# Mark sas dating

### Index

- How do you read a date and time in SAS?
- How reliable are SAS date values?
- How do I convert two-digit dates to SAS date values?
- What is the default date range for year cut off in SAS?
- What is a datetime value in SAS?
- How do you find the day of the month in SAS?
- How does SAS keep track of dates and times?
- What is a format in SAS?
- What is a datetime value in SAS?
- How do I handle data with two-digit years in SAS?
- How do you format a newdate in SAS?
- Why are dates not showing up in my SAS data set?
- What is the default yearcutoff value in SAS 9?
- What is the range of dates that SAS can perform calculations?
- Why are dates not showing up in my SAS data set?
- What is a format in SAS?

### How do you read a date and time in SAS?

Informats read notations or a value, such as a clock time or a calendar date, which might be in a variety of lengths, and then convert the data to a SAS date, time, or datetime value. SAS can read date and time values that are delimited by the following characters: ! # $ % & ( ) * + - .

### How reliable are SAS date values?

SAS date values account for all leap year days, including the leap year day in the year 2000. SAS date values can reliably tell you what day of the week a particular day fell on as far back as September 1752, when the calendar was adjusted by dropping several days.

### How do I convert two-digit dates to SAS date values?

Store dates as SAS date values, not as simple numeric or character values. Use the YEARCUTOFF= system option when converting two-digit dates to SAS date values. Examine sets of raw data coming into your SAS process to make sure that any dates containing two-digit years will be correctly interpreted by the YEARCUTOFF= system option.

### What is the default date range for year cut off in SAS?

In Releases 6.06 through 6.12 of SAS, the default value for the YEARCUTOFF= system option is 1900; starting with SAS 7, the default value is 1920. For more information on how SAS handles dates, see the section on dates, times, and datetime values.

### What is a datetime value in SAS?

SAS datetime value is a value representing the number of seconds between January 1, 1960 and an hour/minute/second within a specified date. The following figure shows some dates written in calendar form and as SAS date values.

### How do you find the day of the month in SAS?

Given a SAS date value, the DAY function extracts the day of the month as a numeric value (between 1-31). Syntax DAY(date); Where date is a SAS date value that is specified either as a variable or as a SAS date constant. Example DATA sample; SET sample; days = DAY(DOB); RUN;

### How does SAS keep track of dates and times?

(January 1, 1960 and Midnight as Zero) SAS has three separate counters that keep track of dates and times. The date counter started at zero on January 1, 1960. Any day before 1/1/1960 is a negative number, and any day after that is a positive number. Every day at midnight, the date counter is increased by one.

### What is a format in SAS?

Informats and Formats SAS converts date, time, and datetime values back and forth between calendar dates and clock times with SAS language elements called formats and informats. Formats present a value, recognized by SAS, such as a time or date value, as a calendar date or clock time in a variety of lengths and notations.

### newdate = date; format newdate mmddyy10.; Or do you want it to be the string representation? Then do: newdate = put(date,yymmdd10.); which creates a character variable. Do you want it to be a SAS date variable with the proper format? Then do: newdate = date; format newdate mmddyy10.;

Why are dates not showing up in my SAS data set?

### What is the default yearcutoff value in SAS 9?

Note that while the default value of the YEARCUTOFF= option in SAS 9 is 1920, you can adjust the YEARCUTOFF= value in a DATA step to accommodate the range of date values you are working with at the moment.

### What is the range of dates that SAS can perform calculations?

SAS can perform calculations on dates ranging from A.D. 1582 to A.D. 19,900. Dates before January 1, 1960, are negative numbers; dates after are positive numbers. SAS date values account for all leap year days, including the leap year day in the year 2000.

### Why are dates not showing up in my SAS data set?

Make sure that output SAS data sets represent dates as SAS date values. Check your SAS programs to make sure that formats and informats that use two-digit years, such as DATE7., MMDDYY6., or MMDDYY8., are reading and writing data correctly. Note: The YEARCUTOFF= option has no effect on dates that are already stored as SAS date values.

### What is a format in SAS?

Informats and Formats SAS converts date, time, and datetime values back and forth between calendar dates and clock times with SAS language elements called formats and informats. Formats present a value, recognized by SAS, such as a time or date value, as a calendar date or clock time in a variety of lengths and notations.