[R] Removing colon from numerical data

[LCOG1]

Basic question, looked through the forum and documentation but didnt see a
solution.

So consider 

O<-c(1:20)
D<-c("1:","2:","3:","4:","5:","6:","7:","8:","9:","10:","11:","12:","13:","14:","15:","16:",
"17:","18:","19:","20:")
Time<-c(51:70)

AveTT<-data.frame(O,D,Time)


I would like to remove the colon from the "D" column's data.  This is how
the data is being given to me and its too big to put into excel to remove
the colons.  I tried the below but neither returns what i want.  

AveTT$D<-as.numeric(AveTT$D)

AveTT$D<-substr(AveTT$D,1,nchar(AveTT$D)-1)

so i want 
  O   D Time
1   1  1:   51
2   2  2:   52
3   3  3:   53
4   4  4:   54
5   5  5:   55
6   6  6:   56
7   7  7:   57
8   8  8:   58
9   9  9:   59
10 10 10:   60

to become

  O   D Time
1   1  1   51
2   2  2   52
3   3  3   53
4   4  4   54
5   5  5   55
6   6  6   56
7   7  7   57
8   8  8   58
9   9  9   59
10 10 10   60

while maintaining the data's integrity.  Thanks 

JR

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