Command to get time in milliseconds

Question

date +"%T.%N" returns the current time with nanoseconds.
```
06:46:41.431857000
```
date +"%T.%6N" returns the current time with nanoseconds rounded to the first 6 digits, which is microseconds.
```
06:47:07.183172
```
date +"%T.%3N" returns the current time with nanoseconds rounded to the first 3 digits, which is milliseconds.
```
06:47:42.773
```

In general, every field of the date command’s format can be given an optional field width.