--- /dev/null
+// Copyright 2019 Google LLC.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+syntax = "proto3";
+
+package google.type;
+
+option go_package = "google.golang.org/genproto/googleapis/type/calendarperiod;calendarperiod";
+option java_multiple_files = true;
+option java_outer_classname = "CalendarPeriodProto";
+option java_package = "com.google.type";
+option objc_class_prefix = "GTP";
+
+
+// A `CalendarPeriod` represents the abstract concept of a time period that has
+// a canonical start. Grammatically, "the start of the current
+// `CalendarPeriod`." All calendar times begin at midnight UTC.
+enum CalendarPeriod {
+ // Undefined period, raises an error.
+ CALENDAR_PERIOD_UNSPECIFIED = 0;
+
+ // A day.
+ DAY = 1;
+
+ // A week. Weeks begin on Monday, following
+ // [ISO 8601](https://en.wikipedia.org/wiki/ISO_week_date).
+ WEEK = 2;
+
+ // A fortnight. The first calendar fortnight of the year begins at the start
+ // of week 1 according to
+ // [ISO 8601](https://en.wikipedia.org/wiki/ISO_week_date).
+ FORTNIGHT = 3;
+
+ // A month.
+ MONTH = 4;
+
+ // A quarter. Quarters start on dates 1-Jan, 1-Apr, 1-Jul, and 1-Oct of each
+ // year.
+ QUARTER = 5;
+
+ // A half-year. Half-years start on dates 1-Jan and 1-Jul.
+ HALF = 6;
+
+ // A year.
+ YEAR = 7;
+}