PHP 7.1.0 Release Candidate 3 Released


(PHP 4, PHP 5)

jdtounixConverte un Giorno Giuliano in un timestamp Unix


int jdtounix ( int $giornogiuliano )

Questa funzione restituisce un timestamp Unix corrispondente al Giorno Giuliano giornogiuliano o FALSE se giornogiuliano non è all'interno della gamma Unix (anni Gregoriani tra il 1970 e il 2037 o 2440588 <= giornogiuliano <= 2465342 ). L'ora restituita è locale (e non GMT).

See also unixtojd().

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User Contributed Notes 5 notes

seb at carbonauts dot com
12 years ago
Remember that unixtojd() assumes your timestamp is in GMT, but jdtounix() returns a timestamp in localtime.

This fooled me a few times. 

So if you have:

$timestamp1 = time();
$timestamp2 = jdtounix(unixtojd($timestamp1));

Unless your localtime is the same as GMT, $timestamp1 will not equal $timestamp2.
fabio at llgp dot org
10 years ago
If you need an easy way to convert a decimal julian day to an unix timestamp you can use:

$unixTimeStamp = ($julianDay - 2440587.5) * 86400;

2440587.5 is the julian day at 1/1/1970 0:00 UTC
86400 is the number of seconds in a day
11 years ago
Warning: the calender functions involving julian day operations seem to ignore the decimal part of the julian day count.

This means that the returned date is wrong 50% of the time, since a julian day starts at decimal .5 .  Take care!!
Saeed Hubaishan
1 year ago
unixtojd() assumes that your timestamp is in GMT, but jdtounix() returns a timestamp in localtime.
$d2= gmdate("m/d/Y");
$d1 always equals $d2 but $d1 may differ from $d3
pipian at pipian dot com
13 years ago
Remember that UNIX timestamps indicate a number of seconds from midnight of January 1, 1970 on the Gregorian calendar, not the Julian Calendar.
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