A method for broadcasting time and for measuring the integrity of the broadcast time for a receiver communicating over radiofrequencies with at least four synchronised terrestrial time transfer beacons (102, 103, 104) each broadcasting a time message comprising a time marker and a transmission time, the method for broadcasting time and for measuring the integrity of the broadcast time being characterised in that it comprises: - a first step of computing a time of arrival of the time messages transmitted by said terrestrial time transfer beacons, with the positions of said terrestrial time transfer beacons being known by the receiver or being transmitted to the receiver, and of determining a pseudo-distance measurement associated with each time transfer terrestrial beacon; - a second step of implementing a resolution algorithm optimising a maximum likelihood criterion using the pseudo-distances computed in the first step and jointly resolving the positions of the terrestrial time transfer beacons, the position of the receiver and the time shift of the receiver; - a third step of computing a test variable T equal to the sum of the square of the remainders of the positions of the receiver and of the terrestrial time transfer beacons, weighted by variances in the positions of the receiver and of the terrestrial time transfer beacons; - a fourth step of determining an alert threshold on the test variable T according to a given false alarm probability Pfa, and, when the test variable T is greater than or equal to said alert threshold, issuing a loss of integrity warning; and otherwise - a fifth step of determining a non-centrality parameter λ of the test variable T for said false alarm probability Pfa and for a given detection probability Pd; - a sixth step of determining a minimum detectable clock bias for each time transfer terrestrial beacon based on the test variable T and the non-centrality parameter λ; - a seventh step of determining a minimum detectable position bias for each time transfer terrestrial beacon based on the test variable T and the non-centrality parameter λ; - an eighth step of determining a protection area for the time shift information of the receiver computed during the second step based on the detectable minimum biases computed during the sixth step and the seventh step of the method, and of issuing a loss of integrity warning when said protection area is greater than or equal to a warning area. - a first step of computing a time of arrival of the time messages transmitted by said terrestrial time transfer beacons, with the positions of said terrestrial time transfer beacons being known by the receiver or being transmitted to the receiver, and of determining a pseudo-distance measurement associated with each time transfer terrestrial beacon; - a second step of implementing a resolution algorithm optimising a maximum likelihood criterion using the pseudo-distances computed in the first step and jointly resolving the positions of the terrestrial time transfer beacons, the position of the receiver and the time shift of the receiver; - a third step of computing a test variable T equal to the sum of the square of the remainders of the positions of the receiver and of the terrestrial time transfer beacons, weighted by variances in the positions of the receiver and of the terrestrial time transfer beacons; - a fourth step of determining an alert threshold on the test variable T according to a given false alarm probability Pfa, and, when the test variable T is greater than or equal to said alert threshold, issuing a loss of integrity warning; and otherwise - a fifth step of determining a non-centrality parameter λ of the test variable T for said false alarm probability Pfa and for a given detection probability Pd; - a sixth step of determining a minimum detectable clock bias for each time transfer terrestrial beacon based on the test variable T and the non-centrality parameter λ; - a seventh step of determining a minimum detectable position bias for each time transfer terrestrial beacon based on the test variable T and the non-centrality parameter λ; - an eighth step of determining a protection area for the time shift information of the receiver computed during the second step based on the detectable minimum biases computed during the sixth step and the seventh step of the method, and of issuing a loss of integrity warning when said protection area is greater than or equal to a warning area.