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1<?php // phpcs:ignore WordPress.Files.FileName.InvalidClassFileName
2/**
3 * WPCOM_JSON_API_Date class.
4 *
5 * @package automattic/jetpack
6 */
7
8if ( ! defined( 'ABSPATH' ) ) {
9    exit( 0 );
10}
11
12/**
13 * Base class for WPCOM_JSON_API_Date.
14 */
15class WPCOM_JSON_API_Date {
16    /**
17     * Returns ISO 8601 formatted datetime: 2011-12-08T01:15:36-08:00
18     *
19     * @param string $date_gmt GMT datetime string.
20     * @param string $date Optional.  Used to calculate the offset from GMT.
21     *
22     * @return string
23     */
24    public static function format_date( $date_gmt, $date = null ) {
25        $offset        = 0;
26        $timestamp_gmt = strtotime( "$date_gmt+0000" );
27
28        if ( null === $date ) {
29            $timestamp = $timestamp_gmt;
30            $west      = 0;
31            $minutes   = 0;
32            $hours     = 0;
33        } else {
34            $date_time = date_create( "$date+0000" );
35            if ( $date_time ) {
36                $timestamp = date_format( $date_time, 'U' );
37            } else {
38                $timestamp = 0;
39            }
40
41            // "0000-00-00 00:00:00" == -62169984000
42            if ( -62169984000 === $timestamp_gmt ) {
43                // WordPress sets post_date=now, post_date_gmt="0000-00-00 00:00:00" for all drafts
44                // WordPress sets post_modified=now, post_modified_gmt="0000-00-00 00:00:00" for new drafts.
45
46                // Try to guess the correct offset from the blog's options.
47                $timezone_string = get_option( 'timezone_string' );
48
49                if ( $timezone_string && $date_time ) {
50                    $timezone = timezone_open( $timezone_string );
51                    if ( $timezone ) {
52                        $offset = $timezone->getOffset( $date_time );
53                    }
54                } else {
55                    $offset = 3600 * (float) get_option( 'gmt_offset' );
56                }
57            } else {
58                $offset = $timestamp - $timestamp_gmt;
59            }
60
61            $west    = $offset < 0;
62            $offset  = abs( $offset );
63            $hours   = (int) floor( $offset / 3600 );
64            $offset -= $hours * 3600;
65            $minutes = (int) floor( $offset / 60 );
66        }
67
68        return gmdate( 'Y-m-d\\TH:i:s', $timestamp ) . sprintf( '%s%02d:%02d', $west ? '-' : '+', $hours, $minutes );
69    }
70
71    /**
72     * Returns ISO 8601 formatted duration interval: P0DT1H10M0S
73     *
74     * @param string $time Duration in minutes or hours.
75     *
76     * @return null|string
77     */
78    public static function format_duration( $time ) {
79        $timestamp = strtotime( $time, 0 );
80
81        // Bail early if we don't recognize a date.
82        if ( empty( $timestamp ) ) {
83            return;
84        }
85
86        $days      = floor( $timestamp / 86400 );
87        $timestamp = $timestamp % 86400;
88
89        $hours     = floor( $timestamp / 3600 );
90        $timestamp = $timestamp % 3600;
91
92        $minutes   = floor( $timestamp / 60 );
93        $timestamp = $timestamp % 60;
94
95        return sprintf(
96            'P%dDT%dH%dM%dS',
97            $days,
98            $hours,
99            $minutes,
100            $timestamp
101        );
102    }
103}