High-quality watches use most refined mechanisms to cope with the pitfalls of our complicated calendar system – well beyond our lifespan.
There are only very few movements that master the automatic switch from February 28 to March 1 – and even do not fail in leap years: every four years they grant February one additional day. Such a complication taking into account many cycles of different length is called a “perpetual calendar”. This title is not an exaggeration. Moon-phase displays as the one adorning Reference 5320G from Patek Philippe will only have to be adjusted by one day after 122 years and all perpetual calendar watches will only need a little correction in 2100 because there will be no leap year: a task to be assigned with joy to the proud heirs of this sophisticated mechanical masterpieces.