CODEWITHSUNDEEP
phptimestampprogress-bar
Simon Thomsen
Simon Thomsen

Reputation: 1411

how to find percent between two timestamps

Hello people :) How can i get the percent between to unix timestamps (I need to use it to my progress bar)

If i have for example 1303248948 and 1303252200. How can i the found out what the percent is out of 100% percent.

So my progress bar constantly can change the width when the first timestamp comes closer to the second timestamp.

So it will be: width="1%" and width="2%" and so on, until it reach 100% in width.

Hope someone can help me! ;-)

Upvotes: 2

Views: 3537

Answers (2)

Christian
Christian

Reputation: 28125

Actually, you need 3 time stamps:

starting stamp, current stamp (progress), finish stamp

I'm assuming the current stamp is the current time(). In which case;

$begin= strtotime('-2 weeks');
$now = time();
$end = strtotime('+2 weeks');

$percent = ($now-$begin) / ($end-$begin) * 100;

Note: In the above example, $percent should be 50%.

Upvotes: 17

Kevin Loney
Kevin Loney

Reputation: 7553

This is actually a pretty simple range mapping problem. Given the value t in the range [a, b] you need to map it to an equivalent value in the range [c, d].

First you'll want to map t into the range [0, 1]

x = (t - a) / (b - a)

Second you'll want to map that value x to the range [c, d]

t' = x * (d - c) + c

This is actually a pretty handy general equation that I use frequently for all kinds of problems and remembering how to construct it is really handy.

Upvotes: 1

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