diff --git a/cmd/list/work_packages.go b/cmd/list/work_packages.go
index 702bacf..dd88f4e 100644
--- a/cmd/list/work_packages.go
+++ b/cmd/list/work_packages.go
@@ -2,6 +2,9 @@ package list
 
 import (
 	"fmt"
+	"github.com/opf/openproject-cli/components/requests"
+	"github.com/opf/openproject-cli/components/resources"
+	"github.com/opf/openproject-cli/components/resources/work_packages/filters"
 	"os"
 	"regexp"
 	"strconv"
@@ -23,6 +26,10 @@ var typeFilter string
 var includeSubProjects bool
 var subProject string
 
+var activeFilters = []resources.Filter{
+	filters.NewTimestampFilter(),
+}
+
 var workPackagesCmd = &cobra.Command{
 	Use:     "workpackages",
 	Aliases: []string{"wps"},
@@ -32,12 +39,19 @@ var workPackagesCmd = &cobra.Command{
 }
 
 func listWorkPackages(_ *cobra.Command, _ []string) {
+	// This needs to be removed, once all filters are built the "new" way
 	if errorText := validateCommandFlags(); len(errorText) > 0 {
 		printer.ErrorText(errorText)
 		return
 	}
 
-	collection, err := work_packages.All(filterOptions(), showTotal)
+	query, err := buildQuery()
+	if err != nil {
+		printer.ErrorText(err.Error())
+		return
+	}
+
+	collection, err := work_packages.All(filterOptions(), query, showTotal)
 	switch {
 	case err == nil && showTotal:
 		printer.Number(collection.Total)
@@ -59,6 +73,21 @@ func validateCommandFlags() (errorText string) {
 	}
 }
 
+func buildQuery() (requests.Query, error) {
+	var q requests.Query
+
+	for _, filter := range activeFilters {
+		err := filter.ValidateInput()
+		if err != nil {
+			return requests.NewEmptyQuery(), err
+		}
+
+		q = q.Merge(filter.Query())
+	}
+
+	return q, nil
+}
+
 func filterOptions() *map[work_packages.FilterOption]string {
 	options := make(map[work_packages.FilterOption]string)
 
diff --git a/cmd/list/work_packages_flags.go b/cmd/list/work_packages_flags.go
index f718356..b48bf1e 100644
--- a/cmd/list/work_packages_flags.go
+++ b/cmd/list/work_packages_flags.go
@@ -1,5 +1,9 @@
 package list
 
+import (
+	"github.com/opf/openproject-cli/components/resources"
+)
+
 func initWorkPackagesFlags() {
 	workPackagesCmd.Flags().StringVarP(
 		&assignee,
@@ -71,4 +75,17 @@ the default is false.`)
 		"",
 		false,
 		"Show only the total number of work packages matching the filter options.")
+
+	for _, filter := range activeFilters {
+		switch filter.(type) {
+		case resources.StringValueFilter:
+			workPackagesCmd.Flags().StringVarP(
+				filter.Value(),
+				filter.Name(),
+				filter.ShortHand(),
+				filter.(resources.StringValueFilter).DefaultValue(),
+				filter.Usage(),
+			)
+		}
+	}
 }
diff --git a/components/requests/query.go b/components/requests/query.go
index 873088e..5032b96 100644
--- a/components/requests/query.go
+++ b/components/requests/query.go
@@ -26,6 +26,24 @@ func (filter Filter) String() string {
 	)
 }
 
+func (query Query) Merge(another Query) Query {
+	filters := append(query.filters, another.filters...)
+
+	attributes := query.attributes
+	if attributes == nil {
+		attributes = make(map[string]string)
+	}
+
+	for key, value := range another.attributes {
+		attributes[key] = value
+	}
+
+	return Query{
+		attributes: attributes,
+		filters:    filters,
+	}
+}
+
 func (query Query) String() string {
 	queryStr := filtersQueryAttribute(query.filters)
 	for key, value := range query.attributes {
@@ -60,6 +78,10 @@ func NewQuery(attributes map[string]string, filters []Filter) Query {
 	return Query{attributes: attributes, filters: filters}
 }
 
+func NewEmptyQuery() Query {
+	return Query{attributes: make(map[string]string), filters: []Filter{}}
+}
+
 func NewFilterQuery(filters []Filter) Query {
 	attributes := map[string]string{
 		"pageSize": "100",
diff --git a/components/requests/query_test.go b/components/requests/query_test.go
index 9e7f44d..100522a 100644
--- a/components/requests/query_test.go
+++ b/components/requests/query_test.go
@@ -99,3 +99,31 @@ func TestQuery_String(t *testing.T) {
 		t.Errorf("Expected %s to contain %s", queryString, expected)
 	}
 }
+
+func TestQuery_Merge(t *testing.T) {
+	attributes1 := map[string]string{
+		"pageSize":   "20",
+		"timestamps": "PT0S",
+	}
+	filters1 := []requests.Filter{
+		work_packages.StatusFilter("1,3"),
+	}
+
+	attributes2 := map[string]string{
+		"pageSize":           "25",
+		"includeSubprojects": "true",
+	}
+	filters2 := []requests.Filter{
+		work_packages.TypeFilter("!1"),
+	}
+
+	query1 := requests.NewQuery(attributes1, filters1)
+	query2 := requests.NewQuery(attributes2, filters2)
+
+	result := query1.Merge(query2)
+	expected := "filters=%5B%7B%22status%22%3A%7B%22operator%22%3A%22%3D%22%2C%22values%22%3A%5B%221%22%2C%223%22%5D%7D%7D%2C%7B%22type%22%3A%7B%22operator%22%3A%22%21%22%2C%22values%22%3A%5B%221%22%5D%7D%7D%5D&pageSize=25&timestamps=PT0S&includeSubprojects=true"
+
+	if result.String() != expected {
+		t.Errorf("Expected %s, but got %s", expected, result.String())
+	}
+}
diff --git a/components/resources/filters.go b/components/resources/filters.go
index 73026c0..0f8151f 100644
--- a/components/resources/filters.go
+++ b/components/resources/filters.go
@@ -9,3 +9,16 @@ func TypeAheadFilter(input string) requests.Filter {
 		Values:   []string{input},
 	}
 }
+
+type Filter interface {
+	Value() *string
+	Name() string
+	ShortHand() string
+	Usage() string
+	ValidateInput() error
+	Query() requests.Query
+}
+
+type StringValueFilter interface {
+	DefaultValue() string
+}
diff --git a/components/resources/work_packages/filters/timestamp.go b/components/resources/work_packages/filters/timestamp.go
new file mode 100644
index 0000000..ada3ca6
--- /dev/null
+++ b/components/resources/work_packages/filters/timestamp.go
@@ -0,0 +1,51 @@
+package filters
+
+import (
+	"time"
+
+	"github.com/opf/openproject-cli/components/requests"
+)
+
+type TimestampFilter struct {
+	value string
+}
+
+func (f *TimestampFilter) Value() *string {
+	return &f.value
+}
+
+func (f *TimestampFilter) Name() string {
+	return "timestamp"
+}
+
+func (f *TimestampFilter) ShortHand() string {
+	return ""
+}
+
+func (f *TimestampFilter) Usage() string {
+	return `Returns the list of work packages at a specific timestamp. The timestamp should
+be in the format of 'YYYY-MM-DDTHH:MM:SSZ' or date only 'YYYY-MM-DD', which
+then assumes the time being 00:00:00Z.`
+}
+
+func (f *TimestampFilter) ValidateInput() error {
+	_, err := time.Parse(time.DateOnly, f.value)
+	if err == nil {
+		return nil
+	}
+
+	_, err = time.Parse(time.RFC3339, f.value)
+	return err
+}
+
+func (f *TimestampFilter) DefaultValue() string {
+	return ""
+}
+
+func (f *TimestampFilter) Query() requests.Query {
+	return requests.NewQuery(map[string]string{"timestamps": f.value}, nil)
+}
+
+func NewTimestampFilter() *TimestampFilter {
+	return &TimestampFilter{}
+}
diff --git a/components/resources/work_packages/read.go b/components/resources/work_packages/read.go
index 3db8291..6534940 100644
--- a/components/resources/work_packages/read.go
+++ b/components/resources/work_packages/read.go
@@ -19,7 +19,7 @@ func Lookup(id uint64) (*models.WorkPackage, error) {
 	return workPackage.Convert(), nil
 }
 
-func All(filterOptions *map[FilterOption]string, showOnlyTotal bool) (*models.WorkPackageCollection, error) {
+func All(filterOptions *map[FilterOption]string, query requests.Query, showOnlyTotal bool) (*models.WorkPackageCollection, error) {
 	var filters []requests.Filter
 	var projectId *uint64
 	var queryAttributes = make(map[string]string)
@@ -50,7 +50,8 @@ func All(filterOptions *map[FilterOption]string, showOnlyTotal bool) (*models.Wo
 		queryAttributes["pageSize"] = "-1"
 	}
 
-	query := requests.NewQuery(queryAttributes, filters)
+	legacyQuery := requests.NewQuery(queryAttributes, filters)
+	newQuery := legacyQuery.Merge(query)
 
 	requestUrl := paths.WorkPackages()
 
@@ -58,7 +59,7 @@ func All(filterOptions *map[FilterOption]string, showOnlyTotal bool) (*models.Wo
 		requestUrl = paths.ProjectWorkPackages(*projectId)
 	}
 
-	response, err := requests.Get(requestUrl, &query)
+	response, err := requests.Get(requestUrl, &newQuery)
 	if err != nil {
 		return nil, err
 	}