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Typing for TimeString and DateString
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| type Digit = 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9; | |
| type H = `${0 | 1}${Digit}` | `${2}${0 | 1 | 2 | 3}`; | |
| type M = `${0 | 1 | 2 | 3 | 4 | 5}${Digit}`; | |
| type S = `${0 | 1 | 2 | 3 | 4 | 5}${Digit}`; | |
| export type TimeString = `${H}:${M}` | `${H}:${M}:${S}`; // 03:45 or 03:45:56 | |
| type Mo = Exclude<`0${Digit}` | `1${0 | 1 | 2}`, '00'>; | |
| type Da = Exclude<`${0 | 1 | 2}${Digit}` | `3${0 | 1}`, '00'>; | |
| export type DateString = `${number}-${Mo}-${Da}`; // 2017-02-23 |
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