diff --git a/app.go b/app.go
index 464be37..3858719 100644
--- a/app.go
+++ b/app.go
@@ -2,10 +2,12 @@ package gomeassistant
 
 import (
 	"context"
+	"fmt"
 	"log"
 	"os"
 	"time"
 
+	"github.com/golang-module/carbon"
 	"github.com/gorilla/websocket"
 	"github.com/saml-dev/gome-assistant/internal"
 	"github.com/saml-dev/gome-assistant/internal/http"
@@ -24,9 +26,15 @@ type app struct {
 
 	schedules         pq.PriorityQueue
 	entityListeners   map[string][]entityListener
-	entityListenerIds map[int64]entityListenerCallback
+	entityListenersId int64
 }
 
+/*
+Time is a 24-hr format string with hour and minute,
+e.g. "07:00" for 7AM or "23:00" for 11PM.
+*/
+type Time string
+
 /*
 NewApp establishes the websocket connection and returns an object
 you can use to register schedules and listeners.
@@ -41,15 +49,14 @@ func NewApp(connString string) app {
 	state := NewState(httpClient)
 
 	return app{
-		conn:              conn,
-		ctx:               ctx,
-		ctxCancel:         ctxCancel,
-		httpClient:        httpClient,
-		service:           service,
-		state:             state,
-		schedules:         pq.New(),
-		entityListeners:   map[string][]entityListener{},
-		entityListenerIds: map[int64]entityListenerCallback{},
+		conn:            conn,
+		ctx:             ctx,
+		ctxCancel:       ctxCancel,
+		httpClient:      httpClient,
+		service:         service,
+		state:           state,
+		schedules:       pq.New(),
+		entityListeners: map[string][]entityListener{},
 	}
 }
 
@@ -71,10 +78,9 @@ func (a *app) RegisterSchedule(s schedule) {
 	// TODO: consider moving all time stuff to carbon?
 	now := time.Now()
 	startTime := time.Date(now.Year(), now.Month(), now.Day(), 0, 0, 0, 0, now.Location()) // start at midnight today
-
 	// apply offset if set
 	if s.offset.Minutes() > 0 {
-		startTime.Add(s.offset)
+		startTime = startTime.Add(s.offset)
 	}
 
 	// advance first scheduled time by frequency until it is in the future
@@ -88,45 +94,94 @@ func (a *app) RegisterSchedule(s schedule) {
 
 func (a *app) RegisterEntityListener(el entityListener) {
 	for _, entity := range el.entityIds {
-		id := internal.GetId()
-		subscribeTriggerMsg := subscribeMsg{
-			Id:   id,
-			Type: "subscribe_trigger",
-			Trigger: subscribeMsgTrigger{
-				Platform: "state",
-				EntityId: entity,
-			},
+		if elList, ok := a.entityListeners[entity]; ok {
+			a.entityListeners[entity] = append(elList, el)
+		} else {
+			a.entityListeners[entity] = []entityListener{el}
 		}
-		if el.fromState != "" {
-			subscribeTriggerMsg.Trigger.From = el.fromState
+	}
+}
+
+// Sunrise take an optional string that is passed to time.ParseDuration.
+// Examples include "-1.5h", "30m", etc. See https://pkg.go.dev/time#ParseDuration
+// for full list.
+func (a *app) Sunrise(offset ...string) Time {
+	return getSunriseSunset(a, true, offset)
+}
+
+// Sunset take an optional string that is passed to time.ParseDuration.
+// Examples include "-1.5h", "30m", etc. See https://pkg.go.dev/time#ParseDuration
+// for full list.
+func (a *app) Sunset(offset ...string) Time {
+	return getSunriseSunset(a, false, offset)
+}
+
+func getSunriseSunset(a *app, sunrise bool, offset []string) Time {
+	printString := "Sunset"
+	attrKey := "next_setting"
+	if sunrise {
+		printString = "Sunrise"
+		attrKey = "next_rising"
+	}
+	var t time.Duration
+	var err error
+	if len(offset) == 1 {
+		t, err = time.ParseDuration(offset[0])
+		if err != nil {
+			log.Fatalf("Could not parse offset passed to %s: \"%s\"", printString, offset[0])
 		}
-		if el.toState != "" {
-			subscribeTriggerMsg.Trigger.To = el.toState
-		}
-		log.Default().Println(subscribeTriggerMsg)
-		ws.WriteMessage(subscribeTriggerMsg, a.conn, a.ctx)
-		msg, _ := ws.ReadMessage(a.conn, a.ctx)
-		log.Default().Println(string(msg))
-		a.entityListenerIds[id] = el.callback
+	}
+	// get next sunrise/sunset time from HA
+	state, err := a.state.Get("sun.sun")
+	if err != nil {
+		log.Fatalln("Couldn't get sun.sun state from HA to calculate", printString)
 	}
 
+	nextSetOrRise := carbon.Parse(state.Attributes[attrKey].(string))
+	log.Default().Println(nextSetOrRise)
+
+	// add offset if set, this code works for negative values too
+	if t.Microseconds() != 0 {
+		nextSetOrRise = nextSetOrRise.AddMinutes(int(t.Minutes()))
+		log.Default().Println(nextSetOrRise)
+	}
+
+	return carbon2TimeString(nextSetOrRise)
+}
+
+func carbon2TimeString(c carbon.Carbon) Time {
+	return Time(fmt.Sprintf("%02d:%02d", c.Hour(), c.Minute()))
+}
+
+type subEvent struct {
+	Id        int64  `json:"id"`
+	Type      string `json:"type"`
+	EventType string `json:"event_type"`
 }
 
 func (a *app) Start() {
 	// schedules
 	go RunSchedules(a)
 
+	// subscribe to state_changed events
+	id := internal.GetId()
+	e := subEvent{
+		Id:        id,
+		Type:      "subscribe_events",
+		EventType: "state_changed",
+	}
+	ws.WriteMessage(e, a.conn, a.ctx)
+	a.entityListenersId = id
+
 	// entity listeners
 	elChan := make(chan ws.ChanMsg)
 	go ws.ListenWebsocket(a.conn, a.ctx, elChan)
 
-	log.Default().Println(a.entityListenerIds)
 	var msg ws.ChanMsg
 	for {
 		msg = <-elChan
-		log.Default().Println(string(msg.Raw))
-		if callback, ok := a.entityListenerIds[msg.Id]; ok {
-			log.Default().Println(msg, callback)
+		if a.entityListenersId == msg.Id {
+			go callEntityListeners(a, msg.Raw)
 		}
 	}
 
diff --git a/cmd/main/testing.go b/cmd/main/testing.go
index 8486e4d..b07d93b 100644
--- a/cmd/main/testing.go
+++ b/cmd/main/testing.go
@@ -2,7 +2,6 @@ package main
 
 import (
 	"log"
-	"time"
 
 	ga "github.com/saml-dev/gome-assistant"
 )
@@ -10,31 +9,25 @@ import (
 func main() {
 	app := ga.NewApp("192.168.86.67:8123")
 	defer app.Cleanup()
-	s := ga.ScheduleBuilder().Call(lightsOut).Every(time.Second * 5).Build()
-	s2 := ga.ScheduleBuilder().Call(cool).Every(time.Millisecond * 500).Build()
-	s3 := ga.ScheduleBuilder().Call(c).Every(time.Minute * 1).Build()
+	s := ga.ScheduleBuilder().Call(lightsOut).Daily().At(app.Sunset("1h")).Build()
 	app.RegisterSchedule(s)
-	app.RegisterSchedule(s2)
-	app.RegisterSchedule(s3)
-
 	simpleListener := ga.EntityListenerBuilder().
-		EntityIds("light.entryway_lamp").
+		EntityIds("group.office_ceiling_lights").
 		Call(listenerCB).
-		// OnlyBetween(ga.TimeOfDay(22, 00), ga.TimeOfDay(07, 00)).
+		// OnlyBetween("07:00", "14:00").
 		Build()
 	app.RegisterEntityListener(simpleListener)
 
 	app.Start()
 
-	log.Println(s)
-	log.Println(s2)
 }
 
 func lightsOut(service *ga.Service, state *ga.State) {
 	// service.InputDatetime.Set("input_datetime.garage_last_triggered_ts", time.Now())
 	// service.HomeAssistant.Toggle("group.living_room_lamps", map[string]any{"brightness_pct": 100})
 	// service.Light.Toggle("light.entryway_lamp", map[string]any{"brightness_pct": 100})
-	service.HomeAssistant.Toggle("light.el_gato_key_lights")
+	service.HomeAssistant.Toggle("light.entryway_lamp")
+	log.Default().Println("running lightsOut")
 	// service.HomeAssistant.Toggle("light.entryway_lamp")
 	// log.Default().Println("A")
 }
@@ -48,4 +41,8 @@ func c(service *ga.Service, state *ga.State) {
 	// log.Default().Println("C")
 }
 
-func listenerCB(service *ga.Service, data *ga.EntityData) {}
+func listenerCB(service *ga.Service, data ga.EntityData) {
+	log.Default().Println("hi katie")
+}
+
+// TODO: randomly placed, add .Throttle to Listener
diff --git a/entitylistener.go b/entitylistener.go
index 2428461..f284c05 100644
--- a/entitylistener.go
+++ b/entitylistener.go
@@ -1,8 +1,12 @@
 package gomeassistant
 
 import (
+	"encoding/json"
 	"errors"
 	"time"
+
+	"github.com/golang-module/carbon"
+	i "github.com/saml-dev/gome-assistant/internal"
 )
 
 type entityListener struct {
@@ -10,12 +14,12 @@ type entityListener struct {
 	callback     entityListenerCallback
 	fromState    string
 	toState      string
-	betweenStart time.Duration
-	betweenEnd   time.Duration
+	betweenStart Time
+	betweenEnd   Time
 	err          error
 }
 
-type entityListenerCallback func(*Service, *EntityData)
+type entityListenerCallback func(*Service, EntityData)
 
 // TODO: use this to flatten json sent from HA for trigger event
 type EntityData struct {
@@ -27,6 +31,27 @@ type EntityData struct {
 	LastChanged     time.Time
 }
 
+type stateChangedMsg struct {
+	ID    int    `json:"id"`
+	Type  string `json:"type"`
+	Event struct {
+		Data struct {
+			EntityID string   `json:"entity_id"`
+			NewState msgState `json:"new_state"`
+			OldState msgState `json:"old_state"`
+		} `json:"data"`
+		EventType string `json:"event_type"`
+		Origin    string `json:"origin"`
+	} `json:"event"`
+}
+
+type msgState struct {
+	EntityID    string         `json:"entity_id"`
+	LastChanged time.Time      `json:"last_changed"`
+	State       string         `json:"state"`
+	Attributes  map[string]any `json:"attributes"`
+}
+
 type triggerMsg struct {
 	Id    int64  `json:"id"`
 	Type  string `json:"type"`
@@ -60,7 +85,7 @@ type subscribeMsgTrigger struct {
 	To       string `json:"to"`
 }
 
-/* Builders */
+/* Methods */
 
 func EntityListenerBuilder() elBuilder1 {
 	return elBuilder1{entityListener{}}
@@ -94,7 +119,7 @@ type elBuilder3 struct {
 	entityListener
 }
 
-func (b elBuilder3) OnlyBetween(start time.Duration, end time.Duration) elBuilder3 {
+func (b elBuilder3) OnlyBetween(start Time, end Time) elBuilder3 {
 	b.entityListener.betweenStart = start
 	b.entityListener.betweenEnd = end
 	return b
@@ -113,3 +138,64 @@ func (b elBuilder3) ToState(s string) elBuilder3 {
 func (b elBuilder3) Build() entityListener {
 	return b.entityListener
 }
+
+/* Functions */
+func callEntityListeners(app *app, msgBytes []byte) {
+	msg := stateChangedMsg{}
+	json.Unmarshal(msgBytes, &msg)
+	data := msg.Event.Data
+	eid := data.EntityID
+	listeners, ok := app.entityListeners[eid]
+	if !ok {
+		// no listeners registered for this id
+		return
+	}
+
+	for _, l := range listeners {
+		// if betweenStart and betweenEnd both set, first account for midnight
+		// overlap, then only run if between those times.
+		if l.betweenStart != "" && l.betweenEnd != "" {
+			start := i.ParseTime(l.betweenStart)
+			end := i.ParseTime(l.betweenEnd)
+
+			// check for midnight overlap
+			if end.Lt(start) { // example turn on night lights when motion from 23:00 to 07:00
+				if end.IsPast() { // such as at 15:00, 22:00
+					end = end.AddDay()
+				} else {
+					start = start.SubDay() // such as at 03:00, 05:00
+				}
+			}
+
+			// skip callback if not inside the range
+			if !carbon.Now().BetweenIncludedStart(start, end) {
+				return
+			}
+		}
+		// otherwise, just check if before/after the individual times
+		if l.betweenStart != "" && i.ParseTime(l.betweenStart).IsFuture() {
+			return
+		}
+		if l.betweenEnd != "" && i.ParseTime(l.betweenEnd).IsPast() {
+			return
+		}
+
+		// don't run callback if fromState or toState are set and don't match
+		if l.fromState != "" && l.fromState != data.OldState.State {
+			return
+		}
+		if l.toState != "" && l.toState != data.NewState.State {
+			return
+		}
+
+		entityData := EntityData{
+			TriggerEntityId: eid,
+			FromState:       data.OldState.State,
+			FromAttributes:  data.OldState.Attributes,
+			ToState:         data.NewState.State,
+			ToAttributes:    data.NewState.Attributes,
+			LastChanged:     data.OldState.LastChanged,
+		}
+		l.callback(app.service, entityData)
+	}
+}
diff --git a/go.mod b/go.mod
index a20c756..e510c14 100644
--- a/go.mod
+++ b/go.mod
@@ -2,4 +2,15 @@ module github.com/saml-dev/gome-assistant
 
 go 1.19
 
-require github.com/gorilla/websocket v1.5.0
+require (
+	github.com/golang-module/carbon v1.6.9
+	github.com/gorilla/websocket v1.5.0
+)
+
+require (
+	github.com/gobuffalo/envy v1.7.0 // indirect
+	github.com/gobuffalo/packd v0.3.0 // indirect
+	github.com/gobuffalo/packr v1.30.1 // indirect
+	github.com/joho/godotenv v1.3.0 // indirect
+	github.com/rogpeppe/go-internal v1.3.0 // indirect
+)
diff --git a/go.sum b/go.sum
index e5a03d4..f85c10e 100644
--- a/go.sum
+++ b/go.sum
@@ -1,2 +1,76 @@
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
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+github.com/coreos/etcd v3.3.10+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=
+github.com/coreos/go-etcd v2.0.0+incompatible/go.mod h1:Jez6KQU2B/sWsbdaef3ED8NzMklzPG4d5KIOhIy30Tk=
+github.com/coreos/go-semver v0.2.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=
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+github.com/ugorji/go/codec v0.0.0-20181204163529-d75b2dcb6bc8/go.mod h1:VFNgLljTbGfSG7qAOspJ7OScBnGdDN/yBr0sguwnwf0=
+github.com/xordataexchange/crypt v0.0.3-0.20170626215501-b2862e3d0a77/go.mod h1:aYKd//L2LvnjZzWKhF00oedf4jCCReLcmhLdhm1A27Q=
+golang.org/x/crypto v0.0.0-20181203042331-505ab145d0a9/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
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+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
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+gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
diff --git a/internal/internal.go b/internal/internal.go
index 32e5ad2..2f1f9a2 100644
--- a/internal/internal.go
+++ b/internal/internal.go
@@ -1,8 +1,23 @@
 package internal
 
+import (
+	"log"
+	"time"
+
+	"github.com/golang-module/carbon"
+)
+
 var id int64 = 0
 
 func GetId() int64 {
 	id += 1
 	return id
 }
+
+func ParseTime[T ~string](s T) carbon.Carbon {
+	t, err := time.Parse("15:04", string(s))
+	if err != nil {
+		log.Fatalf("Failed to parse time string \"%s\"; format must be HH:MM.", s)
+	}
+	return carbon.Now().StartOfDay().SetHour(t.Hour()).SetMinute(t.Minute())
+}
diff --git a/internal/services/services.go b/internal/services/services.go
index d5da2fc..256a0ae 100644
--- a/internal/services/services.go
+++ b/internal/services/services.go
@@ -3,7 +3,6 @@ package services
 import (
 	"context"
 	"fmt"
-	"log"
 
 	"github.com/gorilla/websocket"
 	"github.com/saml-dev/gome-assistant/internal"
@@ -36,7 +35,6 @@ type BaseServiceRequest struct {
 
 func NewBaseServiceRequest(entityId string) BaseServiceRequest {
 	id := internal.GetId()
-	log.Default().Println("service id", id)
 	bsr := BaseServiceRequest{
 		Id:          fmt.Sprint(id),
 		RequestType: "call_service",
diff --git a/internal/websocket/reader.go b/internal/websocket/reader.go
index 3d87604..cc16d92 100644
--- a/internal/websocket/reader.go
+++ b/internal/websocket/reader.go
@@ -20,7 +20,6 @@ type ChanMsg struct {
 
 func ListenWebsocket(conn *websocket.Conn, ctx context.Context, c chan ChanMsg) {
 	for {
-		// log.Default().Println("reading message")
 		bytes, _ := ReadMessage(conn, ctx)
 		base := BaseMessage{}
 		json.Unmarshal(bytes, &base)
diff --git a/schedule.go b/schedule.go
index c11f139..85baf18 100644
--- a/schedule.go
+++ b/schedule.go
@@ -2,66 +2,13 @@ package gomeassistant
 
 import (
 	"fmt"
-	"log"
 	"reflect"
 	"runtime"
 	"time"
+
+	"github.com/saml-dev/gome-assistant/internal"
 )
 
-type sunriseSunset struct {
-	base        time.Duration
-	addition    time.Duration
-	subtraction time.Duration
-}
-
-func Sunrise() *sunriseSunset {
-	return &sunriseSunset{
-		base:        TimeOfDay(0, 10000),
-		addition:    TimeOfDay(0, 0),
-		subtraction: TimeOfDay(0, 0),
-	}
-}
-
-func Sunset() *sunriseSunset {
-	return &sunriseSunset{
-		base:        TimeOfDay(0, 20000),
-		addition:    TimeOfDay(0, 0),
-		subtraction: TimeOfDay(0, 0),
-	}
-}
-
-func (ss *sunriseSunset) Add(hm time.Duration) *sunriseSunset {
-	ss.addition = hm
-	return ss
-}
-
-func (ss *sunriseSunset) Subtract(hm time.Duration) *sunriseSunset {
-	ss.subtraction = hm
-	return ss
-}
-
-func (ss *sunriseSunset) Minutes() float64 {
-	return ss.base.Minutes() + ss.addition.Minutes() - ss.subtraction.Minutes()
-}
-
-type timeOfDay interface {
-	// Time represented as number of Minutes
-	// after midnight. E.g. 02:00 would be 120.
-	Minutes() float64
-}
-
-// TimeOfDay is a helper function to easily represent
-// a time of day as a time.Duration since midnight.
-func TimeOfDay(hour, minute int) time.Duration {
-	return time.Hour*time.Duration(hour) + time.Minute*time.Duration(minute)
-}
-
-// Duration is a wrapper for TimeOfDay that makes
-// semantic sense when used with Every()
-func Duration(hour, minute int) time.Duration {
-	return TimeOfDay(hour, minute)
-}
-
 type scheduleCallback func(*Service, *State)
 
 type schedule struct {
@@ -125,7 +72,7 @@ func ScheduleBuilder() scheduleBuilder {
 	return scheduleBuilder{
 		schedule{
 			frequency: 0,
-			offset:    TimeOfDay(0, 0),
+			offset:    0,
 		},
 	}
 }
@@ -162,8 +109,10 @@ func (sb scheduleBuilderCall) Daily() scheduleBuilderDaily {
 	return scheduleBuilderDaily(sb)
 }
 
-func (sb scheduleBuilderDaily) At(t timeOfDay) scheduleBuilderEnd {
-	sb.schedule.offset = convertTimeOfDayToActualOffset(t)
+// At takes a string 24hr format time like "15:30".
+func (sb scheduleBuilderDaily) At(s Time) scheduleBuilderEnd {
+	t := internal.ParseTime(s)
+	sb.schedule.offset = time.Duration(t.Hour())*time.Hour + time.Duration(t.Minute())*time.Minute
 	return scheduleBuilderEnd(sb)
 }
 
@@ -189,28 +138,6 @@ func getFunctionName(i interface{}) string {
 	return runtime.FuncForPC(reflect.ValueOf(i).Pointer()).Name()
 }
 
-func convertTimeOfDayToActualOffset(t timeOfDay) time.Duration {
-	mins := t.Minutes()
-	if mins > 15000 {
-		// TODO: same as below but w/ sunset
-		// don't forget to subtract 20000 here
-		return TimeOfDay(0, 0)
-	} else if mins > 5000 {
-		// TODO: use httpClient to get state of sun.sun
-		// to get next sunrise time
-		// don't forget to subtract 10000 here to get +- from sunrise that user requested
-
-		// retrieve next sunrise time
-
-		// use carbon.Parse() to create time.Time of that time
-
-		// return Time() of that many hours and minutes to set offset from midnight
-	} else if mins >= 1440 {
-		log.Fatalln("Offset (set via At() or Offset()) cannot be more than 1 day (23h59m)")
-	}
-	return TimeOfDay(0, int(mins))
-}
-
 // app.Start() functions
 func RunSchedules(a *app) {
 	if a.schedules.Len() == 0 {
diff --git a/state.go b/state.go
index f901be6..ba153d1 100644
--- a/state.go
+++ b/state.go
@@ -1,20 +1,35 @@
 package gomeassistant
 
-import "github.com/saml-dev/gome-assistant/internal/http"
+import (
+	"encoding/json"
+	"time"
+
+	"github.com/saml-dev/gome-assistant/internal/http"
+)
 
 // State is used to retrieve state from Home Assistant.
 type State struct {
 	httpClient *http.HttpClient
 }
 
+type EntityState struct {
+	EntityID    string         `json:"entity_id"`
+	State       string         `json:"state"`
+	Attributes  map[string]any `json:"attributes"`
+	LastChanged time.Time      `json:"last_changed"`
+	LastUpdated time.Time      `json:"last_updated"`
+}
+
 func NewState(c *http.HttpClient) *State {
 	return &State{httpClient: c}
 }
 
-func (s *State) Get(entityId string) (string, error) {
+func (s *State) Get(entityId string) (EntityState, error) {
 	resp, err := s.httpClient.GetState(entityId)
 	if err != nil {
-		return "", err
+		return EntityState{}, err
 	}
-	return string(resp), nil
+	es := EntityState{}
+	json.Unmarshal(resp, &es)
+	return es, nil
 }