# TimeStandard

Core/TimeStandard.js 8
Provides the type of time standards which JulianDate can take as input.

##### Properties:

Name | Type | Description
--- | --- | ---
`UTC` | Number | Represents the coordinated Universal Time (UTC) time standard. UTC is related to TAI according to the relationship `UTC = TAI - deltaT` where `deltaT` is the number of leap seconds which have been introduced as of the time in TAI.
`TAI` | Number | Represents the International Atomic Time (TAI) time standard. TAI is the principal time standard to which the other time standards are related.

##### See:

- JulianDate

### Members

#### static constant Cesium.TimeStandard.TAI : Number
Core/TimeStandard.js 28

Represents the International Atomic Time (TAI) time standard. TAI is the principal time standard to which the other time standards are related.

Default Value: `1`

#### static constant Cesium.TimeStandard.UTC : Number
Core/TimeStandard.js 19

Represents the coordinated Universal Time (UTC) time standard. UTC is related to TAI according to the relationship `UTC = TAI - deltaT` where `deltaT` is the number of leap seconds which have been introduced as of the time in TAI.