Unfortunately, you are very vague about the details. Which airline did you book the itinerary on? Which airline is flying which leg of the trip? Did you purchase the ticket directly from the airline, a travel website, or an agency?
Airlines are allowed to change flight schedules without notice. This is part of the contract of carriage which you agree to when purchasing a ticket. However, airlines generally do inform customers to such changes when an e-mail address and/or phone number is provided by the customer. When a customer purchases tickets not directly from the airline, but from a website (for example), it is the responsibility of the agency selling the ticket to notify the customer.
Until you provide details, no one can answer your question.
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