| Format | Sample | Hyphens | Implied field(s) | Alternative | Wildcards | |
|---|---|---|---|---|---|---|
| -YY | -2 | -24 | 1 | century | none | XXYY, +XXXYY, –XXXYY, … |
| --MM | --2 | --04 | 2 | year | -MM | XXXXMM, *MM, *-MM, … |
| ---DD | ---2 | ---15 | 3 | month | --DD | **DD, *-*-DD, -XX-DD, XXXX-XX-DD, … |
| -DDD | -3 | -106 | 1* | year | same, DDD | *-DDD, *DDD, XXXXDDD, … |
| -WWW | -W2 | -W16 | 1 | year | same, WWW | *-WWW, *WWW, XXXX-WWW, … |
| -W-D | -W-1 | -W-1 | 2×1 | week | same | -WXX-D, *W*D, … |
| ---D | ---1 | ---1 | 3 | any week | --D, D | **D, *-*-D, … |
| -Y-WWW | -1-W2 | -4-W16 | 2×1 | decade | none | XXXY-WWW, … |
| -YWWW | -1W2 | -4W16 | 1 | decade | none | XXXYWWW, … |
| -mm | -2 | T-46 | 1 | hour | :mm | T*mm, *:mm, T*:mm, XX:mm, TXX:mm |
| --ss | --2 | T--16 | 2 | minute | ::ss | T**ss, *:*:ss, :*:ss, … |
| level of detail | full date | sample | |
|---|---|---|---|
| c | CC | 2 | 2024 |
| y | −CCYY | −4 | N/A |
| +CCYY | +4 | +2024 | |
| CCYY | 4 | 2024 | |
| d/y | ±CCYY-DDD | ±4-3 | 2024-105 |
| CCYYDDD | 7 | 2024105 | |
| m/y | ±CCYY-MM | ±4-2 | 2024-04 |
| invalid | |||
| d/m/y | ±CCYY-MM-DD | ±4-2-2 | 2024-04-15 |
| CCYYMMDD | 8 | 20240415 | |
| w/y | ±CCYY-WWW | ±4-W2 | 2024-W16 |
| ±CCYYWWW | ±4W2 | 2024W16 | |
| d/w/y | ±CCYY-WWW-D | ±4-W2-1 | 2024-W16-1 |
| ±CCYYWWWD | ±4W3 | 2024W161 | |