find/time: calculate midnight with local time zone

src/find/matchers/time.rs

@@ -9,6 +9,8 @@ use std::fs::{self, Metadata};
 use std::io::{stderr, Write};
 use std::time::{Duration, SystemTime, UNIX_EPOCH};
 
+use chrono::{DateTime, Local};
+
 #[cfg(unix)]
 use std::os::unix::fs::MetadataExt;
 
@@ -19,10 +21,14 @@ const SECONDS_PER_DAY: i64 = 60 * 60 * 24;
 fn get_time(matcher_io: &mut MatcherIO, today_start: bool) -> SystemTime {
     if today_start {
         // the time at 00:00:00 of today
-        let duration = matcher_io.now().duration_since(UNIX_EPOCH).unwrap();
-        let seconds = duration.as_secs();
-        let midnight_seconds = seconds - (seconds % 86400);
-        UNIX_EPOCH + Duration::from_secs(midnight_seconds)
+        let duration_since_unix_epoch = matcher_io.now().duration_since(UNIX_EPOCH).unwrap();
+        let seconds_since_unix_epoch = duration_since_unix_epoch.as_secs();
+        let utc_time = DateTime::from_timestamp(seconds_since_unix_epoch as i64, 0).unwrap();
+        let local_time = utc_time.with_timezone(&Local);
+        let local_midnight = local_time.date().and_hms(0, 0, 0);
+        let local_midnight_seconds = local_midnight.timestamp();
+
+        UNIX_EPOCH + Duration::from_secs(local_midnight_seconds as u64)
     } else {
         matcher_io.now()
     }