ISO 8601 Guidance
Note: This table applies to DCAT-US 1.1. For DCAT-US 3.0, this ISO 8601 duration format is one of three accepted formats for accrualPeriodicity. See Migrating from DCAT-US v1.1 to v3.0 for what changed, and the DCAT-US 3.0 Dataset schema for the full field definition.
accrualPeriodicity
| Term | ISO-8601 |
|---|---|
| Decennial | R/P10Y |
| Quadrennial | R/P4Y |
| Annual | R/P1Y |
| Bimonthly | R/P2M or R/P0.5M |
| Semiweekly | R/P3.5D |
| Daily | R/P1D |
| Biweekly | R/P2W or R/P0.5W |
| Semiannual | R/P6M |
| Biennial | R/P2Y |
| Triennial | R/P3Y |
| Three times a week | R/P0.33W |
| Three times a month | R/P0.33M |
| Continuously updated | R/PT1S |
| Monthly | R/P1M |
| Quarterly | R/P3M |
| Semimonthly | R/P0.5M |
| Three times a year | R/P4M |
| Weekly | R/P1W |
| Hourly | R/PT1H |