I have date values with the format d-m-yyyy in QGIS. They are in string field. I want to convert them into date values with the format yyyy-mm-dd. I want them in a date field.

Can this be done without doing something in Python?

  • Which software are you using or want to use? – pathmapper Jun 13 '18 at 12:23
  • Sorry, QGIS 3.0 – Rob Jun 13 '18 at 12:39
  • Can you give examples on how your data looks if your format is d-m-yyyy please? Do you have dates like 1-2-2013 instead of 01-02-2013? – Joseph Jun 13 '18 at 12:55
  • Yes, that's correct! The answer of @Kazuhito down here works perfect btw! – Rob Jun 13 '18 at 13:15
  • @Rob - Great! Don't forget to accept his answer by clicking the green-faded tick on the left-hand side :) – Joseph Jun 13 '18 at 13:22

I would recommend to use the Field calculator.

Expression would be:

  concat(regexp_substr("old_date", '([^-]+$)'), 
         lpad(regexp_substr("old_date", '[-](\\d*)[-]'), 2, 0), 
         lpad(regexp_replace("old_date", '([-].*$)', ''), 2, 0)

Please replace "old_date" by your actual string field.

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