diff --git a/routes/summary.go b/routes/summary.go
index f45e34c..f3084d2 100644
--- a/routes/summary.go
+++ b/routes/summary.go
@@ -9,6 +9,13 @@ import (
 	"github.com/n1try/wakapi/utils"
 )
 
+const (
+	IntervalLastDay   string = "day"
+	IntervalLastWeek  string = "week"
+	IntervalLastMonth string = "month"
+	IntervalLastYear  string = "year"
+)
+
 type SummaryHandler struct {
 	SummarySrvc *services.SummaryService
 }
@@ -23,15 +30,24 @@ func (h *SummaryHandler) Get(w http.ResponseWriter, r *http.Request) {
 	params := r.URL.Query()
 	from, err := utils.ParseDate(params.Get("from"))
 	if err != nil {
-		w.WriteHeader(http.StatusBadRequest)
-		w.Write([]byte("Missing 'from' parameter"))
-		return
+		interval := params.Get("interval")
+		switch interval {
+		case IntervalLastDay:
+			from = utils.StartOfDay().Add(-24 * time.Hour)
+		case IntervalLastWeek:
+			from = utils.StartOfWeek()
+		case IntervalLastMonth:
+			from = utils.StartOfMonth()
+		case IntervalLastYear:
+			from = utils.StartOfYear()
+		default:
+			w.WriteHeader(http.StatusBadRequest)
+			w.Write([]byte("Missing 'from' parameter"))
+			return
+		}
 	}
 
-	now := time.Now()
-	to := time.Date(now.Year(), now.Month(), now.Day(), 0, 0, 0, 0, now.Location()) // Start of current day
-
-	summary, err := h.SummarySrvc.GetSummary(from, to, user)
+	summary, err := h.SummarySrvc.GetSummary(from, utils.StartOfDay(), user)
 	if err != nil {
 		w.WriteHeader(http.StatusInternalServerError)
 		return
diff --git a/utils/date.go b/utils/date.go
new file mode 100644
index 0000000..7709ba5
--- /dev/null
+++ b/utils/date.go
@@ -0,0 +1,42 @@
+package utils
+
+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 StartOfWeek() time.Time {
+	ref := time.Now()
+	return firstDayOfISOWeek(ref.Year(), ref.Day(), ref.Location())
+}
+
+func StartOfMonth() time.Time {
+	ref := time.Now()
+	return time.Date(ref.Year(), ref.Month(), 0, 0, 0, 0, 0, ref.Location())
+}
+
+func StartOfYear() time.Time {
+	ref := time.Now()
+	return time.Date(ref.Year(), 0, 0, 0, 0, 0, 0, ref.Location())
+}
+
+// https://stackoverflow.com/a/18632496
+func firstDayOfISOWeek(year int, week int, timezone *time.Location) time.Time {
+	date := time.Date(year, 0, 0, 0, 0, 0, 0, timezone)
+	isoYear, isoWeek := date.ISOWeek()
+	for date.Weekday() != time.Monday { // iterate back to Monday
+		date = date.AddDate(0, 0, -1)
+		isoYear, isoWeek = date.ISOWeek()
+	}
+	for isoYear < year { // iterate forward to the first day of the first week
+		date = date.AddDate(0, 0, 1)
+		isoYear, isoWeek = date.ISOWeek()
+	}
+	for isoWeek < week { // iterate forward to the first day of the given week
+		date = date.AddDate(0, 0, 1)
+		isoYear, isoWeek = date.ISOWeek()
+	}
+	return date
+}