Solved

PROBLEMS WITH DATES

Posted on 1998-10-22
1
173 Views
Last Modified: 2010-04-15
Could anybody tell me how to get the date in format 'yyyymmdd' from a week ago to the actual date?

By instance, today´s date
Example: 19981022

I´interested to know the date a week ago.
19981015

The problem comes with the first days of the month, year...

Thanks very much
0
Comment
Question by:carlos0007
1 Comment
 
LVL 8

Accepted Solution

by:
Answers2000 earned 100 total points
ID: 1253732
(1) Convert the date (X) you're working with, into time since some reference point.
     Using standard time.h header, you can do this by filling in struct tm and calling mk_time (which will return a value of type time_t which is seconds since 1970).  Keep this
     value

(2) Subtract 60*60*24*7 (one week's seconds) from the time_t you just got

(3) Call gmtime with the result of (2) to get another struct tm, call this pLastWeek

(4) Output, example:

printf( "%04d%02d%02d", pLastWeek->tm_year, (pLastWeek->tm_mon)+1, pLastWeek->tm_mday ) ;

This will work provide last week was after 1 Jan 1970


0

Featured Post

3 Use Cases for Connected Systems

Our Dev teams are like yours. They’re continually cranking out code for new features/bugs fixes, testing, deploying, testing some more, responding to production monitoring events and more. It’s complex. So, we thought you’d like to see what’s working for us.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

An Outlet in Cocoa is a persistent reference to a GUI control; it connects a property (a variable) to a control.  For example, it is common to create an Outlet for the text field GUI control and change the text that appears in this field via that Ou…
This tutorial is posted by Aaron Wojnowski, administrator at SDKExpert.net.  To view more iPhone tutorials, visit www.sdkexpert.net. This is a very simple tutorial on finding the user's current location easily. In this tutorial, you will learn ho…
The goal of this video is to provide viewers with basic examples to understand and use pointers in the C programming language.
Video by: Grant
The goal of this video is to provide viewers with basic examples to understand and use while-loops in the C programming language.

810 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question