC is HomeViewController {
                 // 부모 뷰컨트롤러가 HomeViewController
@@ -282,6 +301,12 @@ extension CalendarViewController: UICollectionViewDataSource, UICollectionViewDe
             cell.reloadPlanMark()
         }
         
+        // 셀의 날짜가 선택된 날짜와 일치하는지 확인
+        let cellDate = calendarDateFormatter.changeDateType(date: calendarDate) + calendarDateFormatter.formatNumberToTwoDigit(Int(cellDay) ?? 0)
+        if cellDate == selectedDate {
+            collectionView.selectItem(at: indexPath, animated: false, scrollPosition: [])
+        }
+        
         return cell
     }
 }
diff --git a/CoNet/Main/Home/HomeViewController.swift b/CoNet/Main/Home/HomeViewController.swift
index f2982c0..f9e1574 100644
--- a/CoNet/Main/Home/HomeViewController.swift
+++ b/CoNet/Main/Home/HomeViewController.swift
@@ -133,7 +133,7 @@ class HomeViewController: UIViewController {
             self.planNum.text = String(count)
             self.dayPlanData = plans
             self.dayPlanCollectionView.reloadData()
-            self.layoutConstraints()
+            self.updataPlanCollectionViewHeight()
         }
     }
     
@@ -143,7 +143,7 @@ class HomeViewController: UIViewController {
             self.waitingPlanNum.text = String(count)
             self.waitingPlanData = plans
             self.waitingPlanCollectionView.reloadData()
-            self.layoutConstraints()
+            self.updataPlanCollectionViewHeight()
         }
     }
     
@@ -173,6 +173,19 @@ class HomeViewController: UIViewController {
             dayPlanLabel.text = month + "월 " + day + "일의 약속"
         }
     }
+    
+    // 높이 업데이트
+    func updataPlanCollectionViewHeight() {
+        let dayPlanHeight = (dayPlanData.count - 1) * 100 + 90
+        dayPlanCollectionView.snp.updateConstraints { make in
+            make.height.equalTo(dayPlanHeight)
+        }
+        
+        let waitingPlanHeight = waitingPlanData.count * 100 - 1
+        waitingPlanCollectionView.snp.updateConstraints { make in
+            make.height.equalTo(waitingPlanHeight)
+        }
+    }
 }
 
 extension HomeViewController: UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout {
diff --git a/CoNet/Main/Meeting/MeetingMain/MeetingMainViewController.swift b/CoNet/Main/Meeting/MeetingMain/MeetingMainViewController.swift
index f73ed68..f27fc72 100644
--- a/CoNet/Main/Meeting/MeetingMain/MeetingMainViewController.swift
+++ b/CoNet/Main/Meeting/MeetingMain/MeetingMainViewController.swift
@@ -138,7 +138,11 @@ class MeetingMainViewController: UIViewController {
         format.locale = Locale(identifier: "ko_KR")
         format.timeZone = TimeZone(abbreviation: "KST")
         
-        dayPlanAPI(date: format.string(from: Date()))
+        if let selectedDate = calendarVC.selectedDate {
+            dayPlanAPI(date: selectedDate)
+        } else {
+            dayPlanAPI(date: format.string(from: Date()))
+        }
     }
     
     override func viewWillDisappear(_ animated: Bool) {
@@ -185,7 +189,7 @@ class MeetingMainViewController: UIViewController {
             self.planNum.text = String(count)
             self.dayPlanData = plans
             self.dayPlanCollectionView.reloadData()
-            self.layoutContraints()
+            self.updataPlanCollectionViewHeight()
         }
     }
     
@@ -312,6 +316,13 @@ class MeetingMainViewController: UIViewController {
         
         present(getMemberBottomSheet, animated: true, completion: nil)
     }
+    
+    func updataPlanCollectionViewHeight() {
+        let dayPlanHeight = dayPlanData.count * 80 - 1
+        dayPlanCollectionView.snp.updateConstraints { make in
+            make.height.equalTo(dayPlanHeight)
+        }
+    }
 }
 
 // 사이드바 화면 전환