umd not working in browser

### I'm Submitting a ...

```
[x] Bug report
[ ] Feature request
[ ] Support request
```

### Steps to Reproduce
```

```

### Expected Results
No console error

### Actual Results
```
Uncaught TypeError: c.a is undefined
DaysView.js:4
Webpack 7
n

n




[DaysView.js:4:29](webpack://Datetime/src/views/DaysView.js)
```

### Minimal Reproduction of the Problem

### Other Information (e.g. stacktraces, related issues, suggestions how to fix)