Type alias ISODay

ISODay: `0${Exclude<Digit, 0>}` | `1${Digit}` | `2${Digit}` | `3${0 | 1}`

ISO day value ("01" to "31").

Example

const day01: ISODay = "01";
const day15: ISODay = "15";
const day31: ISODay = "31";