improved UI

composeApp/src/webMain/kotlin/net/sergeych/toread/BookPlatform.web.kt

@@ -3,6 +3,7 @@ package net.sergeych.toread
 import androidx.compose.ui.graphics.ImageBitmap
 import kotlinx.browser.window
 import net.sergeych.toread.fb2.Fb2Binary
+import net.sergeych.toread.storage.BookReadingStatus
 import org.w3c.dom.events.Event
 
 actual fun loadDefaultBookBytes(): ByteArray? = null
@@ -39,6 +40,8 @@ actual suspend fun loadLibraryReadingPosition(fileId: String): ReadingPosition?
 
 actual suspend fun saveLibraryReadingPosition(fileId: String, position: ReadingPosition) = Unit
 
+actual suspend fun markLibraryReadingStatus(fileId: String, status: BookReadingStatus): Boolean = false
+
 actual suspend fun loadBookInfoExtras(fileId: String): BookInfoExtras = BookInfoExtras()
 
 actual suspend fun loadActiveReadingFileId(): String? = null
@@ -62,3 +65,29 @@ actual fun watchPlatformDarkTheme(onChange: (Boolean) -> Unit): () -> Unit {
 }
 
 actual fun libraryLogPath(): String? = null
+
+actual fun formatLibraryLastReadTime(millis: Long): String {
+    val totalMinutes = millis / 60_000L
+    val minute = (totalMinutes % 60).toString().padStart(2, '0')
+    val totalHours = totalMinutes / 60
+    val hour = (totalHours % 24).toString().padStart(2, '0')
+    val (yearValue, monthValue, dayValue) = civilDateFromEpochDay(totalHours / 24)
+    val year = yearValue.toString()
+    val month = monthValue.toString().padStart(2, '0')
+    val day = dayValue.toString().padStart(2, '0')
+    return "$year-$month-$day $hour:$minute"
+}
+
+private fun civilDateFromEpochDay(epochDay: Long): Triple<Int, Int, Int> {
+    val shiftedDay = epochDay + 719_468
+    val era = shiftedDay / 146_097
+    val dayOfEra = shiftedDay - era * 146_097
+    val yearOfEra = (dayOfEra - dayOfEra / 1_460 + dayOfEra / 36_524 - dayOfEra / 146_096) / 365
+    var year = (yearOfEra + era * 400).toInt()
+    val dayOfYear = dayOfEra - (365 * yearOfEra + yearOfEra / 4 - yearOfEra / 100)
+    val monthPart = (5 * dayOfYear + 2) / 153
+    val day = (dayOfYear - (153 * monthPart + 2) / 5 + 1).toInt()
+    val month = (monthPart + if (monthPart < 10) 3 else -9).toInt()
+    if (month <= 2) year += 1
+    return Triple(year, month, day)
+}