[Air][AIR-58] Chats history panel

GitOrigin-RevId: 041899a9ddd2be18c514d888af433af6e8dbad9d

fleet/util/core/src/fleet/util/DateUtil.kt

@@ -3,6 +3,7 @@ package fleet.util
 
 import java.time.*
 import java.time.format.DateTimeFormatter
+import kotlin.time.toKotlinDuration
 
 private val TIME_FORMATTER = DateTimeFormatter.ofPattern("HH:mm")
 private val DATE_FORMATTER = DateTimeFormatter.ofPattern("MMM d")
@@ -32,4 +33,28 @@ fun LocalDateTime.formatTimestamp(shorten: Boolean): String {
     return DATE_WITH_YEAR_FORMATTER.format(ldt)
   }
   return FULL_FORMATTER.format(ldt)
-}
+}
+
+
+fun prettyDate(time: Long): String {
+  val ldt = utcSeconds(time / 1000)
+  val now = OffsetDateTime.now()
+
+  val dif = Duration.between(ldt, now).toKotlinDuration()
+  return when {
+    dif.inWholeSeconds < 60 -> "Now"
+    dif.inWholeMinutes < 60 -> "${dif.inWholeMinutes} min ago"
+    dif.inWholeHours == 1L -> "1 hour ago"
+    dif.inWholeHours < 10 -> "${dif.inWholeHours} hours ago"
+    dif.inWholeDays == 0L && ldt.dayOfYear == now.dayOfYear -> "Today"
+    dif.inWholeDays < 365 -> {
+      val month = ldt.month.name.lowercase().replaceFirstChar { it.uppercase() }.substring(0, 3)
+      val day = ldt.dayOfMonth.toString().padStart(2, '0')
+      "${month} ${day}"
+    }
+    else -> {
+      val years = now.year - ldt.year
+      "$years year${if (years > 1) "s" else ""} ago"
+    }
+  }
+}