Can't make resources unavailable in a certain time period

The code is given below. Actually, I have two nodes 0 and 1 where server capacities are 5 and 7 respectively. The servers are unavailable before 9AM (540 mins from midnight) and after 6 PM everyday. I am trying to create the unavailability using timeout but not working. I still do see items are entering nodes 0 and 1 beyond 6 PM on the second day (that is after 2520 minutes). Can't figure out the mistake. Thanks a lot!

import numpy as np
import simpy

def interarrival():
    return(np.random.exponential(20))

def servicetime():
    return(np.random.exponential(60))


def servicing(env, servers_1):
    i = 0
    while(True):
        i = i+1
        yield env.timeout(interarrival())
        print("Customer "+str(i)+ " arrived in the process at "+str(env.now))
        state = 0
        env.process(items(env, i, servers_array, state))

def items(env, customer_id, servers_array, state):
    with servers_array[state].request() as request:
        yield request
        t_arrival = env.now
        print("Customer "+str(customer_id)+ " arrived in "+str(state)+ "  at "+str(t_arrival))
        yield env.timeout(servicetime())
        t_depart = env.now
        print("Customer "+str(customer_id)+ " departed from "+str(state)+ "  at "+str(t_depart))
        if (state == 1):
            print("Customer exits")
        else:
            state = 1
            env.process(items(env, customer_id, servers_array, state))

def delay(env, servers_array):
    while(True):
        #print(servers_array[0].request())
        if (env.now%1440 >= 540 and env.now%1440 < 1080):
            yield env.timeout(1080 - env.now%1440)
        else:
            print(str(env.now), "at resources will be blocked")
            resource_unavailability_dict = dict()
            resource_unavailability_dict[0] = []
            resource_unavailability_dict[1] = []
            for nodes in resource_unavailability_dict:
                for _ in range(servers_array[nodes].capacity):
                    resource_unavailability_dict[nodes].append(servers_array[nodes].request())
            print(resource_unavailability_dict)
            for nodes in resource_unavailability_dict:
                yield env.all_of(resource_unavailability_dict[nodes])
            if (env.now < 540):
                yield env.timeout(540)
            else:
                yield env.timeout((int(env.now/1440)+1)*1440+540 - env.now)
            for nodes in resource_unavailability_dict:
                for request in resource_unavailability_dict[nodes]:
                    servers_array[nodes].release(request)
            print(str(env.now), "resources are released")
            

env = simpy.Environment()
servers_array = []
servers_array.append(simpy.Resource(env, capacity = 5))
servers_array.append(simpy.Resource(env, capacity = 7))
env.process(servicing(env, servers_array))
env.process(delay(env,servers_array))
env.run(until=2880)

Think I found it. you are yielding to a int expressing, I think you need to wrap you int expression with a timeout event

try changing

yield(1080 - env.now%1440)

to

yield env.timeout(1080 - env.now%1440)

in def delay, I do not know what happens if your int expression passes a negative value to timeout. you may need to add a check for that