diff --git a/app/components/ScheduleView/ScheduleDate.tsx b/app/components/ScheduleView/ScheduleDate.tsx
index 38e3f71..25b06ca 100644
--- a/app/components/ScheduleView/ScheduleDate.tsx
+++ b/app/components/ScheduleView/ScheduleDate.tsx
@@ -21,8 +21,9 @@ interface ScheduleDateState {
 export default class ScheduleDate extends React.Component<ScheduleDateProps, ScheduleDateState> {
     static getDerivedStateFromProps(props: ScheduleDateProps, state: ScheduleDateState): Partial<ScheduleDateState> {
         if (!DateOfYear.equals(props.date, state.lastDate)) {
+            const thisYear = moment().year();
             const rawValue = props.date == null ? "" :
-                moment(props.date).format(HTML_DATE_INPUT_FORMAT);
+                moment(props.date).year(thisYear).format(HTML_DATE_INPUT_FORMAT);
             return { lastDate: props.date, rawValue };
         }
         return {};
@@ -44,10 +45,11 @@ export default class ScheduleDate extends React.Component<ScheduleDateProps, Sch
             }
             dayNode = <Input type="date" icon={clearIcon} value={this.state.rawValue} onChange={this.onChange} />;
         } else {
+            const m = moment(date || "");
             let dayString: string;
-            if (date) {
-                const format = (date.year === 0) ? "M/D" : "l";
-                dayString = moment(date).format(format);
+            if (m.isValid()) {
+                const format = (m.year() === 0) ? "M/D" : "l";
+                dayString = m.format(format);
             } else {
                 dayString = "N/A";
             }
@@ -68,7 +70,7 @@ export default class ScheduleDate extends React.Component<ScheduleDateProps, Sch
         const { onChange } = this.props;
         if (!onChange) return;
         const m = moment(data.value, HTML_DATE_INPUT_FORMAT);
-        onChange(DateOfYear.fromMoment(m));
+        onChange(DateOfYear.fromMoment(m).with({ year: 0 }));
     }
 
     private onClear = () => {
diff --git a/app/pages/ProgramPage.tsx b/app/pages/ProgramPage.tsx
index 223aff3..4b4b493 100644
--- a/app/pages/ProgramPage.tsx
+++ b/app/pages/ProgramPage.tsx
@@ -113,8 +113,7 @@ class ProgramPage extends React.Component<ProgramPageProps> {
             if (this.programView == null && this.program) {
                 // this.programView = createViewModel(this.program);
                 // this.programView = observable(toJS(this.program));
-                this.programView = new Program(this.program.device, this.program.id);
-                merge(this.programView, this.program);
+                this.programView = this.program.clone();
             }
         } else {
             if (this.programView != null) {
diff --git a/common/sprinklersRpc/Program.ts b/common/sprinklersRpc/Program.ts
index 85c1273..1b32b69 100644
--- a/common/sprinklersRpc/Program.ts
+++ b/common/sprinklersRpc/Program.ts
@@ -28,9 +28,12 @@ export class Program {
     @observable.shallow sequence: ProgramItem[] = [];
     @observable running: boolean = false;
 
-    constructor(device: SprinklersDevice, id: number) {
+    constructor(device: SprinklersDevice, id: number, data?: Partial<Program>) {
         this.device = device;
         this.id = id;
+        if (data) {
+            Object.assign(this, data);
+        }
     }
 
     run() {
@@ -46,8 +49,16 @@ export class Program {
         return this.device.updateProgram({ programId: this.id, data });
     }
 
+    clone(): Program {
+        return new Program(this.device, this.id, {
+            name: this.name, enabled: this.enabled, running: this.running,
+            schedule: this.schedule.clone(),
+            sequence: this.sequence.slice(),
+        });
+    }
+
     toString(): string {
         return `Program{name="${this.name}", enabled=${this.enabled}, schedule=${this.schedule}, ` +
-         `sequence=${this.sequence}, running=${this.running}}`;
+            `sequence=${this.sequence}, running=${this.running}}`;
     }
 }
diff --git a/common/sprinklersRpc/schedule.ts b/common/sprinklersRpc/schedule.ts
index 09d8ba2..1bdc1a6 100644
--- a/common/sprinklersRpc/schedule.ts
+++ b/common/sprinklersRpc/schedule.ts
@@ -54,6 +54,8 @@ export enum Month {
 }
 
 export class DateOfYear {
+    static readonly DEFAULT = new DateOfYear({ day: 1, month: Month.January, year: 0 });
+
     static equals(a: DateOfYear | null | undefined, b: DateOfYear | null | undefined): boolean {
         return (a === b) || ((a instanceof DateOfYear && b instanceof DateOfYear) &&
             a.day === b.day &&
@@ -62,17 +64,19 @@ export class DateOfYear {
     }
 
     static fromMoment(m: Moment): DateOfYear {
-        return new DateOfYear(m.date(), m.month(), m.year());
+        return new DateOfYear({ day: m.date(), month: m.month(), year: m.year() });
     }
 
-    readonly day: number;
-    readonly month: Month;
-    readonly year: number;
+    readonly day!: number;
+    readonly month!: Month;
+    readonly year!: number;
+
+    constructor(data?: Partial<DateOfYear>) {
+        Object.assign(this, DateOfYear.DEFAULT, data);
+    }
 
-    constructor(day: number = 0, month: Month = Month.January, year: number = 0) {
-        this.day = day;
-        this.month = month;
-        this.year = year;
+    with(data: Partial<DateOfYear>): DateOfYear {
+        return new DateOfYear(Object.assign({}, this, data));
     }
 
     toString() {
@@ -85,4 +89,14 @@ export class Schedule {
     @observable weekdays: Weekday[] = [];
     @observable from: DateOfYear | null = null;
     @observable to: DateOfYear | null = null;
+
+    constructor(data?: Partial<Schedule>) {
+        if (typeof data === "object") {
+            Object.assign(this, data);
+        }
+    }
+
+    clone(): Schedule {
+        return new Schedule(this);
+    }
 }