A method for supporting multiple time zones in an IP Multimedia Subsystem, IMS, comprising: sending, by a Proxy Call Session Control Function, PCSCF network element, a first Session Initiation Protocol, SIP message including time zone information to a control layer network element exclusive of the PCSCF network element; after obtaining the time zone information, sending, by the control layer network element receiving the first SIP message, a second SIP message including the time zone information to a service layer network element; and receiving, by the service layer network element, the second SIP message sent from the control layer network element, and obtaining the time zone information included in the second SIP message, wherein the sending, by a PCSCF network element, the first SIP message including time zone information to a control layer network element exclusive of the PCSCF network element comprises: in the condition that the PCSCF network element does not trust information reported from a User Equipment, UE, when an access layer network element provides time zone information, sending, by the PCSCF network element, the first SIP message including the time zone information provided by the access layer network element to the control layer network element exclusive of the PCSCF network element, when the access layer network element does not provide time zone information, determining, by the PCSCF network element, time zone information of the UE, and sending the first SIP message including the determined time zone information to the control layer network element exclusive of the PCSCF network element. sending, by a Proxy Call Session Control Function, PCSCF network element, a first Session Initiation Protocol, SIP message including time zone information to a control layer network element exclusive of the PCSCF network element; after obtaining the time zone information, sending, by the control layer network element receiving the first SIP message, a second SIP message including the time zone information to a service layer network element; and receiving, by the service layer network element, the second SIP message sent from the control layer network element, and obtaining the time zone information included in the second SIP message, wherein the sending, by a PCSCF network element, the first SIP message including time zone information to a control layer network element exclusive of the PCSCF network element comprises: in the condition that the PCSCF network element does not trust information reported from a User Equipment, UE, when an access layer network element provides time zone information, sending, by the PCSCF network element, the first SIP message including the time zone information provided by the access layer network element to the control layer network element exclusive of the PCSCF network element, when the access layer network element does not provide time zone information, determining, by the PCSCF network element, time zone information of the UE, and sending the first SIP message including the determined time zone information to the control layer network element exclusive of the PCSCF network element. in the condition that the PCSCF network element does not trust information reported from a User Equipment, UE, when an access layer network element provides time zone information, sending, by the PCSCF network element, the first SIP message including the time zone information provided by the access layer network element to the control layer network element exclusive of the PCSCF network element, when the access layer network element does not provide time zone information, determining, by the PCSCF network element, time zone information of the UE, and sending the first SIP message including the determined time zone information to the control layer network element exclusive of the PCSCF network element.