# Can Stata read dates?

## Can Stata read dates?

Full documentation on Stata’s date and time capabilitiesâ€”including documentation on relevant functions and display formatsâ€”can be found in [D] datetime. Stata can work with dates such as 21nov2006, with times such as 13:42:02.213, and with dates and times such as 21nov2006 13:42:02.213.

## What is a date variable?

Date variables are numeric variables in SPSS, and as such, they can be added, subtracted, etc. Specifically, date variables in SPSS are the number of seconds since the beginning of the Gregorian calendar, which was October 14, 1582.

**How do I change the date format in Stata?**

Converting Numbers to Dates To convert such dates to Stata dates, use the mdy function. It takes three numeric arguments: the month, day and year to be converted.

**How do you format a date variable?**

Following gives output as 20121212. DateTime dd = new DateTime(2012, 12, 12); string val = String. Format(“{0:yyyyMMdd}”, dd);

### How do dates work in Stata?

A Stata date is simply a number, but with the %td format applied Stata will interpret that number as “number of days since January 1, 1960.” You can then use that number in a variety of ways. Stata has similar tools that measure time in terms of milliseconds, months, quarters, years and more.

### How do you code dates?

Code identifies dates following the W3C profile of ISO 8601, Date and Time Formats, that specifies the pattern: YYYY-MM-DD. If hours, minutes, and seconds are also needed the following pattern is used: YYYY-MM-DDThh:mm:ss.

**What kind of data is date?**

They are ordinal, as one date is bigger than the date before it. It is also quantitative as it can added, subtracted…etc.

**What type of variable is date in SPSS?**

numeric variable

In SPSS, date-time variables are treated as a special type of numeric variable. All SPSS date-time variables, regardless of whether they’re a date or a duration, are stored in SPSS as the number of seconds since October 14, 1582. This means that “under the hood”, date-time variables are actually integers!

#### What is the standard format of date data type?

This includes: (1) the standard format for dates and times (YYYY-MM-DD HH:MM:SS:mmm, with the time in 24-hour format); (2) MM/DD/YYYY, the format used in the database; (3) the default formats set up by Eloqua (as long as they are not modified or deleted by the Customer Administrator); or (4) any of the additional …

#### What is a date code?

Date codes are used to determine when a product was manufactured. The first two digits indicate the year while the 3rd and 4th digits indicate the week of manufacture. The date code can be found printed on the product label.

**How do you convert year to date in Stata?**

Another common scenario gives you dates as three separate numeric variables, one for the year, one for the month and one for the day. The year, month and day variables in the example data set contain the same date as the others but in this format. To convert such dates to Stata dates, use the mdy function.

**What does an elapsed date in Stata mean?**

An elapsed date is the number of days from January 1, 1960. In this format, Stata provides functions to convert dates into elapsed dates, formats to print elapsed dates in understandable forms, and other functions to manipulate elapsed dates.

## Are there any human readable dates in Stata?

While the four date variables you’ve created are perfectly functional dates as far as Stata is concerned, they’re difficult for humans to interpret. However, the %td format tells Stata to print them out as human readable dates:

## When to use upper or lower case dates in Stata?

In Stata 9 it should be lower case (e.g., “dmy”) and in Stata 10, it should be upper case for day, month, and year (e.g., “DMY”) but lower case if you want to specify hours, minutes or seconds (e.g., “DMYhms”).