1 files changed, 88 insertions, 0 deletions
diff --git a/plugins/jetpack/sal/class.json-api-date.php b/plugins/jetpack/sal/class.json-api-date.php
new file mode 100644
index 00000000..c5c0cb38
--- /dev/null
+++ b/plugins/jetpack/sal/class.json-api-date.php
@@ -0,0 +1,88 @@
+<?php
+
+class WPCOM_JSON_API_Date {
+	/**
+	 * Returns ISO 8601 formatted datetime: 2011-12-08T01:15:36-08:00
+	 *
+	 * @param $date_gmt (string) GMT datetime string.
+	 * @param $date (string) Optional.  Used to calculate the offset from GMT.
+	 *
+	 * @return string
+	 */
+	static function format_date( $date_gmt, $date = null ) {
+		$timestamp_gmt = strtotime( "$date_gmt+0000" );
+
+		if ( null === $date ) {
+			$timestamp = $timestamp_gmt;
+			$hours     = $minutes = $west = 0;
+		} else {
+			$date_time = date_create( "$date+0000" );
+			if ( $date_time ) {
+				$timestamp = date_format( $date_time, 'U' );
+			} else {
+				$timestamp = 0;
+			}
+
+			// "0000-00-00 00:00:00" == -62169984000
+			if ( - 62169984000 == $timestamp_gmt ) {
+				// WordPress sets post_date=now, post_date_gmt="0000-00-00 00:00:00" for all drafts
+				// WordPress sets post_modified=now, post_modified_gmt="0000-00-00 00:00:00" for new drafts
+
+				// Try to guess the correct offset from the blog's options.
+				$timezone_string = get_option( 'timezone_string' );
+
+				if ( $timezone_string && $date_time ) {
+					$timezone = timezone_open( $timezone_string );
+					if ( $timezone ) {
+						$offset = $timezone->getOffset( $date_time );
+					}
+				} else {
+					$offset = 3600 * get_option( 'gmt_offset' );
+				}
+			} else {
+				$offset = $timestamp - $timestamp_gmt;
+			}
+
+			$west   = $offset < 0;
+			$offset = abs( $offset );
+			$hours  = (int) floor( $offset / 3600 );
+			$offset -= $hours * 3600;
+			$minutes = (int) floor( $offset / 60 );
+		}
+
+		return (string) gmdate( 'Y-m-d\\TH:i:s', $timestamp ) . sprintf( '%s%02d:%02d', $west ? '-' : '+', $hours, $minutes );
+	}
+
+	/**
+	 * Returns ISO 8601 formatted duration interval: P0DT1H10M0S
+	 *
+	 * @param string $time Duration in minutes or hours.
+	 *
+	 * @return null|string
+	 */
+	static function format_duration( $time ) {
+		$timestamp = strtotime( $time, 0 );
+
+		// Bail early if we don't recognize a date.
+		if ( empty( $timestamp ) ) {
+			return;
+		}
+
+		$days = floor( $timestamp / 86400 );
+		$timestamp = $timestamp % 86400;
+
+		$hours = floor( $timestamp / 3600 );
+		$timestamp = $timestamp % 3600;
+
+		$minutes = floor( $timestamp / 60 );
+		$timestamp = $timestamp % 60;
+
+		return (string) sprintf(
+			'P%dDT%dH%dM%dS',
+			$days,
+			$hours,
+			$minutes,
+			$timestamp
+		);
+	}
+}