refactor to ES modules

js/day.js

@@ -0,0 +1,26 @@
+export default class Day {
+  static date = new Date() // maybe easier to offset time zone later
+
+  static update() {
+    Day.date = new Date()
+  }
+
+  static get today() {
+    return Day.date.getDay()
+  }
+
+  static get tomorrow() {
+    let day = Day.today + 1
+    if (day > 6) day -= 6
+
+    return day
+  }
+
+  static get secondsUntilFullMinute() {
+    return (60 - Day.date.getSeconds()).toString().padStart(2, '0')
+  }
+ 
+  static get minutesPassedSinceMidnight() {
+    return Day.date.getHours() * 60 + Day.date.getMinutes()
+  }
+}