# MongoDB\BSON\UTCDateTime::__construct

(mongodb >=1.0.0)

MongoDB\BSON\UTCDateTime::__construct — Construct a new UTCDateTime

### 说明

final public MongoDB\BSON\UTCDateTime::__construct(int|MongoDB\BSON\Int64|DateTimeInterface|null `$milliseconds` = `null`)

### 参数

`milliseconds` (int|MongoDB\BSON\Int64|DateTimeInterface|null)

  Number of milliseconds since the Unix epoch (Jan 1, 1970). Negative values represent dates before 1970. This value may be provided as a 64-bit int. For compatibility on 32-bit systems, this parameter may also be provided as a MongoDB\BSON\Int64.

  If the argument is a DateTimeInterface, the number of milliseconds since the Unix epoch will be derived from that value.

  If this argument is `null`, the current time will be used by default.

### 错误／异常

- Throws MongoDB\Driver\Exception\InvalidArgumentException on argument parsing errors.

### 更新日志

版本 | 说明
--- | ---
PECL mongodb 2.0.0 | The `milliseconds` no longer accepts a string or float argument.
PECL mongodb 1.20.0 | The `milliseconds` argument now accepts a MongoDB\BSON\Int64 object (for compatibility on 32-bit platforms). Specifying a string or float is deprecated.
PECL mongodb 1.2.0 | The `milliseconds` argument is optional and defaults to `null` (i.e. current time). The argument also accepts a DateTimeInterface, which may be used to derive the number of milliseconds since the Unix epoch. Previously, only int, float, and string types were accepted.

### 示例

示例 #1 MongoDB\BSON\UTCDateTime::__construct() example

`<?php
var_dump(new MongoDB\BSON\UTCDateTime);
var_dump(new MongoDB\BSON\UTCDateTime(new DateTime));
var_dump(new MongoDB\BSON\UTCDateTime(1416445411987));
?>`

以上示例的输出类似于：

    object(MongoDB\BSON\UTCDateTime)#1 (1) {
      ["milliseconds"]=>
      string(13) "1484852905560"
    }
    object(MongoDB\BSON\UTCDateTime)#1 (1) {
      ["milliseconds"]=>
      string(13) "1484852905560"
    }
    object(MongoDB\BSON\UTCDateTime)#1 (1) {
      ["milliseconds"]=>
      string(13) "1416445411987"
    }

### 参见

- » BSON Types: Date

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