initial commit (migrated)

lib/core/time.dart

@@ -0,0 +1,13 @@
+/// Humble class for time related operations.
+abstract class Time {
+  /// Get unix timestamp in seconds.
+  int getUnixTimestamp();
+}
+
+/// Implementation of [Time] using [DateTime].
+class TimeImpl implements Time {
+  @override
+  int getUnixTimestamp() {
+    return DateTime.now().millisecondsSinceEpoch ~/ 1000;
+  }
+}