Snippet to hide WooCommerce shipping methods based on days, based on cutoff time. PluginHive Plugins - https://www.pluginhive.com/product/multiple-carrier-shipping-plugin-woocommerce/, https://www.pluginhive.com/product/woocommerce-ups-shipping-plugin-with-print-label/, https://www.pluginhive.com/product/woocommerce-fedex-shipping-plugin-with-pr…

functions.php

/**
 * Snippet to hide woocommerce shipping methods based on days, based on cutoff time. Drawback - If Calculated before Cutoff time and placed order after cutoff then it won't work.
 * Created at : 16 July 2018
 * Updated at : 02 Aug 2018
 * PluginHive Plugins : https://www.pluginhive.com/plugins/
 * Gist Link : https://gist.github.com/xadapter/d8caee4845bb41c0d3da1a9b2a3ba897
 */ 
add_filter( 'woocommerce_package_rates', function( $shipping_rates) {

	// To hide shipping methods based on days
	$shipping_method_to_hide_after_time = array(
		'17:00'	=>	array(
			"wf_fedex_woocommerce_shipping:FEDEX_GROUND_TEST", "flat_rate:1test"		// Time in 24 hour format and array of shipping methods array
		),
		'15:30'	=>	array(
			"wf_fedex_woocommerce_shipping:FEDEX_GROUND_EST", "flat_rate:test", "flat_rate:1", "free_shipping:2"
		),
	);
	$message_to_display_based_on_time = "[SERVICES] Services are Not Available on Weekends or After [TIME] Weekdays.";	// Leave empty to not display any message, Tags available - [SERVICES], [TIME]

	//To hide shipping methods based on day
	$hide_shipping_methods_based_on_day  = array(
		'Wed'	=>	array(
			'flat_rate:1',
		),
		'Thu'	=>	array(),
	);
	$message_to_display_for_days = "[SERVICES] not available on [DAYS]."; //Leave empty to not display any messag, Tage available - [SERVICES], [DAYS]


	$wp_timezone_string = get_option('timezone_string');
	$wf_date = new DateTime;
		if( empty($wp_timezone_string) ) {
			$time_offset 		= get_option('gmt_offset');
			$wp_timezone_string = timezone_name_from_abbr( "", $time_offset*60*60, 0 );
		}
	$date_obj = new DateTime( "now", new DateTimeZone( $wp_timezone_string ));		// Current time and date
	

	// Handle based on days
	$today_name = $date_obj->format('D');				// Day as first three letter like Sun
	$today_name_full = $date_obj->format('l');			// Complete day name like Sunday
	if( isset( $hide_shipping_methods_based_on_day[$today_name]) ) {
		foreach( $shipping_rates as $key => $shipping_rate ) {
			$shipping_method_id = $shipping_rate->get_id();
			if( in_array($shipping_method_id, $hide_shipping_methods_based_on_day[$today_name]) ) {
				$services_hidden = ! empty($services_hidden) ? $services_hidden.', '.$shipping_rate->get_label() : $shipping_rate->get_label();
				unset($shipping_rates[$key]);
			}
		}
		if( ! empty($services_hidden) && ! empty($message_to_display_for_days) ) {
			$message = str_replace( "[SERVICES]", $services_hidden, $message_to_display_for_days );
			$message = str_replace( "[DAYS]", $today_name_full, $message );
			if( is_cart() || is_checkout() ) {
				wc_add_notice(print_r($message,true), "error" );
			}
		}
	}

	// Handle based on current time
	$current_time = $date_obj->format('H:i');
	foreach( $shipping_method_to_hide_after_time as $time => $shipping_methods_to_hide ){
		$services = null;
		if( $current_time > $time ) {
			foreach( $shipping_rates as $key => $shipping_rate ) {
				$shipping_method_id = $shipping_rate->get_id();
				if( in_array($shipping_method_id, $shipping_methods_to_hide) ) {
					$services = ! empty($services) ? $services.', '.$shipping_rate->get_label() : $shipping_rate->get_label();
					unset($shipping_rates[$key]);
				}
			}
		}
		if( ! empty($services) && ! empty($message_to_display_based_on_time) ) {
			$message = str_replace( "[SERVICES]", $services, $message_to_display_based_on_time );
			$exploded_time = explode( ':', $time );
			$time_as_12_hr_format = ( (int)$exploded_time[0] > 12 ) ? ( (string) ( (int)$exploded_time[0] - 12) ).':'.$exploded_time[1]. ' pm' : $time.' am';
			$message = str_replace( "[TIME]", $time_as_12_hr_format, $message );
			if( is_cart() || is_checkout() ) {
				wc_add_notice(print_r($message,true), "error" );
			}
		}
	}

	return $shipping_rates;
});