The Time Synchronization cluster (0x0038) is a Matter cluster that Synchronizes device time with trusted time sources for accurate timestamps.. It defines 6 commands and 13 attributes and is mandatory for 2 device types.

Last updated 13 Jun 2026

Time Synchronization 0x0038

Global Cluster

Utility

Introduced in: Matter 1.0

Devices: 41

Synchronizes device time with trusted time sources for accurate timestamps.

Spec History

This cluster's ClusterRevision across the Matter releases it has shipped in. Click a version to inspect the cluster as it existed in that release.

Matter 1.0 Matter 1.1 Matter 1.2 rev 2 Matter 1.3 rev 2 Matter 1.4 rev 2 Matter 1.5 rev 2 Matter master rev 2

Attributes 13

Commands 6

Features 4

Code	Name	Type	Flags
0x0000	UTCTime nullable	epoch_us
0x0001	Granularity max 0x04 · default 0x00	GranularityEnum
0x0002	TimeSource max 0x10 · default 0x00	TimeSourceEnum	Optional
0x0003	TrustedTimeSource nullable	TrustedTimeSourceStruct	Optional
0x0004	DefaultNTP nullable	char_string	Optional
0x0005	TimeZone	array	Optional
0x0006	DSTOffset	array	Optional
0x0007	LocalTime nullable	epoch_us	Optional
0x0008	TimeZoneDatabase max 0x02 · default 2	TimeZoneDatabaseEnum	Optional
0x0009	NTPServerAvailable default 0	boolean	Optional
0x000A	TimeZoneListMaxSize 1..2	int8u	Optional
0x000B	DSTOffsetListMaxSize min 1	int8u	Optional
0x000C	SupportsDNSResolve default 0	boolean	Optional

Code	Name	Direction	Parameters
0x00	SetUTCTime invoke: administer This command is used to set the UTC time of the node.	client→server	`UTCTime`: epoch_us, `Granularity`: GranularityEnum, `TimeSource`: TimeSourceEnum
0x01	SetTrustedTimeSource Optional invoke: administer This command is used to set the TrustedTimeSource attribute.	client→server	`TrustedTimeSource`: FabricScopedTrustedTimeSourceStruct
0x02	SetTimeZone Optional invoke: manage This command is used to set the time zone of the node.	client→server	`TimeZone`: TimeZoneStruct
0x03	SetTimeZoneResponse Optional THis command is used to report the result of a SetTimeZone command.	server→client	`DSTOffsetRequired`: boolean
0x04	SetDSTOffset Optional invoke: manage This command is used to set the DST offsets for a node.	client→server	`DSTOffset`: DSTOffsetStruct
0x05	SetDefaultNTP Optional invoke: administer This command is used to set the DefaultNTP attribute.	client→server	`DefaultNTP`: char_string