docs: recommend 24-hour format for English schedules

Add test confirming 24-hour format support (e.g., "every day at 16:00").
Update docs to prefer 24-hour format over ambiguous 12-hour am/pm.

Author: aster-void

README.md

@@ -266,9 +266,16 @@ Full form:
 **Size**: `512K`, `10M`, `1G`, or bytes
 
 **Schedule**: Cron or English phrase
+
 - Cron: `min hour day month weekday` (e.g., `*/5 * * * *` = every 5 minutes)
-- English: `every 5 minutes`, `every day at 4:00 pm`, `7pm every Thursday`, `Sunday at 12:00`, `midnight on Tuesdays`
-- Note: `12 am` = midnight (00:00), `12 pm` = noon (12:00)
+- English examples:
+  - `every 5 minutes`
+  - `every day at 16:00`
+  - `7pm every Thursday`
+  - `Sunday at 12:00`
+  - `midnight on Tuesdays`
+- 24-hour format preferred
+- 12-hour edge case: `12 am` = midnight (00:00), `12 pm` = noon (12:00)
 
 ### Environment variable priority
 

src/actor/job/tick.rs

@@ -178,6 +178,14 @@ mod tests {
         assert_eq!(next, Utc.with_ymd_and_hms(2025, 1, 15, 12, 0, 0).unwrap());
     }
 
+    #[test]
+    fn english_24h_format() {
+        let schedule = parse_schedule("every day at 16:00");
+        let now = Utc.with_ymd_and_hms(2025, 1, 15, 10, 0, 0).unwrap();
+        let next = schedule_next_from(&schedule, UTC, now).unwrap();
+        assert_eq!(next, Utc.with_ymd_and_hms(2025, 1, 15, 16, 0, 0).unwrap());
+    }
+
     #[test]
     fn english_7pm_every_thursday() {
         let schedule = parse_schedule("7pm every Thursday");