unixtojd
Name
unixtojd — Converts a UNIX timestamp to a Julian day
count.
Synopsis
int unixtojd([timestamp]);
int timestamp (optional):
UNIX timestamp
Description
unixtojd() converts a UNIX timestamp to a Julian
day count. If no timestamp is given, the function returns
the Julian day count for the current timestamp.
As of PHP 4.0.4, this function behaves oddly if given a
timestamp less than 0. Filtering the input to ensure
that a valid timestamp is being passed to the function
is a good idea.
Available in PHP 4.0.0 RC 2
For more information on the UNIX epoch, visit
http://www.foldoc.org/ and search for epoch.
See also
To convert a Julian day count to a UNIX timestamp date:
jdtounix()
To convert a Julian day count to another calendar system:
See the other jdto*() functions
Example
Example 82. Display the Julian
day count that corresponds to the UNIX epoch
echo 'The Julian day count for the start of the UNIX epoch is ' . unixtojd (1);
Example 83. Ensure that the
timestamp passed to unixtojd() is valid
function filtered_unixtojd ($timestamp = FALSE) {
if ($timestamp < 0 || $timestamp > 2138832000)
return FALSE;
if ($timestamp)
return unixtojd ($timestamp);
return unixtojd ();
}
echo filtered_unixtojd (99232000);
PHP Functions Essential Reference. Copyright © 2002 by New Riders Publishing
(Authors: Zak Greant, Graeme Merrall, Torben Wilson, Brett Michlitsch).
This material may be distributed only subject to the terms and conditions set forth
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http://www.opencontent.org/openpub/).
The authors of this book have elected not to choose any options under the OPL. This online book was obtained
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