(PHP 4, PHP 5, PHP 7, PHP 8)
unixtojd — Convert Unix timestamp to Julian Day
$timestamp = null): int|false
   Return the Julian Day for a Unix timestamp
   (seconds since 1.1.1970), or for the current day if no
   timestamp is given. Either way, the time is regarded
   as local time (not UTC).
  
timestampA unix timestamp to convert.
   A julian day number as integer,  or false on failure.
  
| Version | Description | 
|---|---|
| 8.0.0 | timestampis nullable now. |