I am using spreadsheet (1.0.3) and I am trying to read the date from a cell that has a =TODAY() formula in it. This is what I've tried so far:
require 'spreadsheet'
require 'date'
Spreadsheet.client_encoding = 'UTF-8'
book = Spreadsheet.open 'document.xls', 'rb'
sheet1 = book.worksheet 0
puts sheet1.row(0)[0].value # => 42167.0
I get 42167.0 when the date returned value for the =TODAY() formula in the spreadsheet is 2015-06-12, for 2015-06-13 I get 42168.0. The thing is that I am not seing a way to convert this number to a Date object.
Any DATETIME in excel is stored as DAY.Hour format (with 0.0 being 00 Jan 1900).
See: https://stackoverflow.com/a/14597674/91830
Related
I'm trying to create a currency converter in Ruby which will calculate the exchange rate between two currencies on a given date.
I have a data file containing test data (date, currency from, currency to). The test data is in EUR, so all rates are converted to EUR and then to the target currency.
So far I have 3 files (Exchange.rb, Test_Exchange.rb, rates.json):
Exchange.rb:
require 'json'
require 'date'
module Exchange
# Return the exchange rate between from_currency and to_currency on date as a float.
# Raises an exception if unable to calculate requested rate.
# Raises an exception if there is no rate for the date provided.
#rates = JSON.parse(File.read('rates.json'))
def self.rate(date, from_currency, to_currency)
# TODO: calculate and return rate
rates = u/rates[date] # get rates of given day
from_to_eur = 1.0 / rates[from_currency] # convert to EUR
from_to_eur * rates[to_currency] # convert to target currency
end
end
Test_Exchange.rb:
require_relative 'Exchange.rb'
require 'date'
target_date = Date.new(2018,12,10).to_s
puts "USD to GBP: #{Exchange.rate(target_date, 'USD', 'GBP')}"
puts "USD to JPY: #{Exchange.rate(target_date, 'PLN', 'CHF')}"
puts "DKK to CAD: #{Exchange.rate(target_date, 'PLN', 'CHF')}"
rates.json:
{
"2018-12-11": {
"USD": 1.1379,
"JPY": 128.75,
"BGN": 1.9558,
"CZK": 25.845,
"DKK": 7.4641,
"GBP": 0.90228,
"HUF": 323.4,
"CHF": 1.1248,
"PLN": 4.2983
},
"2018-12-10": {
"USD": 1.1425,
"JPY": 128.79,
"BGN": 1.9558,
"CZK": 25.866,
"DKK": 7.4639,
"CAD": 1.5218,
"GBP": 0.90245,
"HUF": 323.15,
"PLN": 4.2921,
"CHF": 1.1295,
"ISK": 140.0,
"HRK": 7.387,
"RUB": 75.8985
},
"2018-12-05": {
"USD": 1.1354,
"JPY": 128.31,
"BGN": 1.9558,
"CZK": 25.886,
"DKK": 7.463,
"GBP": 0.88885,
"HUF": 323.49,
"PLN": 4.2826,
"RON": 4.6528,
"SEK": 10.1753,
"CHF": 1.1328,
"HRK": 7.399,
"RUB": 75.8385,
"CAD": 1.5076
}
}
I'm not sure what to add in the Exchange.rb file to allow the user to input a date and the two currencies to compare exchange rates.
Running Exchange.rb does nothing. I'm guessing it wants a date and currency parameters input?
Running Test_Exchange.rb works because the date and currencies are bootstrapped in.
I found almost the same question posted here a couple years ago, but the thread is now closed, and the solution was incomplete. Hoping someone can help me!
RUNNING EDIT:
Exchange.rb:
require 'json'
require 'date'
module Exchange
# Return the exchange rate between from_currency and to_currency on date as a float.
# Raises an exception if unable to calculate requested rate.
# Raises an exception if there is no rate for the date provided.
#rates = JSON.parse(File.read('rates.json'))
#Grab Date and Currencies from User
puts "Please enter a Date (YYYY-MM-DD)"
input_date = gets.chomp
puts "The Date you entered is: #{input_date}"
puts "Please enter a 3-letter Currency Code (ABC):"
input_curr_1 = gets.chomp
puts "The 1st Currency you entered is: #{input_curr_1}"
puts "Please enter a 2nd 3-letter Currency Code (XYZ):"
input_curr_2 = gets.chomp
puts "The 2nd Currency you entered is: #{input_curr_2}"
def self.rate(input_date, input_curr_1, input_curr_2)
# TODO: calculate and return rate
rates = #rates[input_date] # get rates of given day
from_to_eur = 1.0 / rates[input_curr_1] # convert to EUR
from_to_eur * rates[input_curr_2] # convert to target currency
end
end
I think I have to use a put and a get to capture the user date input? Then the same for each of the two currencies? Of course, my syntax for the date stuff is all wrong..
So I managed to use the gets and put functions. Now all that's left is somehow calling the rates.json file and comparing the user inputs to the existing data..
Hi I would like to subtract time from a CSV array using Ruby
time[0] is 12:12:00AM
time[1] is 12:12:01AM
Here is my code
time_converted = DateTime.parse(time)
difference = time_converted[1].to_i - time_converted[0].to_i
p difference
However, I got 0
p time[0].to_i gives me 12
is there a way to fix this?
You can use Time#strptime to define the format of the parsed string.
In your case the string is %I:%M:%S%p.
%I = 12 hour time
%M = minutes
%S = seconds
%p = AM/PM indicator
So to parse your example:
require 'time'
time = %w(12:12:00AM 12:12:01AM)
parsed_time = time.map { |t| Time.strptime(t, '%I:%M:%S%p').to_i }
parsed_time.last - parsed_time.first
=> 1
Use the Ruby DateTime class and parse your dates into objects of that class.
My project is supposed to fetch specific values from multiple hashes a put those values in a text file. Ideally what I need my code to do is to have every date for the employees be seven days apart, so the text file would look something like this:
"Rachel Thorndike
2017-10-09-T04:29:46-05:00
Stacie Smith
2017-10-16-T04:29:46-05:00"
What this is supposed to do is fetch employee's names and put the time of their "handoff" on the line under them. I looked online and found the DateTime that Ruby features but it looks like whatever I do isn't working. My code is this:
require 'date'
jsonUser["users"].each do |user|
somefile.puts user["user"]["summary"]
print 'Handoff Date + Time: '
parsed = DateTime.strptime(jsonUser["start"], '%d-%m-%Y %H:%M')
utc = parsed.next_day(7).strftime('%d-%m-%Y %H:%M')
puts utc
end
But terminal returns this code with an error 'strptime': invalid date (ArgumentError). Would anybody help me get this code to work the way I want to? Anything that points me to the right direction? With explanations, if it isn't too much.
Thank you so much!
Update
I was able to get the iso8601 to appear under their name. My new code is
require 'date'
jsonUser["users"].each do |user|
somefile.puts user["user"]["summary"]
print 'Handoff Date + Time: '
parsed = DateTime.iso8601(jsonUser["start"])
utc = parsed.next_day(7).iso8601
somefile.puts utc
end
BUT the .next_day method isn't increasing by 7 days that I want too. Thought? I have only got one value that is appearing and that is going under every line. Its the value of jsonUser["start"] + 7 days...so `2017-
10-16T04:29:46-05:00`
This is what parse.next_day(7) gives me.
"Sr Chid
Handoff Date + Time: 2017-10-16T04:29:46-05:00
Ash A
Handoff Date + Time: 2017-10-16T04:29:46-05:00
Ven D
Handoff Date + Time: 2017-10-16T04:29:46-05:00
Abhi S
Handoff Date + Time: 2017-10-16T04:29:46-05:00"
The value of jsonUser["start"] is 2017-10-09T04:29:46-05:00 so the good thing is that it did increase by 7 but it only did it once.
Update for Amadan
require 'date'
date = DateTime.iso8601(jsonUser["start"])
jsonUser["users"].each do |user|
if user["user"]["self"] == nil
nil
else
somefile.puts user["user"]["summary"].gsub(/\w+/, &:capitalize).gsub(/[.]/, ' ')
somefile.print 'Handoff Date + Time: '
date = date.next_day(7)
somefile.puts date.iso8061
end
end
I have a datestring in this format
yyyy-mm-ddThh:mm:ss[Z]
And i have a timezone string. for e.g "Asia/Kolkata"
Now i want to convert this date string into the timezone of the given timezone
for e.g. if the date is 2014-01-03T23:30:00Z , then in "Asia/Kolkata" timezone it will be 2014-01-04T05:00:00 .
I tried using Time library , but Time library does not seem to have any method which can convert to other timzone http://ruby-doc.org/core-1.8.6/Time.html#method-c-mktime .
You should use the TZInfo gem.
require 'tzinfo'
tz = TZInfo::Timezone.get('Asia/Kolkata')
utc = DateTime.iso8601('2014-01-03T23:30:00Z')
local = tz.utc_to_local(utc)
If it just a ruby project without rails, also you do not want to install third party gems.
Then you have to do it yourself, the following is what I did:
def convert_time_to_timezone(time, timezone)
timezone_in_hours = timezone.to_i
time_in_seconds = time.to_i
time_in_seconds_in_timezone = time_in_seconds + timezone_in_hours*3600
utc_time = Time.at(time_in_seconds_in_timezone).utc
Time.new(utc_time.year, utc_time.month, utc_time.day, utc_time.hour, utc_time.min, utc_time.sec, "#{timezone}:00")
end
Just provide time (e.g., Time.now) and timezone (e.g., "+11:00", or "-05:00")
it will return the time with the specified timezone.
example:
call convert_time_to_timezone(Time.now, "+11:00") it will return something like
2017-05-31 18:17:13 +1100
If it has rails installed, then you can directly call in_time_zone('"Central Time (US & Canada)"')
I am fetching data from a mysql database in a non rails project using ruby. The data has a TIMESTAMP type, how can I convert it to a ruby date/time object so that I can do date comparisons on it?
These are some of the values coming from the db:
2014-03-17 22:56:02
2011-05-17 21:46:22
Use ::strptime
require 'date'
string = '2014-03-17 22:56:02'
DateTime.strptime(string, "%Y-%m-%d %H:%M:%S")
# => #<DateTime: 2014-03-17T22:56:02+00:00 ((2456734j,82562s,0n),+0s,2299161j)>
Try this
t = Time.at(<msqlTimestamp>)
puts t.to_date