Fix relative date display (#3696)

* Fix relative date display

DatePeriod.days provides the number of days in the DatePeriod specifically, not the total number.
LocalDate.daysUntil provides what we were looking for.

* Add Changelog

CHANGELOG.md

@@ -11,6 +11,8 @@ The format is a modified version of [Keep a Changelog](https://keepachangelog.co
 - `Other` - for technical stuff.
 
 ## [Unreleased]
+### Fixed
+- Fixed some dates being wrongly shown as "Today" or otherwise closer in time ([@MajorTanya](https://github.com/MajorTanya)) ([#3696](https://github.com/mihonapp/mihon/pull/3696))
 
 ## [v0.20.3] - 2026-08-04
 ### Added

app/src/main/java/eu/kanade/tachiyomi/util/lang/DateExtensions.kt

@@ -4,7 +4,7 @@ import android.content.Context
 import kotlinx.datetime.LocalDate
 import kotlinx.datetime.LocalDateTime
 import kotlinx.datetime.TimeZone
-import kotlinx.datetime.minus
+import kotlinx.datetime.daysUntil
 import kotlinx.datetime.toInstant
 import kotlinx.datetime.toJavaLocalDate
 import kotlinx.datetime.toJavaLocalDateTime
@@ -58,7 +58,7 @@ fun LocalDate.toRelativeString(
         return dateFormat.format(this.toJavaLocalDate())
     }
     val today = Clock.System.now().toLocalDateTime(TimeZone.currentSystemDefault()).date
-    val difference = (today - this).days
+    val difference = this.daysUntil(today)
     return when {
         difference < -7 -> dateFormat.format(this.toJavaLocalDate())
         difference < 0 -> context.pluralStringResource(