datetime - Convert date variable to numeric -

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feels obvious question, stata hasn't yielded answers. stata users interested in converting non-date variable date variable, want opposite.

i have date variable date, type long, format %tdccyynn. i'm trying append dataset in same variable date type long , format %12.0g. accurately this, need convert date in first dataset %tdccyynn %12.0g. when format %12.0g date, date values change incorrect ones.

let's say, in first dataset, have date=201204. still want read 201204, %12.0g variable. there way this?

i +1 comments above nick , william , suggest read help datetime. have been using stata few years , still visit file. stata's date/time functionality fantastic , benefit learning earlier rather later.

i convert other data stata date format. really. if need convert %td date "integer yyyynn" date, pass through temporary file. if write %td date plain text, keep displayed format , can read integer yyyynn date.

// data matches decsription clear set obs 1 generate date = date("20120401", "ymd") format date %tdccyynn list  // write tempfile plain text tempfile plaintext outsheet using "`plaintext'"  // read dates integers preserve tempfile statadata insheet using "`plaintext'", clear rename date dateinteger save "`statadata'" restore  // merge original data merge 1:1 _n using "`statadata'" list describe

this yields following.

. list       +---------------------------------+      |   date   datein~r        _merge |      |---------------------------------|   1. | 201204     201204   matched (3) |      +---------------------------------+  . describe  contains data   obs:             1                            vars:             3                            size:             7                           -----------------------------------------------------------------------------------------------------               storage   display    value variable name   type    format     label      variable label ----------------------------------------------------------------------------------------------------- date            int     %tdccyynn              dateinteger     long    %12.0g                 _merge          byte    %23.0g     _merge      ----------------------------------------------------------------------------------------------------- sorted by:       note: dataset has changed since last saved.

but suggest take advantage of stata's date/time functionality.


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