# End of the month dating method. Grouping data sets by week number of the month | charles hooper's oracle notes

## Method to create end of month date from date variable in [r] data frame - Stack Overflow

For my project I'm reading in a csv russian translators in bangalore dating with data from every State in the US. Prefer formats resulting in valid dates over invalid ones.

The maturity date is not adjusted. There are several methods to do this. The above output has a slight problem — the Sunday in the first week of the month may not be in the month of interest; additionally, the Saturday in the last week of the month may not be in the month of interest.

Using that range we update the day by clamping the stored day of the month against the range. Even that I am not sure how to go about. For all other frequencies, dates are generated as usual, with no adjustment for weekends or holidays.

Strict parsing requires that the format and input match exactly, including delimeters.

## Save an hour of work a day with these 5 advanced Excel tricks

It's complex enough that it's essentially unchangeable in this scenario. How do i fix this issue. Determine the last date of the month Calculate the difference in days, between the date in question and the step 1 However, the difference is in how we determine the last date of the month.

This has been corrected. Business Day Convention Description end of month — no date adjustment Dates are generated according to the end-of-month rule described above.

### Related questions

To specify iso parsing use moment. The end-of-month adjustment methods provided are: Just let me know in the comments below.

Below is some sample data: Parsing two digit years By default, two digit years above 68 are assumed to be in the 's and years 68 or below are assumed to be in the 's. This can be changed by replacing the moment. My function converts each of these into a separate Dataframe as I need to perform operations on each State's information.

If the next good business day falls in the next month, the previous good business day is used.

## Gets the end of the month

Z ZZ were added in version 1. Haven't noticed a difference in speed when changed to a character vector. For example, the following behavior can be observed: Dimensions listed are taken from 1 example to show relative magnitude.

Like below in amazon Athena. Apply multiple ifelse in R data. The end of the first week will also be calculated, even though it is not used in later calculations.

Can I use R? Please Sign up or sign in to vote. By subtracting this from the date we just calculated the one that is a month aheadwe can get the last date of the month. That's where I suspect optimization might be of the most benefit. Any help would be appreciated.

I am adapting a pandas plotting example for my own data. Third Wednesday Conventions Two other date adjustment methods are provided, both relating to exchange traded contracts where trading stops two business days prior to the third Wednesday of the month, or on the third Wednesday of the month.

In a leap year, the end of month for February will be February So, given a date, how do you calculate the number of days remaining in the month?

### Generate Regular Sequences of Dates

Prefer formats earlier in the array than later. I have a question on converting a pandas dataframe column to the correct shape 101. Business Day Convention Description two business days prior to third Wednesday For annual, semi-annual, quarterly, or monthly frequencies, generated dates are adjusted to fall 2 business days prior to the third Wednesday of the month.

As you can see, the DaysRemaining changes according to the month. For more information about choosing strict vs forgiving parsing, see the parsing guide.

They work the same as the single format case. If so how do i do it.

## Useful NSDate and NSCalendar tricks

Generated dates are not adjusted for business days. Yes, this solution added 10 extra weeks to the year. Most of the variables listed below must be allowed to change in length depending on previous steps in the pipeline.

Note that the number of S characters provided is only relevant when parsing in strict mode.

## Old School Method to Calculate Last Day of Month

Parsing multiple formats is considerably slower than parsing a single format. They were added in version 2. Is there a query in Athena that I can write to achieve this result. Then use reshape2 package. End-of-month conventions will generate dates in the same way, except when the base date or cycle date falls on the last day of the month.

Interestingly, with the restrictions specified by the OP, there are 62 weeks this year.

If you need to call this at a high rate then I would recommend breaking out the logic so you do not need to allocate a new calendar etc each time.

If a generated date falls on a weekend or a holiday, the next good business day is used.

Determine the last date of the month Calculate the difference in days, between the date in question and the step 1 We can use the DATEDIFF function to calculate the difference in days, but how do you calculate the last day of the month?

What I am really looking for is the weeks within the calendar month. This generated date is ambiguous as both Aug and Aug seem reasonable. I have a [r] large data frame with date variables, which reflect first day of the month.

## Useful NSDate and NSCalendar tricks

What is the correct method for converting the column to the correct form? So which method should you use? Such a solution could be exponentially more efficient.

For example if we had a date that was the 31st of January and tried to go to the 31st of February we would end up with a date in March rather than at the end of February.

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