how to reduce days of periods in unix time in java

Asked Apr 20 '17 at 10:10

Active Apr 20 '17 at 10:11

Viewed 20 times

I am facing some challenges in validate past week data, So that i want to create a data in any of the date in each last 8 weeks.
I am using below scripts

long currentTimeInMillis = System.currentTimeMillis();  
long last_week = System.currentTimeMillis() - n * 24 * 60 * 60 * 1000;

Its working upto past 3 weeks while changing 'n' value as '7', '14', '21'. I can't go backward after that. Someone pls give suggestions. Thanks in advance.

edited Apr 20 '17 at 10:11

Jens

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asked Apr 20 '17 at 10:10

lotus auto

Use the Calendar for date calculations – Jens Apr 20 '17 at 10:12
@Jens Calendar is a terrible API. Use JSR-310 added into Java 8 and available for Java 6+ – Peter Lawrey Apr 20 '17 at 10:13
@PeterLawrey just call it Date/time api... like localDate – XtremeBaumer Apr 20 '17 at 10:14
@PeterLawrey Maybe but it is the only Thing you have in Standard Java in Versions lower than 8. – Jens Apr 20 '17 at 10:15
do it like that `now = Calendar.getInstance();` `now.add(Calendar.WEEK_OF_YEAR, -n);` `n` is number of weeks to subsctract :) and then `int last_week = now.getTimeInMillis();` – Maraboc Apr 20 '17 at 10:16
@Jens it is still really awful and you can use it in Java 6 if you want. I would rather use `long` (and in fact do) – Peter Lawrey Apr 20 '17 at 10:16
thanks everyone who replied for my concerns. And @PeterLawrey it's working cool. Thanks again – lotus auto Apr 20 '17 at 10:27

how to reduce days of periods in unix time in java

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