feat: implement caldav search

vendor/github.com/dolanor/caldav-go/icalendar/components/timezone.go

@@ -0,0 +1,40 @@
+package components
+
+import (
+	"fmt"
+	"github.com/dolanor/caldav-go/icalendar/values"
+	"net/url"
+	"time"
+)
+
+type TimeZone struct {
+
+	// defines the persistent, globally unique identifier for the calendar component.
+	Id string `ical:"tzid,required"`
+
+	// the location name, as defined by the standards body
+	ExtLocationName string `ical:"x-lic-location,omitempty"`
+
+	// defines a Uniform Resource Locator (URL) associated with the iCalendar object.
+	Url *values.Url `ical:"tzurl,omitempty"`
+
+	// specifies the date and time that the information associated with the calendar component was last revised in the
+	// calendar store.
+	// Note: This is analogous to the modification date and time for a file in the file system.
+	LastModified *values.DateTime `ical:"last-modified,omitempty"`
+
+	// TODO need to figure out how to handle standard and daylight savings time
+
+}
+
+func NewDynamicTimeZone(location *time.Location) *TimeZone {
+	t := new(TimeZone)
+	t.Id = location.String()
+	t.ExtLocationName = location.String()
+	t.Url = values.NewUrl(url.URL{
+		Scheme: "http",
+		Host:   "tzurl.org",
+		Path:   fmt.Sprintf("/zoneinfo/%s", t.Id),
+	})
+	return t
+}