date: remove set_to property from Settings

src/uu/date/src/date.rs

@@ -35,10 +35,10 @@
 
 /// OHOS helper: pass through the system time zone ID returned by
 /// TimeService (OH_TimeService_GetTimeZone, e.g. "Asia/Shanghai") and
 /// resolve it against the embedded IANA tzdata (jiff-tzdb) so that
 /// historial DST rules and transitions are preserved. jiff's
 /// `try_system()` is useless on OHOS because both `/etc/localtime` and
 /// the zoneinfo dirs are absent.
 #[cfg(target_env = "ohos")]
 fn ohos_system_zone() -> jiff::tz::TimeZone {
     use core::ffi::{CStr, c_char};
@@ -55,7 +55,7 @@
     let id = unsafe { CStr::from_ptr(buf.as_ptr() as *const c_char) }
         .to_string_lossy()
         .into_owned();
     if let Some((name, tzif)) = jiff_tzdb::get(&id) {
         if let Ok(tz) = jiff::tz::TimeZone::tzif(name, tzif) {
             return tz;
         }
@@ -116,7 +116,6 @@
     utc: bool,
     format: Format,
     date_source: DateSource,
-    set_to: Option<Zoned>,
     debug: bool,
 }
 
@@ -424,30 +423,26 @@
         }
     };
 
-    let set_to = match matches.get_one::<String>(OPT_SET) {
-        None => None,
-        Some(input) => match parse_date(input, &now, DebugOptions::new(debug_mode, true), false) {
-            Ok(ParsedDateTime::InRange(date)) => Some(date),
+    if let Some(input) = matches.get_one::<String>(OPT_SET) {
+        match parse_date(input, &now, DebugOptions::new(debug_mode, true), false) {
+            Ok(ParsedDateTime::InRange(date)) => {
+                return set_system_datetime(convert_for_set(date, utc));
+            }
             Ok(ParsedDateTime::Extended(_)) | Err(_) => {
                 return Err(Box::new(DateError::InvalidDate {
                     date: input.clone(),
                 }));
             }
-        },
-    };
+        }
+    }
 
     let settings = Settings {
         utc,
         format,
         date_source,
-        set_to,
         debug: debug_mode,
     };
 
-    if let Some(date) = settings.set_to {
-        return set_system_datetime(convert_for_set(date, settings.utc));
-    }
-
     let allow_extended = matches!(settings.format, Format::Default);
     let output_time_zone = now.time_zone().clone();