Well, yes, but that wasn't really the question that was asked - it was about monthlies (specifically those covering February).
Semi-related: In some ways it's a bit like the the problem that people born on 29th Feb have - are they legally a year older on 28th Feb or 1st March?
Oops, I seem to have committed the cardinal sin of not reading the post properly!
Anyway, as we have a calendar system that uses unequal months, then some months are going to offer better value than others.
So, yes, a monthly ticket bought on 30 Jan will have its last day of validity of29 Feb in a leap year, but 28 Feb in non leap years.
And similarly, a monthly ticket bought on 1 April will have one less day of validity compared to one bought on 1 August. But that is the price we have to pay for our system of dates.
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If an Outward journey starts at say 1000 on July 18th then a month runs to 0959 on Aug 18th so you don't get a full month currently, more so the later the Outward journey is. As it's impractical to use times tickets should be valid to the end of the same day in the following month, would that affect many people or could it be good publicity for very little cost? It must be better for passenger and TOC if it meant travelling on a quiet Saturday train instead of a packed Friday one.
There would still be the problem of soem months being longer than others!
I encountered quite a few people when in the ticket office were absolutely certain I had worngly issued their season ticket as a ticket issued on 2 Jan was only valid until 1 Jan the following year.
There seems to be a number of people who thing that there are 366 or 367 days in a year, 29, 30, 31 and 32 days in a month and 8 days in a week. If nothing else, this system will help them!
Of course it would also work the other so instead how about a general concession for 'Monthly Returns' if the last day of validity is a Friday they can also be used the next day? There may have to be a restriction to after 1200, or would it be so little used that iit's not worth worrying? It would be much easier if a "use by" date was printed on the Return ticket, it could be set to always give a full 31 days.
This getting a bit complicated now. All the TIS's would have to be reprogrammed in order to give passengers additional validity and therefore some revenue will be lost. I doubt that will be covered by additional passengers drawn to the railway by the extra generosity!
Can't see it happening sorry, and I'm not in favour of adding additional complications. As a customer, it's clear at the moment that if I'm going to New Zealand on 16 Feb, and arriving back on 19 March, I can't get a return to the airport. Under your sytem, I couldn't if it was leap year (I think) but not I could during the other years. Could be wrong though, I'm getting a headache trying to work out 31 days!