Calculate number of Mondays since the start of the year

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I'd like to obtain, from today's date, how many Mondays have occurred during the year so far.

x <- Sys.Date()
format(x, "%V")

# [1] "02"

This returns a value of "02", telling me it is the second week of the year. However, what I need is a value of "01" telling me that only one Monday has occurred during the year so far.

Any ideas?

Here is a base R solution, using weekdays() + sum()

w <- weekdays(seq(as.Date("2020-01-01"),as.Date(Sys.Date()),by = "1 day"))
r <- sum(w == "måndag")

such that

> r
[1] 1

Since my system is in Swedish, so the key word for Monday is "måndag". You can check how weekdays gives for Monday according to the language of your system.

How many Mondays between two dates? [homework], To count weekdays (Mondays, Fridays, Sundays, etc.) In the generic version of the formula, start = start date, end = end date, and dow = day of week. The WEEKDAY function evaluates these numbers as dates and returns this array: {6;7 ;1� Year Date Month Since last Comment; 2015: Monday, June 1, 2015 2 times in year 2025: Monday, December 1, 2025: – Calculates number of days; Date Calculator

I think I've found an answer to my own question using Lubridate:

library(lubridate)

x <- Sys.Date()

start <- as.Date(cut(x, "month"))
end <- Sys.Date()
all_dates <- seq(from = start, to = end, by = "days")

week <- length(which(wday(all_dates)==2)) # number of Mondays in date sequence

In my particular case, I also needed a leading zero, so I could also do the following:

library(stringr)

week <- as.character(week)
week <- str_pad(week, 2, pad = "0")

week

#[1] "01"

Date Duration Calculator: Days Between Dates, Here is a base R solution, using weekdays() + sum() w <- weekdays(seq(as.Date ("2020-01-01"),as.Date(Sys.Date()),by = "1 day")) r <- sum(w� Today is Friday, August 7th, 2020. It is the 220th day of the year, and in the 32nd week of the year (assuming each week starts on a Monday). There are 31 days in this month. 2020 is a leap year, so there are 366 days in this year. ›› Date calculator. number of days in 2020 number of days in 2019 number of days in 2021 number of days in 1983

Here is a function built using lubridate, the idea is to build a vector of Monday dates and get how many time it occurred;

library(lubridate)

get_occurance <- function(date, weekday){
  # Get year of the date
  this_year <- paste0(year(date), "-01-01")

  # Create list of days
  all_dates <- strftime(as.Date(1:365, origin = this_year))

  # Create list of specific weekday
  weekday_days <- all_dates[strftime(all_dates,"%A") == weekday]

  # Return number
  which((weekday_days <= date) & weekday_days > as.character(ymd(date) %m-% days(7)))
}

# Try it with today
today <- Sys.Date()
get_occurance(today, "Monday")
[1] 1

# Try it with other dates
get_occurance(as.Date("2020-01-28"), "Monday")
[1] 4

get_occurance(as.Date("2020-01-27"), "Monday")
[1] 4 

Excel formula: Count day of week between dates, You can use this technique to also count the number of weekends, Mondays, Tuesdays or Duration: 6:27 Posted: 3 Jan 2019 Weekdays calculation: Mondays: 52 Tuesdays: 52 Wednesdays: 52 Thursdays: 52 Fridays: 53 Saturdays: 53 Sundays: 52 Working days: 261 Days in total: 366

Calculate number of Mondays since the start of the year, Public holidays aren't taken into account when calculating the working days, because they are handled very differently from country to country and from state to� Duration Between Two Dates – Calculates number of days. Date Calculator – Add or subtract days, months, years Birthday Calculator – Find when you are 1 billion seconds old

Count Day of Week Between Dates in Excel (How many Fridays , Count number of occurrences of a day between two dates What I need to do is identify the number of hours of care provided in a financial year. for 1.5 hours and using the same start and end dates as the example above, again day between the start date and end date of care (i.e. how many Mondays,� How to calculate total number of mondays or any other day in a specific period, for example how many saturdays are between 01/01/2011 to 12/31/2011. Moreover how to calculate number of working days in a specific period if working days are 6 or 4 instead of usual 5. Thanks

Calculate Number of Weekdays, I have two parameters for begin and end date. Is there someone who has been able to calculate the number of days of week between two date ranges You can count the number of occurrences of a specific day between 2 dates as follows:. Using WEEKDAY(A1,3) gives you 0 for Monday, then subtracting the two and dividing by 7: ((A2-..)-(A1-..))/7 gives the number of Mondays, but not if the first date A1 is a Monday, so we have to add 1 in that case. BTW what is the advantage of using the function QUOTIENT instead of simply dividing?

Comments
  • Try difftime(Sys.Date(), '2020-01-01') / 7 with ceil? There might be a more direct way though.