Convert Unix timestamp to Julian Day

# unixtojd

(PHP 4, PHP 5, PHP 7, PHP 8)

unixtojd — Convert Unix timestamp to Julian Day

### Description

unixtojd(?int `$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).

### Parameters

`timestamp`

  A unix timestamp to convert.

### Return Values

A julian day number as integer, or `false` on failure.

### Changelog

Version | Description
--- | ---
8.0.0 | `timestamp` is nullable now.

### See Also

- jdtounix() - Convert Julian Day to Unix timestamp

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