function bbp_get_time_since( $older_date, $newer_date = false, $gmt = false ) {

		// Setup the strings
		$unknown_text   = apply_filters( 'bbp_core_time_since_unknown_text',   esc_html__( 'sometime',  'bbpress' ) );
		$right_now_text = apply_filters( 'bbp_core_time_since_right_now_text', esc_html__( 'right now', 'bbpress' ) );
		$ago_text       = apply_filters( 'bbp_core_time_since_ago_text',       esc_html__( '%s ago',    'bbpress' ) );

		// array of time period chunks
		$chunks = array(
			array( YEAR_IN_SECONDS,   _n_noop( '%s year',   '%s years',   'bbpress' ) ),
			array( MONTH_IN_SECONDS,  _n_noop( '%s month',  '%s months',  'bbpress' ) ),
			array( WEEK_IN_SECONDS,   _n_noop( '%s week',   '%s weeks',   'bbpress' ) ),
			array( DAY_IN_SECONDS,    _n_noop( '%s day',    '%s days',    'bbpress' ) ),
			array( HOUR_IN_SECONDS,   _n_noop( '%s hour',   '%s hours',   'bbpress' ) ),
			array( MINUTE_IN_SECONDS, _n_noop( '%s minute', '%s minutes', 'bbpress' ) ),
			array( 1,                 _n_noop( '%s second', '%s seconds', 'bbpress' ) ),
		);

		// Attempt to parse non-numeric older date
		if ( ! empty( $older_date ) && ! is_numeric( $older_date ) ) {
			$time_chunks = explode( ':', str_replace( ' ', ':', $older_date ) );
			$date_chunks = explode( '-', str_replace( ' ', '-', $older_date ) );
			$older_date  = gmmktime( (int) $time_chunks[1], (int) $time_chunks[2], (int) $time_chunks[3], (int) $date_chunks[1], (int) $date_chunks[2], (int) $date_chunks[0] );
		}

		// Attempt to parse non-numeric newer date
		if ( ! empty( $newer_date ) && ! is_numeric( $newer_date ) ) {
			$time_chunks = explode( ':', str_replace( ' ', ':', $newer_date ) );
			$date_chunks = explode( '-', str_replace( ' ', '-', $newer_date ) );
			$newer_date  = gmmktime( (int) $time_chunks[1], (int) $time_chunks[2], (int) $time_chunks[3], (int) $date_chunks[1], (int) $date_chunks[2], (int) $date_chunks[0] );
		}

		// Set newer date to current time
		if ( empty( $newer_date ) ) {
			$newer_date = strtotime( current_time( 'mysql', $gmt ) );
		}

		// Cast both dates to ints to avoid notices & errors with invalid values
		$newer_date = intval( $newer_date );
		$older_date = intval( $older_date );

		// Difference in seconds
		$since = intval( $newer_date - $older_date );

		// Something went wrong with date calculation and we ended up with a negative date.
		if ( 0 > $since ) {
			$output = $unknown_text;

		// We only want to output two chunks of time here, eg:
		//     x years, xx months
		//     x days, xx hours
		// so there's only two bits of calculation below:
		} else {

			// Step one: the first chunk
			for ( $i = 0, $j = count( $chunks ); $i < $j; ++$i ) {
				$seconds = $chunks[ $i ][0];

				// Finding the biggest chunk (if the chunk fits, break)
				$count = floor( $since / $seconds );
				if ( 0 != $count ) {
					break;
				}
			}

			// If $i iterates all the way to $j, then the event happened 0 seconds ago
			if ( ! isset( $chunks[ $i ] ) ) {
				$output = $right_now_text;

			} else {

				// Set output var
				$output = sprintf( translate_nooped_plural( $chunks[ $i ][1], $count, 'bbpress' ), bbp_number_format_i18n( $count ) );

				// Step two: the second chunk
				if ( $i + 2 < $j ) {
					$seconds2 = $chunks[ $i + 1 ][0];
					$count2   = floor( ( $since - ( $seconds * $count ) ) / $seconds2 );

					// Add to output var
					if ( 0 != $count2 ) {
						$output .= _x( ',', 'Separator in time since', 'bbpress' ) . ' ';
						$output .= sprintf( translate_nooped_plural( $chunks[ $i + 1 ][1], $count2, 'bbpress' ), bbp_number_format_i18n( $count2 ) );
					}
				}

				// No output, so happened right now
				if ( ! (int) trim( $output ) ) {
					$output = $right_now_text;
				}
			}
		}

		// Append 'ago' to the end of time-since if not 'right now'
		if ( $output != $right_now_text ) {
			$output = sprintf( $ago_text, $output );
		}

		// Filter & return
		return apply_filters( 'bbp_get_time_since', $output, $older_date, $newer_date );
	}