Timestamp class

A Timestamp represents a point in time independent of any time zone or local calendar, encoded as a count of seconds and fractions of seconds at nanosecond resolution. The count is relative to an epoch at UTC midnight on January 1, 1970, in the proleptic Gregorian calendar which extends the Gregorian calendar backwards to year one.

All minutes are 60 seconds long. Leap seconds are "smeared" so that no leap second table is needed for interpretation, using a 24-hour linear smear.

The range is from 0001-01-01T00:00:00Z to 9999-12-31T23:59:59.999999999Z. By restricting to that range, we ensure that we can convert to and from RFC 3339 date strings.

Examples

Example 1: Compute Timestamp from POSIX time().

 Timestamp timestamp;
 timestamp.set_seconds(time(NULL));
 timestamp.set_nanos(0);

Example 2: Compute Timestamp from POSIX gettimeofday().

 struct timeval tv;
 gettimeofday(&tv, NULL);

 Timestamp timestamp;
 timestamp.set_seconds(tv.tv_sec);
 timestamp.set_nanos(tv.tv_usec * 1000);

Example 3: Compute Timestamp from Win32 GetSystemTimeAsFileTime().

 FILETIME ft;
 GetSystemTimeAsFileTime(&ft);
 UINT64 ticks = (((UINT64)ft.dwHighDateTime) << 32) | ft.dwLowDateTime;

 // A Windows tick is 100 nanoseconds. Windows epoch 1601-01-01T00:00:00Z
 // is 11644473600 seconds before Unix epoch 1970-01-01T00:00:00Z.
 Timestamp timestamp;
 timestamp.set_seconds((INT64) ((ticks / 10000000) - 11644473600LL));
 timestamp.set_nanos((INT32) ((ticks % 10000000) * 100));

Example 4: Compute Timestamp from Java System.currentTimeMillis().

 long millis = System.currentTimeMillis();

 Timestamp timestamp = Timestamp.newBuilder().setSeconds(millis / 1000)
     .setNanos((int) ((millis % 1000) * 1000000)).build();

Example 5: Compute Timestamp from Java Instant.now().

 Instant now = Instant.now();

 Timestamp timestamp =
     Timestamp.newBuilder().setSeconds(now.getEpochSecond())
         .setNanos(now.getNano()).build();

Example 6: Compute Timestamp from current time in Python.

 timestamp = Timestamp()
 timestamp.GetCurrentTime()

JSON Mapping

In JSON format, the Timestamp type is encoded as a string in the RFC 3339 format. That is, the format is "{year}-{month}-{day}T{hour}:{min}:{sec}.{frac_sec}Z" where {year} is always expressed using four digits while {month}, {day}, {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. 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.

In JavaScript, one can convert a Date object to this format using the standard toISOString() method. In Python, a standard datetime.datetime object can be converted to this format using strftime with the time format spec '%Y-%m-%dT%H:%M:%S.%fZ'. Likewise, in Java, one can use the Joda Time's ISODateTimeFormat.dateTime() to obtain a formatter capable of generating timestamps in this format.

Inheritance

Object
GeneratedMessage
Timestamp

Constructors

Timestamp({Int64? seconds, int? nanos}): factory
Timestamp.fromBuffer(List<int> i, [ExtensionRegistry r = $pb.ExtensionRegistry.EMPTY]): factory
Timestamp.fromJson(String i, [ExtensionRegistry r = $pb.ExtensionRegistry.EMPTY]): factory

Properties

eventPlugin → EventPlugin?: Subclasses can override this getter to be notified of changes to protobuf fields.
no setterinherited
hashCode → int: Calculates a hash code based on the contents of the protobuf.
no setterinherited
info_ → BuilderInfo: no setteroverride
isFrozen → bool: Returns true if this message is marked read-only. Otherwise false.
no setterinherited
nanos ↔ int: Non-negative fractions of a second at nanosecond resolution. Negative second values with fractions must still have non-negative nanos values that count forward in time. Must be from 0 to 999,999,999 inclusive.
getter/setter pair
runtimeType → Type: A representation of the runtime type of the object.
no setterinherited
seconds ↔ Int64: Represents seconds of UTC time since Unix epoch 1970-01-01T00:00:00Z. Must be from 0001-01-01T00:00:00Z to 9999-12-31T23:59:59Z inclusive.
getter/setter pair
unknownFields → UnknownFieldSet: no setterinherited

Methods

addExtension(Extension extension, Object? value) → void: Adds an extension field value to a repeated field.
inherited
check() → void: inherited
clear() → void: Clears all data that was set in this message.
inherited
clearExtension(Extension extension) → void: Clears an extension field and also removes the extension.
inherited
clearField(int tagNumber) → void: Clears the contents of a given field.
inherited
clearNanos() → void
clearSeconds() → void
clone() → Timestamp: Creates a deep copy of the fields in this message. (The generated code uses mergeFromMessage.)
override
copyWith(void updates(Timestamp)) → Timestamp: Apply updates to a copy of this message.
override
createEmptyInstance() → Timestamp: Creates an empty instance of the same message type as this.
override
createMapField<K, V>(int tagNumber, MapFieldInfo<K, V> fi) → Map<K, V>: Creates a Map representing a map field.
inherited
createRepeatedField<T>(int tagNumber, FieldInfo<T> fi) → List<T>: Creates List implementing a mutable repeated field.
inherited
extensionsAreInitialized() → bool: inherited
freeze() → GeneratedMessage: Make this message read-only.
inherited
getDefaultForField(int tagNumber) → dynamic: Returns the default value for the given field.
inherited
getExtension(Extension extension) → dynamic: Returns the value of extension.
inherited
getField(int tagNumber) → dynamic: Returns the value of the field associated with tagNumber, or the default value if it is not set.
inherited
getFieldOrNull(int tagNumber) → dynamic: Returns the value of a field, ignoring any defaults.
inherited
getTagNumber(String fieldName) → int?: inherited
hasExtension(Extension extension) → bool: Returns true if a value of extension is present.
inherited
hasField(int tagNumber) → bool: Whether this message has a field associated with tagNumber.
inherited
hasNanos() → bool
hasRequiredFields() → bool: Whether the message has required fields.
inherited
hasSeconds() → bool
isInitialized() → bool: Whether all required fields in the message and embedded messages are set.
inherited
mergeFromBuffer(List<int> input, [ExtensionRegistry extensionRegistry = ExtensionRegistry.EMPTY]) → void: Merges serialized protocol buffer data into this message.
inherited
mergeFromCodedBufferReader(CodedBufferReader input, [ExtensionRegistry extensionRegistry = ExtensionRegistry.EMPTY]) → void: inherited
mergeFromJson(String data, [ExtensionRegistry extensionRegistry = ExtensionRegistry.EMPTY]) → void: Merges field values from data, a JSON object, encoded as described by GeneratedMessage.writeToJson.
inherited
mergeFromJsonMap(Map<String, dynamic> json, [ExtensionRegistry extensionRegistry = ExtensionRegistry.EMPTY]) → void: Merges field values from a JSON object represented as a Dart map.
inherited
mergeFromMessage(GeneratedMessage other) → void: Merges the contents of the other into this message.
inherited
mergeFromProto3Json(Object? json, {TypeRegistry typeRegistry = const TypeRegistry.empty(), bool ignoreUnknownFields = false, bool supportNamesWithUnderscores = true, bool permissiveEnums = false}) → void: Merges field values from json, a JSON object using proto3 encoding.
inherited
mergeUnknownFields(UnknownFieldSet unknownFieldSet) → void: inherited
noSuchMethod(Invocation invocation) → dynamic: Invoked when a nonexistent method or property is accessed.
inherited
setExtension(Extension extension, Object value) → void: Sets the value of a non-repeated extension field to value.
inherited
setField(int tagNumber, Object value) → void: Sets the value of a field by its tagNumber.
inherited
toBuilder() → GeneratedMessage: Creates a writable, shallow copy of this message.
inherited
toDateTime({bool toLocal = false}) → DateTime: Converts an instance to DateTime.
inherited
toDebugString() → String: Returns a String representation of this message.
inherited
toProto3Json({TypeRegistry typeRegistry = const TypeRegistry.empty()}) → Object?: Returns an Object representing Proto3 JSON serialization of this.
inherited
toString() → String: Returns a String representation of this message.
inherited
writeToBuffer() → Uint8List: inherited
writeToCodedBufferWriter(CodedBufferWriter output) → void: inherited
writeToJson() → String: Returns a JSON string that encodes this message.
inherited
writeToJsonMap() → Map<String, dynamic>: Returns the JSON encoding of this message as a Dart Map.
inherited

Operators

operator ==(Object other) → bool: The equality operator.
inherited

Static Methods

create() → Timestamp
createRepeated() → PbList<Timestamp>
fromDateTime(DateTime dateTime) → Timestamp: Creates a new instance from dateTime.
getDefault() → Timestamp