diff --git a/htmlui/src/NewSnapshot.js b/htmlui/src/NewSnapshot.js
index 10539c5a7..15179b03b 100644
--- a/htmlui/src/NewSnapshot.js
+++ b/htmlui/src/NewSnapshot.js
@@ -69,23 +69,27 @@ export class NewSnapshot extends Component {
             return;
         }
 
-        let req = {
-            root: this.state.resolvedSource.path,
-            maxExamplesPerBucket: 10,
-            policyOverride: pe.state.policy,
-        }
+        try {
+            let req = {
+                root: this.state.resolvedSource.path,
+                maxExamplesPerBucket: 10,
+                policyOverride: pe.getAndValidatePolicy(),
+            }
 
-        axios.post('/api/v1/estimate', req).then(result => {
-            this.setState({
-                lastEstimatedPath: this.state.resolvedSource.path,
-                estimateTaskID: result.data.id,
-                estimatingPath: result.data.description,
-                estimateTaskVisible: true,
-                didEstimate: false,
-            })
-        }).catch(error => {
-            errorAlert(error);
-        });
+            axios.post('/api/v1/estimate', req).then(result => {
+                this.setState({
+                    lastEstimatedPath: this.state.resolvedSource.path,
+                    estimateTaskID: result.data.id,
+                    estimatingPath: result.data.description,
+                    estimateTaskVisible: true,
+                    didEstimate: false,
+                })
+            }).catch(error => {
+                errorAlert(error);
+            });
+        } catch (e) {
+            errorAlert(e);
+        }
     }
 
     snapshotNow(e) {
@@ -101,20 +105,24 @@ export class NewSnapshot extends Component {
             return;
         }
 
-        axios.post('/api/v1/sources', {
-            path: this.state.resolvedSource.path,
-            createSnapshot: true,
-            policy: pe.state.policy,
-        }).then(result => {
-            this.props.history.goBack();
-        }).catch(error => {
-            errorAlert(error);
+        try {
+            axios.post('/api/v1/sources', {
+                path: this.state.resolvedSource.path,
+                createSnapshot: true,
+                policy: pe.getAndValidatePolicy(),
+            }).then(result => {
+                this.props.history.goBack();
+            }).catch(error => {
+                errorAlert(error);
 
-            this.setState({
-                error,
-                isLoading: false
+                this.setState({
+                    error,
+                    isLoading: false
+                });
             });
-        });
+        } catch (e) {
+            errorAlert(e);
+        }
     }
 
     render() {
diff --git a/htmlui/src/PolicyEditor.js b/htmlui/src/PolicyEditor.js
index 95a9d2905..e7289f990 100644
--- a/htmlui/src/PolicyEditor.js
+++ b/htmlui/src/PolicyEditor.js
@@ -9,7 +9,7 @@ import Form from 'react-bootstrap/Form';
 import Row from 'react-bootstrap/Row';
 import Spinner from 'react-bootstrap/Spinner';
 import Accordion from 'react-bootstrap/Accordion';
-import { handleChange, LogDetailSelector, OptionalBoolean, OptionalNumberField, RequiredBoolean, stateProperty, StringList, valueToNumber } from './forms';
+import { handleChange, LogDetailSelector, OptionalBoolean, OptionalNumberField, RequiredBoolean, stateProperty, StringList, TimesOfDayList, valueToNumber } from './forms';
 import { errorAlert, PolicyEditorLink, sourceQueryStringParams } from './uiutil';
 import { getDeepStateProperty } from './deepstate';
 
@@ -95,7 +95,7 @@ function UpcomingSnapshotTimes(times) {
         <LabelColumn name-="Upcoming" />
 
         <ul data-testid="upcoming-snapshot-times">
-        {times.map(x => <li key={x}>{moment(x).format('L LT')} ({moment(x).fromNow()})</li>)}
+            {times.map(x => <li key={x}>{moment(x).format('L LT')} ({moment(x).fromNow()})</li>)}
         </ul>
     </>;
 }
@@ -125,6 +125,7 @@ export class PolicyEditor extends Component {
         this.policyURL = this.policyURL.bind(this);
         this.resolvePolicy = this.resolvePolicy.bind(this);
         this.PolicyDefinitionPoint = this.PolicyDefinitionPoint.bind(this);
+        this.getAndValidatePolicy = this.getAndValidatePolicy.bind(this);
     }
 
     componentDidMount() {
@@ -174,13 +175,17 @@ export class PolicyEditor extends Component {
     resolvePolicy(props) {
         const u = '/api/v1/policy/resolve?' + sourceQueryStringParams(props);
 
-        axios.post(u, { 
-            "updates": this.state.policy,
-             "numUpcomingSnapshotTimes": 5,
-         }).then(result => {
-            this.setState({ resolved: result.data });
-        }).catch(error => {
-        });
+        try {
+            axios.post(u, {
+                "updates": this.getAndValidatePolicy(),
+                "numUpcomingSnapshotTimes": 5,
+            }).then(result => {
+                this.setState({ resolved: result.data });
+            }).catch(error => {
+            });
+        }
+        catch (e) {
+        }
     }
 
     PolicyDefinitionPoint(p) {
@@ -195,9 +200,7 @@ export class PolicyEditor extends Component {
         return <>Defined by {PolicyEditorLink(p)}</>;
     }
 
-    saveChanges(e) {
-        e.preventDefault()
-
+    getAndValidatePolicy() {
         function removeEmpty(l) {
             if (!l) {
                 return l;
@@ -216,7 +219,18 @@ export class PolicyEditor extends Component {
             return result;
         }
 
-        // clean up policy before saving
+        function validateTimesOfDay(l) {
+            for (const tod of l) {
+                if (!tod.hour) {
+                    // unparsed
+                    throw Error("invalid time of day: '" + tod + "'")
+                }
+            }
+
+            return l;
+        }
+
+        // clone and clean up policy before saving
         let policy = JSON.parse(JSON.stringify(this.state.policy));
         if (policy.files) {
             if (policy.files.ignore) {
@@ -236,13 +250,32 @@ export class PolicyEditor extends Component {
             }
         }
 
-        this.setState({ saving: true });
-        axios.put(this.policyURL(this.props), policy).then(result => {
-            this.props.close();
-        }).catch(error => {
-            this.setState({ saving: false });
-            errorAlert(error, 'Error saving policy');
-        });
+        if (policy.scheduling) {
+            if (policy.scheduling.timeOfDay) {
+                policy.scheduling.timeOfDay = validateTimesOfDay(removeEmpty(policy.scheduling.timeOfDay));
+            }
+        }
+
+        return policy;
+    }
+
+    saveChanges(e) {
+        e.preventDefault()
+
+        try {
+            const policy = this.getAndValidatePolicy();
+
+            this.setState({ saving: true });
+            axios.put(this.policyURL(this.props), policy).then(result => {
+                this.props.close();
+            }).catch(error => {
+                this.setState({ saving: false });
+                errorAlert(error, 'Error saving policy');
+            });
+        } catch (e) {
+            errorAlert(e);
+            return
+        }
     }
 
     deletePolicy() {
@@ -439,6 +472,13 @@ export class PolicyEditor extends Component {
                                 </WideValueColumn>
                                 {EffectiveValue(this, "scheduling.intervalSeconds")}
                             </Row>
+                            <Row>
+                                <LabelColumn name="Times Of Day" help="Create snapshots at the provided times of day, one per line, 24h time (e.g. 17:00,18:00)" />
+                                <ValueColumn>
+                                    {TimesOfDayList(this, "policy.scheduling.timeOfDay")}
+                                </ValueColumn>
+                                {EffectiveBooleanValue(this, "scheduling.manual")}
+                            </Row>
                             <Row>
                                 <LabelColumn name="Manual Snapshots Only" help="Only create snapshots manually (disables scheduled snapshots)." />
                                 <ValueColumn>
diff --git a/htmlui/src/forms.js b/htmlui/src/forms.js
index 16498edbd..1c99177c2 100644
--- a/htmlui/src/forms.js
+++ b/htmlui/src/forms.js
@@ -214,14 +214,67 @@ export function StringList(component, name) {
     </Form.Group>
 }
 
-export function TimesOfDayList(component, name, tempName) {
+export function TimesOfDayList(component, name) {
+    function parseTimeOfDay(v) {
+        var re = /(\d+):(\d+)/;
+
+        const match = re.exec(v);
+        if (match) {
+            const h = parseInt(match[1]);
+            const m = parseInt(match[2]);
+            let valid = (h < 24 && m < 60);
+
+            if (m < 10 && match[2].length === 1) {
+                valid = false;
+            }
+
+            if (valid) {
+                return {hour: h, min: m}
+            }
+        }
+
+        return v;
+    }
+
+    function toMultilineString(v) {
+        if (v) {
+            let tmp = [];
+
+            for (const tod of v) {
+                if (tod.hour) {
+                    tmp.push(tod.hour + ":" + (tod.min < 10 ? "0": "") + tod.min);
+                } else {
+                    tmp.push(tod);
+                }
+            }
+
+            return tmp.join("\n");
+        }
+    
+        return "";
+    }
+    
+    function fromMultilineString(target) {
+        const v = target.value;
+        if (v === "") {
+            return undefined;
+        }
+
+        let result = [];
+    
+        for (const line of v.split(/\n/)) {
+            result.push(parseTimeOfDay(line));
+        };
+
+        return result;
+    }
+    
     return <FormGroup>
         <Form.Control
             size="sm"
             name={name}
-            isInvalid={true}
-            value={listToMultilineString(stateProperty(component, name))}
-            onChange={e => component.handleChange(e, multilineStringToList)}
+            value={toMultilineString(stateProperty(component, name))}
+            onChange={e => component.handleChange(e, fromMultilineString)}
             as="textarea"
             rows="5">
         </Form.Control>
diff --git a/htmlui/src/uiutil.js b/htmlui/src/uiutil.js
index b96652223..629d27356 100644
--- a/htmlui/src/uiutil.js
+++ b/htmlui/src/uiutil.js
@@ -224,6 +224,8 @@ export function errorAlert(err, prefix) {
     
     if (err.response && err.response.data && err.response.data.error) {
         alert(prefix + err.response.data.error);
+    } else if (err instanceof Error) {
+        alert(err);
     } else {
         alert(prefix + JSON.stringify(err));
     }