java - How to find date values which are more than 10 days old -


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i using java , iterating on d.b. column in return gives me date , time string shown below:

string datetime = resultset.getseries().get(0).getvalues().get(0).get(0);

if iterate on resultset getting datetime values in format shown below. 

2017-07-20t19:21:37.987792408z 2017-04-24t22:04:26.808753375z 2017-08-14t22:22:40.340772396z 2017-06-24t22:24:32.422544491z 2017-07-31t22:27:05.893368615z

out of these records, how can compare date string "current" date object , discard values more 10 days old?

i tried

date date = new simpledateformat("yyyy-mm-dd't'hh:mm:ssz").parse(s);

that didn't work. other idea?

edit: using java7 , using influxdb not provide sysdate column while querying. have come solution using java.

java.time

retrieve date-time values date-time objects, not strings.

the instant class represents moment on timeline in utc resolution of nanoseconds. 

instant instant = myresultset.getobject( … , instant.class ) ;

compare ten days before current moment.

instant = instant.now() ; instant tendaysago = now.minus( 10 , chronounit.days ) ; boolean prior = instant.isbefore( tendaysago ) ;

you may not want base "ten days ago" on utc. if not, apply time zone zoneddatetime , localdate. has been covered many times search stack overflow. think if "days" means (a) chunks of 24-hours or (b) calendar dates you.

fyi, strings happen in standard iso 8601 format. t separates date portion time portion. z short zulu , means utc. instant class uses same format in tostring method.

sql

generally, should such comparison work in database part of sql query rather in java app. database highly tuned work; app not. 

string sql = "select * tbl_ when_ < ? " ; … make preparedstatement mypreparedstatement.setobject( 1 , tendaysago ) ; … execute

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