Convert odd Stata string variable to date -

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i have economic data in format yyyy.qx q indicates "quarter" followed x, in [1,4]. interpreted string.

i've tried use date(series, "ymd") , formatting command, encode function.

ideally, i'd end numerical variable indicating like:

  • yyyy.x
  • yyyy.m, "m" first month of quarter
  • yyyymm01, "mm" first month of quarter.

it's best show code tried , stata did or said in response.

such dates quarterly dates treating them else @ best indirect , @ worst quite wrong. 

. set obs 1 obs 0, 1  . gen example = "2013.q4"  . gen qdate = yq(real(substr(example, 1,4)),real(substr(example, -1,1)))  . list      +-----------------+     | example   qdate |     |-----------------|  1. | 2013.q4     215 |     +-----------------+  . format qdate %tq   . list      +------------------+     | example    qdate |     |------------------|  1. | 2013.q4   2013q4 |     +------------------+

note code indicating date daily date can wrong. encode (incidentally not function, command) cannot here unless specify every string date explicitly value label.

update note function date() not all-purpose function creating kind of date: daily dates. there in fact synonym daily().

this example shows using quarterly() possibility. 

. di quarterly(substr("2013.q4", 1,4) + " " + substr("2013.q4", -1,1), "yq") 215

for variable series containing such string dates, go 

. gen qdate = quarterly(substr(series, 1, 4)) + " " + substr(series, -1, 1), "yq")  . format qdate %tq

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