refactored code to encapsulate date formatting

lib/services/date_utility.dart

@@ -0,0 +1,36 @@
+import 'package:timezone/timezone.dart' as tz;
+import 'package:intl/intl.dart' as intl;
+
+class DateUtility {
+  static final intl.DateFormat _hmFormat = intl.DateFormat('Hm');
+  static final intl.DateFormat _ymdhmFormat = intl.DateFormat('yyyy-MM-dd H:m');
+  static final intl.DateFormat _ymdFormat = intl.DateFormat('yyyy-MM-dd');
+
+  // private default contructor so class can't be instanciated
+  DateUtility._();
+
+  static DateTime get currentUKTimeUtc {
+    final london = tz.getLocation('Europe/London');
+    return tz.TZDateTime.now(london).toUtc();
+  }
+
+  /// Formats a date in minutesSinceEpoch to a formatted String of HH:mm
+  static String formatMinutesToHm(double value) {
+    return _hmFormat.format(
+        DateTime.fromMillisecondsSinceEpoch((value * 1000 * 60).toInt()));
+  }
+
+  static String formatDateToHm(DateTime date) {
+    return _hmFormat.format(date);
+  }
+
+  /// Formats a date to yyyy-MM-dd H:m
+  static String formatDateToYmdhm(DateTime date) {
+    return _ymdhmFormat.format(date);
+  }
+
+  /// Formats a date to yyyy-MM-dd
+  static String formatDateToYmd(DateTime date) {
+    return _ymdFormat.format(date);
+  }
+}