A Timestamp represents a point in time independent of any time zone
or calendar, represented as seconds and fractions of seconds at
nanosecond resolution in UTC Epoch time. It is encoded using the
Proleptic Gregorian Calendar which extends the Gregorian calendar
backwards to year one. It is encoded assuming all minutes are 60
seconds long, i.e. leap seconds are "smeared" so that no leap second
table is needed for interpretation. 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.
See https://www.ietf.org/rfc/rfc3339.txt.

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 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()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/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.

Generated from protobuf message google.protobuf.Timestamp

CloneableInstantiable
ExtendsGoogle\Protobuf\Internal\Message
Methods
public __construct( $data = NULL)
 

Constructor.

    public Google\Protobuf\Internal\Message::byteSize()
     
    • ignore
    public Google\Protobuf\Internal\Message::clear()
     

    Clear all containing fields.

    • return
    public Google\Protobuf\Internal\Message::discardUnknownFields()
     

    Clear all unknown fields previously parsed.

    • return
    public fromDateTime(DateTime $datetime)
    public getNanos()
     

    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.

    Generated from protobuf field int32 nanos = 2;

    • return int
    public getSeconds()
     

    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.

    Generated from protobuf field int64 seconds = 1;

    • return int|string
    public Google\Protobuf\Internal\Message::jsonByteSize()
     
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    public Google\Protobuf\Internal\Message::mergeFrom( $msg)
     

    Merges the contents of the specified message into current message.

    This method merges the contents of the specified message into the
    current message. Singular fields that are set in the specified message
    overwrite the corresponding fields in the current message. Repeated
    fields are appended. Map fields key-value pairs are overwritten.
    Singular/Oneof sub-messages are recursively merged. All overwritten
    sub-messages are deep-copied.

    • return
    public Google\Protobuf\Internal\Message::mergeFromJsonString( $data, $ignore_unknown = false)
     

    Parses a json string to protobuf message.

    This function takes a string in the json wire format, matching the
    encoding output by serializeToJsonString().
    See mergeFrom() for merging behavior, if the field is already set in the
    specified message.

    • return
    • throws Exception Invalid data.
    public Google\Protobuf\Internal\Message::mergeFromString( $data)
     

    Parses a protocol buffer contained in a string.

    This function takes a string in the (non-human-readable) binary wire
    format, matching the encoding output by serializeToString().
    See mergeFrom() for merging behavior, if the field is already set in the
    specified message.

    • return
    • throws Exception Invalid data.
    public Google\Protobuf\Internal\Message::parseFromJsonStream( $input, $ignore_unknown)
     
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    public Google\Protobuf\Internal\Message::parseFromStream( $input)
     
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    public Google\Protobuf\Internal\Message::serializeToJsonStream( $output)
     
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    public Google\Protobuf\Internal\Message::serializeToJsonString()
     

    Serialize the message to json string.

    • return string Serialized json protobuf data.
    public Google\Protobuf\Internal\Message::serializeToStream( $output)
     
    • ignore
    public Google\Protobuf\Internal\Message::serializeToString()
     

    Serialize the message to string.

    • return string Serialized binary protobuf data.
    public setNanos( $var)
     

    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.

    Generated from protobuf field int32 nanos = 2;

    • return $this
    public setSeconds( $var)
     

    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.

    Generated from protobuf field int64 seconds = 1;

    • return $this
    public toDateTime()
     

    Converts Timestamp to PHP DateTime.

    • return DateTime $datetime
    Methods
    protected Google\Protobuf\Internal\Message::mergeFromArray(array $array)
     

    Populates the message from a user-supplied PHP array. Array keys
    correspond to Message properties and nested message properties.

    Example:

    $message->mergeFromArray([
        'name' => 'This is a message name',
        'interval' => [
             'startTime' => time() - 60,
             'endTime' => time(),
        ]
    ]);
    

    This method will trigger an error if it is passed data that cannot
    be converted to the correct type. For example, a StringValue field
    must receive data that is either a string or a StringValue object.

    • return
    protected Google\Protobuf\Internal\Message::mergeFromJsonArray( $array, $ignore_unknown)
    protected Google\Protobuf\Internal\Message::readOneof( $number)
    protected Google\Protobuf\Internal\Message::readWrapperValue( $member)
    protected Google\Protobuf\Internal\Message::whichOneof( $oneof_name)
    protected Google\Protobuf\Internal\Message::writeOneof( $number, $value)
    protected Google\Protobuf\Internal\Message::writeWrapperValue( $member, $value)
    Properties
    private $nanos
     

    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.

    Generated from protobuf field int32 nanos = 2;

    private $seconds
     

    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.

    Generated from protobuf field int64 seconds = 1;

    Methods
    private Google\Protobuf\Internal\Message::appendHelper( $field, $append_value)
    private Google\Protobuf\Internal\Message::convertJsonValueToProtoValue( $value, $field, $ignore_unknown, $is_map_key = false)
    private Google\Protobuf\Internal\Message::defaultValue( $field)
     
    • ignore
    private Google\Protobuf\Internal\Message::existField( $field)
     
    • ignore
    private Google\Protobuf\Internal\Message::fieldByteSize( $field)
     
    • ignore
    private Google\Protobuf\Internal\Message::fieldDataOnlyByteSize( $field, $value)
     
    • ignore
    private Google\Protobuf\Internal\Message::fieldDataOnlyJsonByteSize( $field, $value)
     
    • ignore
    private Google\Protobuf\Internal\Message::fieldJsonByteSize( $field)
     
    • ignore
    private Google\Protobuf\Internal\Message::initWithDescriptor(Google\Protobuf\Internal\Descriptor $desc)
     
    • ignore
    private Google\Protobuf\Internal\Message::initWithGeneratedPool()
     
    • ignore
    private Google\Protobuf\Internal\Message::kvUpdateHelper( $field, $update_key, $update_value)
    private Google\Protobuf\Internal\Message::mergeFromArrayJsonImpl( $array, $ignore_unknown)
    private static Google\Protobuf\Internal\Message::normalizeArrayElementsToMessageType( $value, $class)
     

    Tries to normalize the elements in $value into a provided protobuf
    wrapper type $class. If $value is any type other than array, we do
    not do any conversion, and instead rely on the existing protobuf
    type checking. If $value is an array, we process each element and
    try to convert it to an instance of $class.

      private static Google\Protobuf\Internal\Message::normalizeToMessageType( $value, $class)
       

      Tries to normalize $value into a provided protobuf wrapper type $class.

      If $value is any type other than an object, we attempt to construct an
      instance of $class and assign $value to it using the setValue method
      shared by all wrapper types.

      This method will raise an error if it receives a type that cannot be
      assigned to the wrapper type via setValue.

        private Google\Protobuf\Internal\Message::parseFieldFromStream( $tag, $input, $field)
         
        • ignore
        private static Google\Protobuf\Internal\Message::parseFieldFromStreamNoTag( $input, $field, $value)
         
        • ignore
        private Google\Protobuf\Internal\Message::repeatedFieldDataOnlyByteSize( $field)
         
        • ignore
        private Google\Protobuf\Internal\Message::serializeFieldToJsonStream( $output, $field)
         
        • ignore
        private Google\Protobuf\Internal\Message::serializeFieldToStream( $output, $field)
         
        • ignore
        private Google\Protobuf\Internal\Message::serializeMapFieldToStream( $field, $output)
         
        • ignore
        private Google\Protobuf\Internal\Message::serializeRepeatedFieldToStream( $field, $output)
         
        • ignore
        private Google\Protobuf\Internal\Message::serializeSingularFieldToStream( $field, $output)
         
        • ignore
        private Google\Protobuf\Internal\Message::skipField( $input, $tag)
         
        • ignore
        Methods
        private static Google\Protobuf\Internal\Message::normalizeArrayElementsToMessageType( $value, $class)
         

        Tries to normalize the elements in $value into a provided protobuf
        wrapper type $class. If $value is any type other than array, we do
        not do any conversion, and instead rely on the existing protobuf
        type checking. If $value is an array, we process each element and
        try to convert it to an instance of $class.

          private static Google\Protobuf\Internal\Message::normalizeToMessageType( $value, $class)
           

          Tries to normalize $value into a provided protobuf wrapper type $class.

          If $value is any type other than an object, we attempt to construct an
          instance of $class and assign $value to it using the setValue method
          shared by all wrapper types.

          This method will raise an error if it receives a type that cannot be
          assigned to the wrapper type via setValue.

            private static Google\Protobuf\Internal\Message::parseFieldFromStreamNoTag( $input, $field, $value)
             
            • ignore
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