Train status now properly gives minutes (or hours) a train is early or late

- Convert AmtrakDateFormatting API from static to instance properties/methods and added parsedDate(from:) to return Date.
- Update time(from:) and date(from:) to instance methods. Improve isOnTime logic to compute actual vs scheduled differences (minutes/hours) and report early/late/on-time.
- Updated ContentView to create an AmtrakDateFormatting instance and use the new API. Remove the Train.serviceDate extension.

Sources/AmtrakStatus/AmtrakDateFormatting.swift

@@ -1,23 +1,32 @@
 import Foundation
 
 struct AmtrakDateFormatting {
-    static let isoFormatter = ISO8601DateFormatter()
+    let isoFormatter = ISO8601DateFormatter()
     
-    static let timeFormatter: DateFormatter = {
+    let timeFormatter: DateFormatter = {
         let formatter = DateFormatter()
         formatter.dateStyle = .none
         formatter.timeStyle = .short
         return formatter
     }()
     
-    static let dateFormatter: DateFormatter = {
+    let dateFormatter: DateFormatter = {
         let formatter = DateFormatter()
         formatter.dateStyle = .medium
         formatter.timeStyle = .none
         return formatter
     }()
     
-    static func time(from isoString: String?) -> String? {
+    func parsedDate(from isoString: String?) -> Date? {
+        guard let isoString, !isoString.isEmpty, let date = isoFormatter.date(
+            from: isoString) else {
+            return nil
+        }
+        
+        return isoFormatter.date(from: isoString)
+    }
+    
+    func time(from isoString: String?) -> String? {
         guard let isoString, !isoString.isEmpty, let date = isoFormatter.date(
             from: isoString) else {
             return nil
@@ -26,7 +35,7 @@ struct AmtrakDateFormatting {
         return timeFormatter.string(from: date)
     }
     
-    static func date(from isoString: String?) -> String? {
+    func date(from isoString: String?) -> String? {
         guard let isoString, !isoString.isEmpty, let date = isoFormatter.date(
             from: isoString) else {
             return nil

Sources/AmtrakStatus/ContentView.swift

@@ -1,11 +1,6 @@
 import SwiftCrossUI
 import Foundation
 
-extension Train {
-    var serviceDate: String {
-        AmtrakDateFormatting.date(from: createdAt) ?? "-"
-    }
-}
 
 struct ContentView: View {
     @State var client = AmtrakClient()
@@ -137,23 +132,36 @@ struct ContentView: View {
     func isOnTime(arr: String?, schArr: String?) -> String {
         let amtrakDate = AmtrakDateFormatting()
         
-        if AmtrakDateFormatting
+        guard
-            .time(from: arr) != AmtrakDateFormatting
+            let actualDate = amtrakDate.parsedDate(from: arr),
-            .time(from: schArr) {
+            let scheduledDate = amtrakDate.parsedDate(from: schArr)
-            return "Late"
+        else {
+            return "On Time"
         }
         
-        return "On Time"
+        let differenceInMinutes = Int(actualDate.timeIntervalSince(scheduledDate) / 60)
+        
+        switch differenceInMinutes {
+        case -1...1:
+            return "On Time"
+        case ..<0:
+            return "\(-differenceInMinutes) min early"
+        case 0..<60:
+            return "\(differenceInMinutes) min late"
+        default:
+            let hours = differenceInMinutes / 60
+            return "\(hours) hr late"
+        }
     }
     
     func trainStatus(for train: Train, atStationCode code: String) -> TrainStatusRow {
         let leg = train.stations?.first { $0.code == code }
-        let platform = leg?.platform ?? "-"
+        let amtrakDate = AmtrakDateFormatting()
         let stationName = leg?.name ?? unknown
-        let arrival = AmtrakDateFormatting.time(from: leg?.arr) ?? AmtrakDateFormatting.time(
+        let arrival = amtrakDate.time(from: leg?.arr) ?? amtrakDate.time(
             from: leg?.schArr
         )
-        let depature = AmtrakDateFormatting.time(from: leg?.dep) ?? AmtrakDateFormatting.time(
+        let depature = amtrakDate.time(from: leg?.dep) ?? amtrakDate.time(
             from: leg?.schDep
         )