convert date to unix time in R

Question

I want to convert "2013-09-16" into unix time.

I found Convert UNIX epoch to Date object in R but I need to do the reverse of that.

Thanks!

You don't have an object of `POSIXct` there, you have a `character` type object. You want `as.POSIXct()`. — Simon O'Hanlon, Jan 03 '14 at 19:13

score 85 · Accepted Answer · edited Jan 03 '14 at 19:19

85

Quite simple:

as.numeric(as.POSIXct("2013-09-16 2:13:46 EST"))

edited Jan 03 '14 at 19:19

Henrik

65,555
14
143
159

answered Jan 03 '14 at 19:14

hot_whisky

1,072
1
9
10

1

Does this approach consider summer-/winter time? – rmuc8 Aug 05 '15 at 15:36
@rmuc8 `EST` is standard time. If it was daylight time then it would be `EDT` – jaksco Nov 13 '22 at 19:05

score 14 · Answer 2 · answered Jan 03 '14 at 19:15

14

Simply cast to numeric:

as.numeric(as.POSIXct("2013-09-06", format="%Y-%m-%d"))
# [1] 1378418400

answered Jan 03 '14 at 19:15

Tomas

57,621
49
238
373

W_AC _ IA-Quant · Answer 3 · 2020-12-22T21:18:51.683

This tipe of time is useful for YahooFinance i'll leave you a code if you want to see 60 days before until today:

  window <- 60
  tempo<-as.character(Sys.time())
  substr(time, 12, 24) <- "00:00:00"
  tempo<-as.POSIXct(tempo)
  end_date <- ceiling(as.numeric(as.POSIXct(tempo)))
  start_date <- ceiling(as.numeric(as.POSIXct(tempo - window*86400)))

This code will give you an interval for download the time that you want.

WAC.

convert date to unix time in R

3 Answers3

Linked

Related