Issue GDSC-PKNU-Official#51 feat: Add mapping todo entity

app/src/main/java/com/gdsc/todo/data/entity/ToDo.kt

@@ -0,0 +1,21 @@
+package com.gdsc.todo.data.entity
+
+import android.os.Build
+import androidx.annotation.RequiresApi
+import java.time.LocalDateTime
+import java.time.ZoneOffset
+
+@RequiresApi(Build.VERSION_CODES.O)
+data class ToDo (
+    val id: Long = 0,
+    val title: String,
+    val contents: String,
+    val date: LocalDateTime = LocalDateTime.now()
+) {
+    fun to() = ToDoEntity(
+        id = id,
+        title = title,
+        contents = contents,
+        date = date.toEpochSecond(ZoneOffset.UTC)
+    )
+}

app/src/main/java/com/gdsc/todo/data/entity/ToDoEntity.kt

@@ -5,12 +5,20 @@ import androidx.annotation.RequiresApi
 import androidx.room.Entity
 import androidx.room.PrimaryKey
 import java.time.LocalDateTime
+import java.time.ZoneOffset
 
 @Entity
 @RequiresApi(Build.VERSION_CODES.O)
-data class ToDo (
+data class ToDoEntity (
     @PrimaryKey(autoGenerate = true) val id: Long = 0,
     val title: String,
     val contents: String,
-    val date: LocalDateTime = LocalDateTime.now()
-)
+    val date: Long
+) {
+    fun to() = ToDo(
+        id = id,
+        title = title,
+        contents = contents,
+        date = LocalDateTime.ofEpochSecond(date, 0, ZoneOffset.UTC)
+    )
+}