Below is the format of my data.

```
               Date Cashflow PublicHoliday  Day
    3279 2021-06-25 456.5812    Normal Day  Fri
    3280 2021-06-26 476.0169    Normal Day  Sat
    3281 2021-06-27 426.7399    Normal Day  Sun
    3282 2021-06-28 582.2945    Normal Day  Mon
    3283 2021-06-29 558.3888    Normal Day Tues
    3284 2021-06-30 607.9451    Normal Day  Wed

```

I would like to pick the Cashflow on 2021-06-25 and then replace it with something else.

I've tried something like this:

```
    dfOutflows$Date <- as.Date(dfOutflows$Date) 
    dfOutflows$Cashflow(as.Date"2021-30-06")

```