AK: Calculate elapsed days in human_readable_time()

Author: https://github.com/krkk
Commit: https://github.com/SerenityOS/serenity/commit/25fa485dfb
Pull-request: https://github.com/SerenityOS/serenity/pull/16568
Reviewed-by: https://github.com/AtkinsSJ ✅

AK/NumberFormat.h

@@ -44,6 +44,9 @@ static inline DeprecatedString human_readable_size_long(u64 size)
 
 static inline DeprecatedString human_readable_time(i64 time_in_seconds)
 {
+    auto days = time_in_seconds / 86400;
+    time_in_seconds = time_in_seconds % 86400;
+
     auto hours = time_in_seconds / 3600;
     time_in_seconds = time_in_seconds % 3600;
 
@@ -52,6 +55,9 @@ static inline DeprecatedString human_readable_time(i64 time_in_seconds)
 
     StringBuilder builder;
 
+    if (days > 0)
+        builder.appendff("{} day{} ", days, days == 1 ? "" : "s");
+
     if (hours > 0)
         builder.appendff("{} hour{} ", hours, hours == 1 ? "" : "s");