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-rw-r--r--csharp/src/Google.Protobuf/WellKnownTypes/Timestamp.cs4
1 files changed, 3 insertions, 1 deletions
diff --git a/csharp/src/Google.Protobuf/WellKnownTypes/Timestamp.cs b/csharp/src/Google.Protobuf/WellKnownTypes/Timestamp.cs
index 036be63f..332d74b6 100644
--- a/csharp/src/Google.Protobuf/WellKnownTypes/Timestamp.cs
+++ b/csharp/src/Google.Protobuf/WellKnownTypes/Timestamp.cs
@@ -101,7 +101,9 @@ namespace Google.Protobuf.WellKnownTypes {
/// {hour}, {min}, and {sec} are zero-padded to two digits each. The fractional
/// seconds, which can go up to 9 digits (i.e. up to 1 nanosecond resolution),
/// are optional. The "Z" suffix indicates the timezone ("UTC"); the timezone
- /// is required, though only UTC (as indicated by "Z") is presently supported.
+ /// is required. A proto3 JSON serializer should always use UTC (as indicated by
+ /// "Z") when printing the Timestamp type and a proto3 JSON parser should be
+ /// able to accept both UTC and other timezones (as indicated by an offset).
///
/// For example, "2017-01-15T01:30:15.01Z" encodes 15.01 seconds past
/// 01:30 UTC on January 15, 2017.