### Name: seq.Date
### Title: Generate Regular Sequences of Dates
### Aliases: seq.Date
### Keywords: manip chron

### ** Examples

## first days of years
seq(as.Date("1910/1/1"), as.Date("1999/1/1"), "years")
## by month
seq(as.Date("2000/1/1"), by="month", length.out=12)
## quarters
seq(as.Date("2000/1/1"), as.Date("2003/1/1"), by="3 months")

## find all 7th of the month between two dates, the last being a 7th.
st <- as.Date("1998-12-17")
en <- as.Date("2000-1-7")
ll <- seq(en, st, by="-1 month")
rev(ll[ll > st & ll < en])