“(1) This section applies where this Act provides for it to apply for the purposes of a provision of this Act (a “relevant provision”). … (2) In this section - (a) Day A is the day on which the complainant or applicant concerned complies with the requirement in subsection (1) ofsection 18A of the Employment Tribunals Act 1996 (requirement to contact ACAS before instituting proceedings) in relation to the matter in respect of which the proceedings are brought, and (b) Day B is the day on which the complainant or applicant concerned receives … the certificate issued under subsection (4) of that section. (3) In working out when a time limit set by a relevant provision expires, the period beginning with the day after Day A and ending with Day B is not to be counted. (4) If a time limit set by a relevant provision would (if not extended by this subsection) expire during the period beginning with Day A and ending one month after Day B, the time limit expires instead at the end of that period. (5) Where an employment tribunal has power under this Act to extend a time limit set by a relevant provision, the power is exercisable in relation to the time limit as extended by this section.”
“… reference to a “month” in a statute is to be understood as a calendar month. … It is … well established, and is not disputed by counsel for the tenant, that when the relevant period is a month or specified number of months after the giving of a notice, the general rule is that the period ends upon the corresponding date in the appropriate subsequent month, i.e. the day of that month that bears the same number as the day of the earlier month on which the notice was given. The corresponding date rule is simple. It is easy of application. Except in a small minority of cases, of which the instant case is not an example, all that the calculator has to do is mark in his diary the corresponding date in the appropriate subsequent month. Because the number of days in five months of the year is less than in the seven others the inevitable consequence of the corresponding date rule is that one month’s notice given in a 30 day month is one day shorter than one month’s notice given in a 31 day month and is three days shorter if it is given in February. Corresponding variations in the length of notice reckoned in days occur where the required notice is a plurality of months. This simple general rule … described as being “in accordance with common usage … and with the sense of mankind,” works perfectly well without need for any modification so long as there is in the month in which the notice expires a day which bears the same number as the day of the month on which the notice was given. Such was the instant case and such will be every other case except for notices given on the 31st of a 31 day month and expiring in a 30 day month or in February, and notices expiring in February and given on the 30th or the 29th (except in a leap year) of any other month of the year. In those exceptional cases, the modification of the corresponding date rule that is called for is also well established: the period given by the notice ends upon the last day of the month in which the notice expires.”
“… I am with respect unable to accept this departure from the corresponding date principle … a departure from the sound and well established rules is not required in that one instance …”
“16. … it was clear I had made an error by counting the time from the second ACAS certificate issued on02 July 2015 .”
“42. … the legislation is designed to allow an employee three months - not three months less a day or two - to make a complaint of unfair dismissal. When one considers that the decision to lodge such a complaint is one not to be taken lightly, it is entirely to expected that the period should run from the time that the need to make such a decision is known to the employee.”