diff --git a/main.go b/main.go
index 3b99cef..3859f14 100644
--- a/main.go
+++ b/main.go
@@ -96,6 +96,7 @@ func main() {
 	settingsHandler := routes.NewSettingsHandler(userService)
 	publicHandler := routes.NewIndexHandler(userService, keyValueService)
 	compatV1AllHandler := v1Routes.NewCompatV1AllHandler(summaryService)
+	compatV1SummariesHandler := v1Routes.NewCompatV1SummariesHandler(summaryService)
 
 	// Setup Routers
 	router := mux.NewRouter()
@@ -143,6 +144,7 @@ func main() {
 
 	// Compat V1 API Routes
 	compatV1Router.Path("/users/{user}/all_time_since_today").Methods(http.MethodGet).HandlerFunc(compatV1AllHandler.ApiGet)
+	compatV1Router.Path("/users/{user}/summaries").Methods(http.MethodGet).HandlerFunc(compatV1SummariesHandler.ApiGet)
 
 	// Static Routes
 	router.PathPrefix("/assets").Handler(http.FileServer(http.Dir("./static")))
diff --git a/models/compat/v1/all_time.go b/models/compat/v1/all_time.go
index 32b2320..3ff00a2 100644
--- a/models/compat/v1/all_time.go
+++ b/models/compat/v1/all_time.go
@@ -1,13 +1,36 @@
 package v1
 
+import (
+	"github.com/muety/wakapi/models"
+	"github.com/muety/wakapi/utils"
+	"time"
+)
+
 // https://wakatime.com/developers#all_time_since_today
 
-type AllTimeViewModel struct {
-	Data *AllTimeViewModelData `json:"data"`
+type WakatimeAllTime struct {
+	Data *wakatimeAllTimeData `json:"data"`
 }
 
-type AllTimeViewModelData struct {
-	Seconds    float32 `json:"seconds"`       // total number of seconds logged since account created
-	Text       string  `json:"text"`          // total time logged since account created as human readable string>
-	IsUpToDate bool    `json:"is_up_to_date"` // true if the stats are up to date; when false, a 202 response code is returned and stats will be refreshed soon>
+type wakatimeAllTimeData struct {
+	TotalSeconds float32 `json:"total_seconds"` // total number of seconds logged since account created
+	Text         string  `json:"text"`          // total time logged since account created as human readable string>
+	IsUpToDate   bool    `json:"is_up_to_date"` // true if the stats are up to date; when false, a 202 response code is returned and stats will be refreshed soon>
+}
+
+func NewAllTimeFrom(summary *models.Summary, filters *Filters) *WakatimeAllTime {
+	var total time.Duration
+	if key := filters.Project; key != "" {
+		total = summary.TotalTimeByKey(models.SummaryProject, key)
+	} else {
+		total = summary.TotalTime()
+	}
+
+	return &WakatimeAllTime{
+		Data: &wakatimeAllTimeData{
+			TotalSeconds: float32(total.Seconds()),
+			Text:         utils.FmtWakatimeDuration(total),
+			IsUpToDate:   true,
+		},
+	}
 }
diff --git a/models/compat/v1/common.go b/models/compat/v1/common.go
new file mode 100644
index 0000000..7ddeae6
--- /dev/null
+++ b/models/compat/v1/common.go
@@ -0,0 +1,5 @@
+package v1
+
+type Filters struct {
+	Project string
+}
diff --git a/models/compat/v1/summaries.go b/models/compat/v1/summaries.go
new file mode 100644
index 0000000..4a2a280
--- /dev/null
+++ b/models/compat/v1/summaries.go
@@ -0,0 +1,147 @@
+package v1
+
+import (
+	"fmt"
+	"github.com/muety/wakapi/models"
+	"github.com/muety/wakapi/utils"
+	"math"
+	"time"
+)
+
+// https://wakatime.com/developers#summaries
+// https://pastr.de/v/736450
+
+type WakatimeSummaries struct {
+	Data  []*wakatimeSummariesData `json:"data"`
+	End   time.Time                `json:"end"`
+	Start time.Time                `json:"start"`
+}
+
+type wakatimeSummariesData struct {
+	Categories       []*wakatimeSummariesEntry    `json:"categories"`
+	Dependencies     []*wakatimeSummariesEntry    `json:"dependencies"`
+	Editors          []*wakatimeSummariesEntry    `json:"editors"`
+	Languages        []*wakatimeSummariesEntry    `json:"languages"`
+	Machines         []*wakatimeSummariesEntry    `json:"machines"`
+	OperatingSystems []*wakatimeSummariesEntry    `json:"operating_systems"`
+	Projects         []*wakatimeSummariesEntry    `json:"projects"`
+	GrandTotal       *wakatimeSummariesGrandTotal `json:"grand_total"`
+	Range            *wakatimeSummariesRange      `json:"range"`
+}
+
+type wakatimeSummariesEntry struct {
+	Digital      string  `json:"digital"`
+	Hours        int     `json:"hours"`
+	Minutes      int     `json:"minutes"`
+	Name         string  `json:"name"`
+	Percent      float64 `json:"percent"`
+	Seconds      int     `json:"seconds"`
+	Text         string  `json:"text"`
+	TotalSeconds float64 `json:"total_seconds"`
+}
+
+type wakatimeSummariesGrandTotal struct {
+	Digital      string  `json:"digital"`
+	Hours        int     `json:"hours"`
+	Minutes      int     `json:"minutes"`
+	Text         string  `json:"text"`
+	TotalSeconds float64 `json:"total_seconds"`
+}
+
+type wakatimeSummariesRange struct {
+	Date     string    `json:"date"`
+	End      time.Time `json:"end"`
+	Start    time.Time `json:"start"`
+	Text     string    `json:"text"`
+	Timezone string    `json:"timezone"`
+}
+
+func NewSummariesFrom(summaries []*models.Summary, filters *Filters) *WakatimeSummaries {
+	data := make([]*wakatimeSummariesData, len(summaries))
+	minDate, maxDate := time.Now().Add(1*time.Second), time.Time{}
+
+	for i, s := range summaries {
+		data[i] = newDataFrom(s)
+
+		if s.FromTime.Before(minDate) {
+			minDate = s.FromTime
+		}
+		if s.ToTime.After(maxDate) {
+			maxDate = s.ToTime
+		}
+	}
+
+	return &WakatimeSummaries{
+		Data:  data,
+		End:   maxDate,
+		Start: minDate,
+	}
+}
+
+func newDataFrom(s *models.Summary) *wakatimeSummariesData {
+	zone, _ := time.Now().Zone()
+	total := s.TotalTime()
+	totalHrs, totalMins := int(total.Hours()), int((total - time.Duration(total.Hours())*time.Hour).Minutes())
+
+	data := &wakatimeSummariesData{
+		Categories:       make([]*wakatimeSummariesEntry, 0),
+		Dependencies:     make([]*wakatimeSummariesEntry, 0),
+		Editors:          make([]*wakatimeSummariesEntry, len(s.Editors)),
+		Languages:        make([]*wakatimeSummariesEntry, len(s.Languages)),
+		Machines:         make([]*wakatimeSummariesEntry, len(s.Machines)),
+		OperatingSystems: make([]*wakatimeSummariesEntry, len(s.OperatingSystems)),
+		Projects:         make([]*wakatimeSummariesEntry, len(s.Projects)),
+		GrandTotal: &wakatimeSummariesGrandTotal{
+			Digital:      fmt.Sprintf("%d:%d", totalHrs, totalMins),
+			Hours:        totalHrs,
+			Minutes:      totalMins,
+			Text:         utils.FmtWakatimeDuration(total),
+			TotalSeconds: total.Seconds(),
+		},
+		Range: &wakatimeSummariesRange{
+			Date:     time.Now().Format(time.RFC3339),
+			End:      s.ToTime,
+			Start:    s.FromTime,
+			Text:     "",
+			Timezone: zone,
+		},
+	}
+
+	for i, e := range s.Projects {
+		data.Projects[i] = convertEntry(e, s.TotalTimeBy(models.SummaryProject))
+	}
+	for i, e := range s.Editors {
+		data.Editors[i] = convertEntry(e, s.TotalTimeBy(models.SummaryEditor))
+	}
+	for i, e := range s.Languages {
+		data.Languages[i] = convertEntry(e, s.TotalTimeBy(models.SummaryLanguage))
+	}
+	for i, e := range s.OperatingSystems {
+		data.OperatingSystems[i] = convertEntry(e, s.TotalTimeBy(models.SummaryOS))
+	}
+	for i, e := range s.Machines {
+		data.Machines[i] = convertEntry(e, s.TotalTimeBy(models.SummaryMachine))
+	}
+
+	return data
+}
+
+func convertEntry(e *models.SummaryItem, entityTotal time.Duration) *wakatimeSummariesEntry {
+	// this is a workaround, since currently, the total time of a summary item is mistakenly represented in seconds
+	// TODO: fix some day, while migrating persisted summary items
+	total := e.Total * time.Second
+	hrs := int(total.Hours())
+	mins := int((total - time.Duration(hrs)*time.Hour).Minutes())
+	secs := int((total - time.Duration(hrs)*time.Hour - time.Duration(mins)*time.Minute).Seconds())
+
+	return &wakatimeSummariesEntry{
+		Digital:      fmt.Sprintf("%d:%d:%d", hrs, mins, secs),
+		Hours:        hrs,
+		Minutes:      mins,
+		Name:         e.Key,
+		Percent:      math.Round((total.Seconds()/entityTotal.Seconds())*1e4) / 100,
+		Seconds:      secs,
+		Text:         utils.FmtWakatimeDuration(total),
+		TotalSeconds: total.Seconds(),
+	}
+}
diff --git a/models/summary.go b/models/summary.go
index 9f40d41..2c4d333 100644
--- a/models/summary.go
+++ b/models/summary.go
@@ -125,7 +125,6 @@ func (s *Summary) TotalTime() time.Duration {
 	var timeSum time.Duration
 
 	mappedItems := s.MappedItems()
-
 	// calculate total duration from any of the present sets of items
 	for _, t := range s.Types() {
 		if items := mappedItems[t]; len(*items) > 0 {
@@ -136,15 +135,26 @@ func (s *Summary) TotalTime() time.Duration {
 		}
 	}
 
-	return timeSum
+	return timeSum * time.Second
 }
 
-func (s *Summary) TotalTimeBy(entityType uint8, key string) time.Duration {
+func (s *Summary) TotalTimeBy(entityType uint8) time.Duration {
 	var timeSum time.Duration
 
 	mappedItems := s.MappedItems()
+	if items := mappedItems[entityType]; len(*items) > 0 {
+		for _, item := range *items {
+			timeSum += item.Total
+		}
+	}
 
-	// calculate total duration from any of the present sets of items
+	return timeSum * time.Second
+}
+
+func (s *Summary) TotalTimeByKey(entityType uint8, key string) time.Duration {
+	var timeSum time.Duration
+
+	mappedItems := s.MappedItems()
 	if items := mappedItems[entityType]; len(*items) > 0 {
 		for _, item := range *items {
 			if item.Key != key {
@@ -154,5 +164,5 @@ func (s *Summary) TotalTimeBy(entityType uint8, key string) time.Duration {
 		}
 	}
 
-	return timeSum
+	return timeSum * time.Second
 }
diff --git a/routes/compat/v1/all_time.go b/routes/compat/v1/all_time.go
index ad0c95b..0f65c00 100644
--- a/routes/compat/v1/all_time.go
+++ b/routes/compat/v1/all_time.go
@@ -25,6 +25,8 @@ func NewCompatV1AllHandler(summaryService *services.SummaryService) *CompatV1All
 
 func (h *CompatV1AllHandler) ApiGet(w http.ResponseWriter, r *http.Request) {
 	vars := mux.Vars(r)
+	values, _ := url.ParseQuery(r.URL.RawQuery)
+
 	requestedUser := vars["user"]
 	authorizedUser := r.Context().Value(models.UserKey).(*models.User)
 
@@ -33,10 +35,6 @@ func (h *CompatV1AllHandler) ApiGet(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	values, _ := url.ParseQuery(r.URL.RawQuery)
-	values.Set("interval", models.IntervalAny)
-	r.URL.RawQuery = values.Encode()
-
 	summary, err, status := h.loadUserSummary(authorizedUser)
 	if err != nil {
 		w.WriteHeader(status)
@@ -44,21 +42,7 @@ func (h *CompatV1AllHandler) ApiGet(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	var total time.Duration
-	if key := values.Get("project"); key != "" {
-		total = summary.TotalTimeBy(models.SummaryProject, key)
-	} else {
-		total = summary.TotalTime()
-	}
-
-	vm := &v1.AllTimeViewModel{
-		Data: &v1.AllTimeViewModelData{
-			Seconds:    float32(total),
-			Text:       utils.FmtWakatimeDuration(total * time.Second),
-			IsUpToDate: true,
-		},
-	}
-
+	vm := v1.NewAllTimeFrom(summary, &v1.Filters{Project: values.Get("project")})
 	utils.RespondJSON(w, http.StatusOK, vm)
 }
 
diff --git a/routes/compat/v1/summaries.go b/routes/compat/v1/summaries.go
new file mode 100644
index 0000000..7a69fef
--- /dev/null
+++ b/routes/compat/v1/summaries.go
@@ -0,0 +1,96 @@
+package v1
+
+import (
+	"errors"
+	"github.com/gorilla/mux"
+	"github.com/muety/wakapi/models"
+	v1 "github.com/muety/wakapi/models/compat/v1"
+	"github.com/muety/wakapi/services"
+	"github.com/muety/wakapi/utils"
+	"net/http"
+	"strings"
+	"time"
+)
+
+type CompatV1SummariesHandler struct {
+	summarySrvc *services.SummaryService
+	config      *models.Config
+}
+
+func NewCompatV1SummariesHandler(summaryService *services.SummaryService) *CompatV1SummariesHandler {
+	return &CompatV1SummariesHandler{
+		summarySrvc: summaryService,
+		config:      models.GetConfig(),
+	}
+}
+
+/*
+TODO: support parameters: branches, timeout, writes_only, timezone
+https://wakatime.com/developers#summaries
+timezone can be specified via an offset suffix (e.g. +02:00) in date strings
+*/
+
+func (h *CompatV1SummariesHandler) ApiGet(w http.ResponseWriter, r *http.Request) {
+	vars := mux.Vars(r)
+	requestedUser := vars["user"]
+	authorizedUser := r.Context().Value(models.UserKey).(*models.User)
+
+	if requestedUser != authorizedUser.ID && requestedUser != "current" {
+		w.WriteHeader(http.StatusForbidden)
+		return
+	}
+
+	summaries, err, status := h.loadUserSummaries(r)
+	if err != nil {
+		w.WriteHeader(status)
+		w.Write([]byte(err.Error()))
+		return
+	}
+
+	vm := v1.NewSummariesFrom(summaries, &v1.Filters{})
+	utils.RespondJSON(w, http.StatusOK, vm)
+}
+
+func (h *CompatV1SummariesHandler) loadUserSummaries(r *http.Request) ([]*models.Summary, error, int) {
+	user := r.Context().Value(models.UserKey).(*models.User)
+	params := r.URL.Query()
+
+	var start, end time.Time
+	// TODO: find out what other special dates are supported by wakatime (e.g. tomorrow, yesterday, ...?)
+	if startKey, endKey := params.Get("start"), params.Get("end"); startKey == "today" && startKey == endKey {
+		start = utils.StartOfToday()
+		end = time.Now()
+	} else {
+		var err error
+
+		start, err = time.Parse(time.RFC3339, strings.Replace(startKey, " ", "+", 1))
+		if err != nil {
+			return nil, errors.New("missing required 'start' parameter"), http.StatusBadRequest
+		}
+
+		end, err = time.Parse(time.RFC3339, strings.Replace(endKey, " ", "+", 1))
+		if err != nil {
+			return nil, errors.New("missing required 'end' parameter"), http.StatusBadRequest
+		}
+	}
+
+	overallParams := &models.SummaryParams{
+		From:      start,
+		To:        end,
+		User:      user,
+		Recompute: false,
+	}
+
+	intervals := utils.SplitRangeByDays(overallParams.From, overallParams.To)
+	summaries := make([]*models.Summary, len(intervals))
+
+	for i, interval := range intervals {
+		summary, err := h.summarySrvc.Construct(interval[0], interval[1], user, false) // 'to' is always constant
+		if err != nil {
+			return nil, err, http.StatusInternalServerError
+		}
+		summaries[i] = summary
+	}
+
+	return summaries, nil, http.StatusOK
+}
diff --git a/services/heartbeat.go b/services/heartbeat.go
index d4f5ee6..d73cd6b 100644
--- a/services/heartbeat.go
+++ b/services/heartbeat.go
@@ -77,7 +77,7 @@ func (srv *HeartbeatService) DeleteBefore(t time.Time) error {
 }
 
 func (srv *HeartbeatService) CleanUp() error {
-	refTime := utils.StartOfDay().Add(-cleanUpInterval)
+	refTime := utils.StartOfToday().Add(-cleanUpInterval)
 	if err := srv.DeleteBefore(refTime); err != nil {
 		log.Printf("Failed to clean up heartbeats older than %v – %v\n", refTime, err)
 		return err
diff --git a/utils/common.go b/utils/common.go
index 86f2e94..738fbd2 100644
--- a/utils/common.go
+++ b/utils/common.go
@@ -43,15 +43,14 @@ func MakeConnectionString(config *models.Config) string {
 }
 
 func mySqlConnectionString(config *models.Config) string {
-	location, _ := time.LoadLocation("Local")
-	return fmt.Sprintf(
-		"%s:%s@tcp(%s:%d)/%s?charset=utf8&parseTime=true&loc=%s",
+	//location, _ := time.LoadLocation("Local")
+	return fmt.Sprintf("%s:%s@tcp(%s:%d)/%s?charset=utf8&parseTime=true&loc=%s",
 		config.DbUser,
 		config.DbPassword,
 		config.DbHost,
 		config.DbPort,
 		config.DbName,
-		location.String(),
+		"Local",
 	)
 }
 
diff --git a/utils/date.go b/utils/date.go
index 2b81b59..faacd60 100644
--- a/utils/date.go
+++ b/utils/date.go
@@ -5,9 +5,12 @@ import (
 	"time"
 )
 
-func StartOfDay() time.Time {
-	ref := time.Now()
-	return time.Date(ref.Year(), ref.Month(), ref.Day(), 0, 0, 0, 0, ref.Location())
+func StartOfToday() time.Time {
+	return StartOfDay(time.Now())
+}
+
+func StartOfDay(date time.Time) time.Time {
+	return time.Date(date.Year(), date.Month(), date.Day(), 0, 0, 0, 0, date.Location())
 }
 
 func StartOfWeek() time.Time {
@@ -26,6 +29,21 @@ func StartOfYear() time.Time {
 	return time.Date(ref.Year(), time.January, 1, 0, 0, 0, 0, ref.Location())
 }
 
+func SplitRangeByDays(from time.Time, to time.Time) [][]time.Time {
+	intervals := make([][]time.Time, 0)
+
+	for t1 := from; t1.Before(to); {
+		t2 := StartOfDay(t1).Add(24 * time.Hour)
+		if t2.After(to) {
+			t2 = to
+		}
+		intervals = append(intervals, []time.Time{t1, t2})
+		t1 = t2
+	}
+
+	return intervals
+}
+
 func FmtWakatimeDuration(d time.Duration) string {
 	d = d.Round(time.Minute)
 	h := d / time.Hour
diff --git a/utils/summary.go b/utils/summary.go
index d233115..c85ee10 100644
--- a/utils/summary.go
+++ b/utils/summary.go
@@ -9,18 +9,16 @@ import (
 
 func ParseSummaryParams(r *http.Request) (*models.SummaryParams, error) {
 	user := r.Context().Value(models.UserKey).(*models.User)
-
 	params := r.URL.Query()
-
 	interval := params.Get("interval")
 
 	from, err := ParseDate(params.Get("from"))
 	if err != nil {
 		switch interval {
 		case models.IntervalToday:
-			from = StartOfDay()
+			from = StartOfToday()
 		case models.IntervalLastDay:
-			from = StartOfDay().Add(-24 * time.Hour)
+			from = StartOfToday().Add(-24 * time.Hour)
 		case models.IntervalLastWeek:
 			from = StartOfWeek()
 		case models.IntervalLastMonth:
@@ -38,7 +36,7 @@ func ParseSummaryParams(r *http.Request) (*models.SummaryParams, error) {
 
 	recompute := params.Get("recompute") != "" && params.Get("recompute") != "false"
 
-	to := StartOfDay()
+	to := StartOfToday()
 	if live {
 		to = time.Now()
 	}
diff --git a/version.txt b/version.txt
index 6f2d365..e33692a 100644
--- a/version.txt
+++ b/version.txt
@@ -1 +1 @@
-1.9.2
\ No newline at end of file
+1.10.1
\ No newline at end of file