> ## Documentation Index
> Fetch the complete documentation index at: https://docs.gobl.org/llms.txt
> Use this file to discover all available pages before exploring further.

# Timestamp

RFC3339 timestamp in UTC with a Z suffix and optional sub-second precision, for example: 2021-05-26T13:45:00.000Z

## Schema ID

`https://gobl.org/draft-0/cal/timestamp`

## Validation Rules

| Field                    | Test                                                | Validation Code / Message                      |
| ------------------------ | --------------------------------------------------- | ---------------------------------------------- |
| <small>Timestamp</small> | <ul class="gobl-test"><li>Valid timestamp</li></ul> | `GOBL-CAL-TIMESTAMP-01`<br />Invalid timestamp |