Prettify a range of times.

get_pretty_time_range.php

<?php
/**
 *  Prettify a range of times.
 *
 *  @param   mixed   $start         The start date, with time
 *  @param   mixed   $end           The end date, with time
 *  @return  string                 A prettified date() string for the time range
 */
function get_pretty_time_range( $start='', $end='' ) {
    $diff_meridiem = false;
    $remove_minutes = false;

    // Make sure a start and end date are supplied
    if( empty( $start ) || empty( $end ) ) {
        return 'You need to supply a start and end time.';
    }

    if( ! is_valid_timestamp( $start ) ) {
        $start = strtotime( $start );
    }

    if( ! is_valid_timestamp( $end ) ) {
        $end = strtotime( $end );
    }

    // Check if minutes need to exist
    if( date( 'i', $start ) == 0 && date( 'i', $end ) == 0 ) {
        $remove_minutes = true;
    }

    // Check if the times match
    if ( date( 'H:i:s', $start ) == date( 'H:i:s', $end ) ) {
        if( $remove_minutes ) {
            return date( 'g A', $start );
        } else {
            return date( 'g:i A', $start );
        }
    } else {
        // Check if meridiems differ
        if( date( 'A', $start ) != date( 'A', $end ) ) {
            $diff_meridiem = true;
        }
    }

    // Different meridiems
    if( $diff_meridiem ) {
        if( $remove_minutes ) {
            return date( 'g A', $start ).' - '.date( 'g A', $end );
        } else {
            return date( 'g:i A', $start ).' - '.date( 'g:i A', $end );
        }
    }

    // Format for having different hours or minutes
    if( $remove_minutes ) {
        return date( 'g', $start ).' - '.date( 'g A', $end );
    } else {
        return date( 'g:i', $start ).' - '.date( 'g:i A', $end );
    }
}

function is_valid_timestamp( $strTimestamp ) {
    return ( (string)(int)$strTimestamp == $strTimestamp )
        && ( $strTimestamp <= PHP_INT_MAX )
        && ( $strTimestamp >= ~PHP_INT_MAX );
}