A method for establishing a correspondence by intervals ([T B], [T AB]) between the time (T B) indicated by a first monotonic clock (H B) and the time (T A) indicated by a second clock (H A), also monotonic, characterized in that it operates, over at least one temporal range (P1, P4), a first temporal reference common to the first and to the second clock and monotonic over said range, and in that said method comprises the steps of: a) determining a first temporal interval ([T B 1]) bounded by a first pair of time values (T B) of the first clock (H B) and belonging to a first temporal range over which the first temporal reference common to the first and to the second clock exists; b) determining a second temporal interval ([T B 2]) bounded by a second pair of time values (T B) of the first clock (H B) and belonging to a second temporal range over which the first temporal reference common to the first and to the second clock exists; c) determining, by means of the common temporal reference, a third temporal interval ([T AB 1]), bounded by a first pair of time values (T A) of the second clock (H A), and containing the first temporal interval ([T B 1]); d) determining, by means of the common temporal reference, a fourth temporal interval ([T AB 2]), bounded by a second pair of time values (T A) of the second clock (H A), and containing the second temporal interval ([T B 2]); e) for any given fifth temporal interval ([T B]) bounded by a third pair of time values (T B) of the first clock (H B), calculating a sixth temporal interval ([T AB]), bounded by a third pair of time values (T A) of the second clock (H A), and containing said fifth temporal interval ([T B]), the calculation being performed by interpolation or extrapolation using said first ([T B 1]), second ([T B 2]), third ([T AB 1]) and fourth ([T AB 2]) intervals. a) determining a first temporal interval ([T B 1]) bounded by a first pair of time values (T B) of the first clock (H B) and belonging to a first temporal range over which the first temporal reference common to the first and to the second clock exists; b) determining a second temporal interval ([T B 2]) bounded by a second pair of time values (T B) of the first clock (H B) and belonging to a second temporal range over which the first temporal reference common to the first and to the second clock exists; c) determining, by means of the common temporal reference, a third temporal interval ([T AB 1]), bounded by a first pair of time values (T A) of the second clock (H A), and containing the first temporal interval ([T B 1]); d) determining, by means of the common temporal reference, a fourth temporal interval ([T AB 2]), bounded by a second pair of time values (T A) of the second clock (H A), and containing the second temporal interval ([T B 2]); e) for any given fifth temporal interval ([T B]) bounded by a third pair of time values (T B) of the first clock (H B), calculating a sixth temporal interval ([T AB]), bounded by a third pair of time values (T A) of the second clock (H A), and containing said fifth temporal interval ([T B]), the calculation being performed by interpolation or extrapolation using said first ([T B 1]), second ([T B 2]), third ([T AB 1]) and fourth ([T AB 2]) intervals.