chore: update and use multiplatform datetime

shared/src/commonMain/kotlin/bou/amine/apps/readerforselfossv2/repository/RepositoryImpl.kt

@@ -74,7 +74,7 @@ class Repository(
                 dbItems = dbItems.filter { it.sourcetitle == sourceFilter.value!!.title }
             }
             val itemsList = ArrayList(dbItems.map { it.toView() })
-            itemsList.sortByDescending { DateUtils.parseDate(it.datetime) }
+            itemsList.sortByDescending { it.datetime.toParsedDate() }
             fetchedItems =
                 StatusAndData.succes(
                     itemsList,

shared/src/commonMain/kotlin/bou/amine/apps/readerforselfossv2/utils/DateUtils.kt

@@ -1,9 +1,35 @@
 package bou.amine.apps.readerforselfossv2.utils
 
+import kotlinx.datetime.LocalDateTime
+import kotlinx.datetime.TimeZone
+import kotlinx.datetime.toInstant
+
+fun String.toParsedDate(): Long {
+    // Possible formats are
+    // yyyy-mm-dd hh:mm:ss format
+    val oldVersionFormat = "\\d{4}-\\d{2}-\\d{2} \\d{2}:\\d{2}:\\d{2}(.()\\d*)?".toRegex()
+
+    // yyyy-MM-dd'T'HH:mm:ss[.SSS]XXX (RFC3339)
+    val newVersionFormat = "(\\d{4}-\\d{2}-\\d{2}T\\d{2}:\\d{2}:\\d{2})[+-](\\d{2}(:\\d{2})?)?".toRegex()
+
+    val isoDateString: String =
+        try {
+            if (this.matches(oldVersionFormat)) {
+                this.replace(" ", "T")
+            } else if (this.matches(newVersionFormat)) {
+                newVersionFormat.find(this)?.groups?.get(1)?.value ?: throw Exception("Couldn't parse $this")
+            } else {
+                throw Exception("Unrecognized format for $this")
+            }
+        } catch (e: Exception) {
+            throw Exception("parseDate failed for $this", e)
+        }
+
+    return LocalDateTime.parse(isoDateString).toInstant(TimeZone.currentSystemDefault()).toEpochMilliseconds()
+}
+
 expect class DateUtils() {
     companion object {
-        fun parseDate(dateString: String): Long
-
         fun parseRelativeDate(dateString: String): String
     }
 }