chore: sync to googleapis master (#68)

add datetime.proto.

google/type/datetime.proto

@@ -0,0 +1,97 @@
+// 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;
+
+import "google/protobuf/duration.proto";
+
+option cc_enable_arenas = true;
+option go_package = "google.golang.org/genproto/googleapis/type/datetime;datetime";
+option java_multiple_files = true;
+option java_outer_classname = "DateTimeProto";
+option java_package = "com.google.type";
+option objc_class_prefix = "GTP";
+
+// Represents civil time in one of a few possible ways:
+//
+//  * When utc_offset is set and time_zone is unset: a civil time on a calendar
+//    day with a particular offset from UTC.
+//  * When time_zone is set and utc_offset is unset: a civil time on a calendar
+//    day in a particular time zone.
+//  * When neither time_zone nor utc_offset is set: a civil time on a calendar
+//    day in local time.
+//
+// The date is relative to the Proleptic Gregorian Calendar.
+//
+// If year is 0, the DateTime is considered not to have a specific year. month
+// and day must have valid, non-zero values.
+//
+// This type is more flexible than some applications may want. Make sure to
+// document and validate your application's limitations.
+message DateTime {
+  // Optional. Year of date. Must be from 1 to 9999, or 0 if specifying a
+  // datetime without a year.
+  int32 year = 1;
+
+  // Required. Month of year. Must be from 1 to 12.
+  int32 month = 2;
+
+  // Required. Day of month. Must be from 1 to 31 and valid for the year and
+  // month.
+  int32 day = 3;
+
+  // Required. Hours of day in 24 hour format. Should be from 0 to 23. An API
+  // may choose to allow the value "24:00:00" for scenarios like business
+  // closing time.
+  int32 hours = 4;
+
+  // Required. Minutes of hour of day. Must be from 0 to 59.
+  int32 minutes = 5;
+
+  // Required. Seconds of minutes of the time. Must normally be from 0 to 59. An
+  // API may allow the value 60 if it allows leap-seconds.
+  int32 seconds = 6;
+
+  // Required. Fractions of seconds in nanoseconds. Must be from 0 to
+  // 999,999,999.
+  int32 nanos = 7;
+
+  // Optional. Specifies either the UTC offset or the time zone of the DateTime.
+  // Choose carefully between them, considering that time zone data may change
+  // in the future (for example, a country modifies their DST start/end dates,
+  // and future DateTimes in the affected range had already been stored).
+  // If omitted, the DateTime is considered to be in local time.
+  oneof time_offset {
+    // UTC offset. Must be whole seconds, between -18 hours and +18 hours.
+    // For example, a UTC offset of -4:00 would be represented as
+    // { seconds: -14400 }.
+    google.protobuf.Duration utc_offset = 8;
+
+    // Time zone.
+    TimeZone time_zone = 9;
+  }
+}
+
+// Represents a time zone from the
+// [IANA Time Zone Database](https://www.iana.org/time-zones).
+message TimeZone {
+  // IANA Time Zone Database time zone, e.g. "America/New_York".
+  string id = 1;
+
+  // Optional. IANA Time Zone Database version number, e.g. "2019a".
+  string version = 2;
+}