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https://stackoverflow.com/questions/11922181/adding-time-to-posixct-object-in-r
POSIXct objects are a measure of seconds from an origin, usually the UNIX epoch (1st Jan 1970). Just add the requisite number of seconds to the object: x <- Sys.time() x [1] "2012-08-12 13:33:13 BST" x + 3*60*60 # add 3 hours [1] "2012-08-12 16:33:13 BST"
https://stackoverflow.com/questions/50866366/adding-time-to-time-in-r
When you use the format function, you create a character variable that cannot be sum. Therefore, I would suggest to keep then as POSIXt and use as character when necessary. Also, the minutes and hours functions from lubridate create a period object that is converted to a number when in a list (I don't completely understand this part here) and I could not sum using …
https://sodocumentation.net/r/topic/9027/date-time-classes--posixct-and-posixlt-
## adding/subtracting times - 60 seconds as.POSIXct("2016-01-01") + 60 # [1] "2016-01-01 00:01:00 AEDT" ## adding 3 hours, 14 minutes, 15 seconds as.POSIXct("2016-01-01") + ( (3 * 60 * 60) + (14 * 60) + 15) # [1] "2016-01-01 03:14:15 AEDT" More formally, as.difftime can be used to specify time periods to add to a date or datetime object. E.g.:
https://datacadamia.com/lang/r/posixct
R - Time representation in R with the POSIXct Date-Time Classes. See also: Time - (Unix|POSIX|Epoch) time Articles Related Management Generation seq.POSIXt generate Regular Sequences of Times Conversion From other classes For conversion to and from character representations.
https://riptutorial.com/r/example/9785/date-time-arithmetic
## adding/subtracting times - 60 seconds as.POSIXct("2016-01-01") + 60 # [1] "2016-01-01 00:01:00 AEDT" ## adding 3 hours, 14 minutes, 15 seconds as.POSIXct("2016-01-01") + ( (3 * 60 * 60) + (14 * 60) + 15) # [1] "2016-01-01 03:14:15 AEDT" More formally, as.difftime can be used to specify time periods to add to a date or datetime object. E.g.:
https://www.neonscience.org/resources/learning-hub/tutorials/dc-convert-date-time-posix-r
This tutorial explores working with date and time field in R. We will overview the differences between as.Date, POSIXct and POSIXlt as used to convert a date / time field in character (string) format to a date-time format that is recognized by R. This conversion supports efficient plotting, subsetting and analysis of time series data.
https://www.stat.berkeley.edu/~s133/dates.html
Dates and Times in R R provides several options for dealing with date and date/time data. The builtin as.Date function handles dates (without times); the contributed library chron handles dates and times, but does not control for time zones; and the POSIXct and POSIXlt classes allow for dates and times with control for time zones. The general rule for date/time data in R is to use …
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