The disclosure provides a method for supporting multiple time zones in an IP Multimedia Subsystem (IMS). The method comprises: a Proxy Call Session Control Function (PCSCF) network element sends a Session Initiation Protocol (SIP) message including time zone information to a control layer network element exclusive of the PCSCF network element (201); after obtaining the time zone information, the control layer network element receiving the SIP message sends an SIP message including the time zone information to a service layer network element (202); and the service layer network element receives the SIP message sent from the control layer network element and obtains the time zone information included in the SIP message (203). The disclosure also provides a system for supporting multiple time zones, a charging method and a charging system in an IMS. Through the solution of the disclosure, the time zone information can be transferred to each network element above in the IMS, and local time of a user in a call can be included in a Charging Data Record (CDR), thus, the accuracy of charging is improved.