[API reference](https://evolu.dev/docs/api-reference) › [@evolu/common](https://evolu.dev/docs/api-reference/common) › [Types](https://evolu.dev/docs/api-reference/common/Types) › Digit1To23

```ts
type Digit1To23 = Digit1To9 | `1${Digit}` | `2${"0" | "1" | "2" | "3"}`;
```

Defined in: [packages/common/src/Types.ts:271](https://github.com/evoluhq/evolu/blob/e7144e2bbe9069362b62dec1b64a8aa922b8f1b0/packages/common/src/Types.ts#L271)

Numeric string 1-23. Useful for hours validation.