diff --git a/back/store.go b/back/store.go
index 5df6586..7a89be4 100644
--- a/back/store.go
+++ b/back/store.go
@@ -5,10 +5,10 @@ import (
 	"errors"
 	"log"
 	"os"
-	"time"
 
 	"crawshaw.io/sqlite"
 	"crawshaw.io/sqlite/sqlitex"
+	"github.com/rickb777/date"
 )
 
 type GenString func(length int) (string, error)
@@ -118,9 +118,9 @@ func (s *Store) createSchema() error {
 }
 
 type CreateEventCommand struct {
-	Name                     string
-	Description              string
-	EarliestDate, LatestDate time.Time
+	Name             string
+	Description      string
+	Earliest, Latest date.Date
 }
 
 type CreateEventResult struct {
@@ -154,8 +154,8 @@ func (s *Store) CreateEvent(ctx context.Context, cmd CreateEventCommand) (result
 		adminCode,
 		cmd.Name,
 		cmd.Description,
-		cmd.EarliestDate.Format(dbDateLayout),
-		cmd.LatestDate.Format(dbDateLayout),
+		cmd.Earliest.Format(dbDateLayout),
+		cmd.Latest.Format(dbDateLayout),
 	)
 	if err != nil {
 		return
@@ -171,9 +171,9 @@ type GetEventMetadataQuery struct {
 }
 
 type GetEventMetadataResult struct {
-	Name                     string
-	Description              string
-	EarliestDate, LatestDate time.Time
+	Name             string
+	Description      string
+	Earliest, Latest date.Date
 }
 
 func (s *Store) GetEventMetadata(ctx context.Context, query GetEventMetadataQuery) (GetEventMetadataResult, error) {
@@ -196,11 +196,11 @@ func (s *Store) GetEventMetadata(ctx context.Context, query GetEventMetadataQuer
 			latestDateString := stmt.ColumnText(3)
 
 			var err error
-			result.EarliestDate, err = time.Parse(dbDateLayout, earliestDateString)
+			result.Earliest, err = date.Parse(dbDateLayout, earliestDateString)
 			if err != nil {
 				return err
 			}
-			result.LatestDate, err = time.Parse(dbDateLayout, latestDateString)
+			result.Latest, err = date.Parse(dbDateLayout, latestDateString)
 			return err
 		}, query.AlphaID)
 	if err != nil {
@@ -242,7 +242,7 @@ func (s *Store) GetEventResponses(ctx context.Context, query GetEventResponsesQu
 
 type CreateEventResponseCommand struct {
 	EventAlphaID string
-	DateHours    map[time.Time]int
+	DateHours    map[date.Date]int
 }
 
 type CreateEventResponseResult struct {
diff --git a/back/store_test.go b/back/store_test.go
index dab1098..b299162 100644
--- a/back/store_test.go
+++ b/back/store_test.go
@@ -3,9 +3,9 @@ package back_test
 import (
 	"context"
 	"testing"
-	"time"
 
 	"github.com/matryer/is"
+	"github.com/rickb777/date"
 	"gitlab.codemonkeysoftware.net/b/henwen/back"
 )
 
@@ -23,15 +23,15 @@ func TestCreateEvent(t *testing.T) {
 	is.NoErr(err)
 	defer store.Close()
 
-	earliest := time.Date(2020, 04, 05, 0, 0, 0, 0, time.UTC)
-	latest := time.Date(2020, 04, 05, 0, 0, 0, 0, time.UTC)
+	earliest := date.New(2020, 4, 5)
+	latest := date.New(2020, 4, 5)
 	const name = "abc"
 	const description = "def"
 	createResult, err := store.CreateEvent(context.Background(), back.CreateEventCommand{
-		Name:         name,
-		Description:  description,
-		EarliestDate: earliest,
-		LatestDate:   latest,
+		Name:        name,
+		Description: description,
+		Earliest:    earliest,
+		Latest:      latest,
 	})
 	is.NoErr(err)
 
@@ -41,8 +41,8 @@ func TestCreateEvent(t *testing.T) {
 	is.NoErr(err)
 	is.Equal(metadataResult.Name, name)
 	is.Equal(metadataResult.Description, description)
-	is.True(metadataResult.EarliestDate.Equal(earliest))
-	is.True(metadataResult.LatestDate.Equal(latest))
+	is.True(metadataResult.Earliest.Equal(earliest))
+	is.True(metadataResult.Latest.Equal(latest))
 }
 
 func TestGetEventResponses(t *testing.T) {
@@ -51,10 +51,10 @@ func TestGetEventResponses(t *testing.T) {
 
 	createEvent := func(is *is.I) (eventID string) {
 		event, err := store.CreateEvent(context.Background(), back.CreateEventCommand{
-			Name: "blah",
+			Name:        "blah",
 			Description: "stuff happening",
-			EarliestDate: time.Now(),
-			LatestDate: time.Now().AddDate(0,0,1),
+			Earliest:    date.Today(),
+			Latest:      date.Today().Add(1),
 		})
 		is.NoErr(err)
 		return event.AlphaID
@@ -98,4 +98,4 @@ func TestGetEventResponses(t *testing.T) {
 
 		is.Equal(getTotalResponses(is, eventID), 1)
 	})
-}
\ No newline at end of file
+}
diff --git a/front/server.go b/front/server.go
index bfd503d..eb31c66 100644
--- a/front/server.go
+++ b/front/server.go
@@ -9,6 +9,7 @@ import (
 	"strconv"
 	"time"
 
+	"github.com/rickb777/date"
 	hm "gitlab.codemonkeysoftware.net/b/hatmill"
 	a "gitlab.codemonkeysoftware.net/b/hatmill/attribute"
 	e "gitlab.codemonkeysoftware.net/b/hatmill/element"
@@ -84,14 +85,15 @@ func disableIf(cond bool, input hm.Term) hm.Term {
 }
 
 type voteState struct {
-	name                     string
-	earliestDate, latestDate time.Time
+	name             string
+	earliest, latest date.Date
 }
 
 func voteForm(disabled bool, st voteState) hm.Term {
-	var dates []time.Time
-	for curr := st.earliestDate; curr.Before(st.latestDate.Add(time.Hour)); curr = curr.AddDate(0, 0, 1) {
-		dates = append(dates, curr)
+	dateSpan := st.latest.Sub(st.earliest)
+	var dates []date.Date
+	for offset := date.PeriodOfDays(0); offset <= dateSpan; offset++ {
+		dates = append(dates, st.earliest.Add(offset))
 	}
 
 	var ths = hm.Terms{e.Th()()}
@@ -133,8 +135,8 @@ func (h *handler) handleVote(w http.ResponseWriter, r *http.Request) {
 	}
 
 	state := voteState{
-		earliestDate: event.EarliestDate,
-		latestDate:   event.LatestDate,
+		earliest: event.Earliest,
+		latest:   event.Latest,
 	}
 	body := hm.Terms{
 		e.P()(hm.Text(event.Description)),
@@ -148,9 +150,9 @@ func (h *handler) handleDoVote(w http.ResponseWriter, r *http.Request) {
 
 	// TODO Use actual data.
 	state := voteState{
-		name:         "Suzie Q",
-		earliestDate: time.Date(2006, time.May, 3, 0, 0, 0, 0, time.UTC),
-		latestDate:   time.Date(2006, time.May, 8, 0, 0, 0, 0, time.UTC),
+		name:     "Suzie Q",
+		earliest: date.New(2006, time.May, 3),
+		latest:   date.New(2006, time.May, 8),
 	}
 	body := hm.Terms{
 		e.P()(hm.Text("At Billy's house. Bring presents. Eat cake.")),
@@ -188,12 +190,12 @@ func (h *handler) handleCreate(w http.ResponseWriter, r *http.Request) {
 
 func (h *handler) handleDoCreate(w http.ResponseWriter, r *http.Request) {
 	// TODO consider redirecting to admin
-	earliest, err := time.Parse(formDateLayout, r.FormValue(fieldNameEarliest))
+	earliest, err := date.Parse(formDateLayout, r.FormValue(fieldNameEarliest))
 	if err != nil {
 		fmt.Fprint(w, "bad earliest date")
 		return
 	}
-	latest, err := time.Parse(formDateLayout, r.FormValue(fieldNameLatest))
+	latest, err := date.Parse(formDateLayout, r.FormValue(fieldNameLatest))
 	if err != nil {
 		fmt.Fprint(w, "bad latest date")
 		return
@@ -206,10 +208,10 @@ func (h *handler) handleDoCreate(w http.ResponseWriter, r *http.Request) {
 	description := r.FormValue(fieldNameDescription)
 
 	event, err := h.store.CreateEvent(context.Background(), back.CreateEventCommand{
-		Name:         eventName,
-		Description:  description,
-		EarliestDate: earliest,
-		LatestDate:   latest,
+		Name:        eventName,
+		Description: description,
+		Earliest:    earliest,
+		Latest:      latest,
 	})
 	if err != nil {
 		fmt.Fprint(w, err)
@@ -292,7 +294,7 @@ func (h *handler) handleAdmin(w http.ResponseWriter, r *http.Request) {
 			e.Input(
 				a.Name(fieldNameEarliest),
 				a.Type("date"),
-				a.Value(metadata.EarliestDate.Format(formDateLayout)),
+				a.Value(metadata.Earliest.Format(formDateLayout)),
 			),
 			e.Br(),
 
@@ -300,7 +302,7 @@ func (h *handler) handleAdmin(w http.ResponseWriter, r *http.Request) {
 			e.Input(
 				a.Name(fieldNameLatest),
 				a.Type("date"),
-				a.Value(metadata.LatestDate.Format(formDateLayout)),
+				a.Value(metadata.Latest.Format(formDateLayout)),
 			),
 			e.Br(),
 
diff --git a/go.mod b/go.mod
index 59d734c..2c13d3d 100644
--- a/go.mod
+++ b/go.mod
@@ -5,5 +5,6 @@ go 1.14
 require (
 	crawshaw.io/sqlite v0.2.5
 	github.com/matryer/is v1.3.0
+	github.com/rickb777/date v1.12.4
 	gitlab.codemonkeysoftware.net/b/hatmill v0.0.5
 )
diff --git a/go.sum b/go.sum
index feaf13c..fc7a738 100644
--- a/go.sum
+++ b/go.sum
@@ -4,5 +4,11 @@ crawshaw.io/sqlite v0.2.5/go.mod h1:igAO5JulrQ1DbdZdtVq48mnZUBAPOeFzer7VhDWNtW4=
 github.com/leanovate/gopter v0.2.4/go.mod h1:gNcbPWNEWRe4lm+bycKqxUYoH5uoVje5SkOJ3uoLer8=
 github.com/matryer/is v1.3.0 h1:9qiso3jaJrOe6qBRJRBt2Ldht05qDiFP9le0JOIhRSI=
 github.com/matryer/is v1.3.0/go.mod h1:2fLPjFQM9rhQ15aVEtbuwhJinnOqrmgXPNdZsdwlWXA=
+github.com/rickb777/date v1.12.4 h1:+6IzcCCS/1t17DrmnEvrznyq7nM8vPwir6/UhlyohKw=
+github.com/rickb777/date v1.12.4/go.mod h1:xP0eo/I5qmUt97yRGClHZfyLZ3ikMw6v6SU5MOGZTE0=
+github.com/rickb777/plural v1.2.0 h1:5tvEc7UBCZ7l8h/2UeybSkt/uu1DQsZFOFdNevmUhlE=
+github.com/rickb777/plural v1.2.0/go.mod h1:UdpyWFCGbo3mvK3f/PfZOAOrkjzJlYN/sD46XNWJ+Es=
 gitlab.codemonkeysoftware.net/b/hatmill v0.0.5 h1:7L70G1Qmdm7bSwH58qWY5psXOwoqcvokLhc4BPSIjWo=
 gitlab.codemonkeysoftware.net/b/hatmill v0.0.5/go.mod h1:3jggrD9qkK8kXt0d3+Kwg3zti2PfPcociz7r3oxtjWU=
+golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
+golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=