Converts from a supported calendar to Julian Day Count

# cal_to_jd

(PHP 4 >= 4.1.0, PHP 5, PHP 7, PHP 8)

cal_to_jd — Converts from a supported calendar to Julian Day Count

### Description

cal_to_jd(
int `$calendar`,
int `$month`,
int `$day`,
int `$year`
): int

cal_to_jd() calculates the Julian day count for a date in the specified `calendar`. Supported `calendar`s are `CAL_GREGORIAN`, `CAL_JULIAN`, `CAL_JEWISH` and `CAL_FRENCH`.

### Parameters

`calendar`

  Calendar to convert from, one of `CAL_GREGORIAN`, `CAL_JULIAN`, `CAL_JEWISH` or `CAL_FRENCH`.

`month`

  The month as a number, the valid range depends on the `calendar`

`day`

  The day as a number, the valid range depends on the `calendar`

`year`

  The year as a number, the valid range depends on the `calendar`

### Return Values

A Julian Day number.

### See Also

- cal_from_jd() - Converts from Julian Day Count to a supported calendar
- frenchtojd() - Converts a date from the French Republican Calendar to a Julian Day Count
- gregoriantojd() - Converts a Gregorian date to Julian Day Count
- jewishtojd() - Converts a date in the Jewish Calendar to Julian Day Count
- juliantojd() - Converts a Julian Calendar date to Julian Day Count
- unixtojd() - Convert Unix timestamp to Julian Day

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