java - Sqlite group dates by day -

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i'm trying retrieve list of different days table. stored in integer.

cal.gettime().gettime()

returns number of milliseconds since january 1, 1970, 00:00:00 gmt represented date object.

what i've written

select strftime('%d-%m-%y'," + date_clmn + ") "                 + table_name +" group strftime('%d-%m-%y'," + date_clmn + ")"

next, convert these values tostring. get:

24-11--471

and after when try make query 

strftime('%d-%m-%y',date_clmn)=24-11--471

i nothing.

what's wrong?

will run in trouble timezone using way?

if there other ways make it, i'll glad hear you.

thanks in advance.

update

tried "date(" + date_clmn+ ",'unixepoch')" retrieved value "1970-01-01"

since not storing date in table, need change field. try code:

"select strftime('%d-%m-%y'," + date_clmn + "/1000,'unixepoch') " + table_name +" group strftime('%d-%m-%y'," + date_clmn + "/1000,'unixepoch')"

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