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DATEFRAC: Stata module to convert calendar dates to fractional years

Author

Listed:
  • Tommy Morgan

    (Brigham Young University)

Programming Language

Stata

Abstract

datefrac takes any variable that represents an exact date and generates a numeric variable representing the fraction of that year that has passed at the beginning of that date by taking the number of days since 1 January of a given year, dividing that number by 365, and adding the resulting fraction to the given year. For example, datefrac assigns the value 2020.000 (2020 + 0/365) to the date 1 January 2020 and the value 1999.17260 (1999 + 63/365) to the date 4 March 1999. It also accounts for leap years if the year is a multiple of 4, assigning the value 2000.17486 (2000 + 64/366) to the date 4 March 2000.

Suggested Citation

  • Tommy Morgan, 2023. "DATEFRAC: Stata module to convert calendar dates to fractional years," Statistical Software Components S459254, Boston College Department of Economics.
    • Handle: RePEc:boc:bocode:s459254
    Note: This module should be installed from within Stata by typing "ssc install datefrac". The module is made available under terms of the GPL v3 (https://www.gnu.org/licenses/gpl-3.0.txt). Windows users should not attempt to download these files with a web browser.
    as

    Download full text from publisher

    File URL: http://fmwww.bc.edu/repec/bocode/d/datefrac.ado
    File Function: program code
    Download Restriction: no
    File URL: http://fmwww.bc.edu/repec/bocode/d/datefrac.sthlp
    File Function: help file
    Download Restriction: no
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