[Info-vax] Significance of 2020 / 2021 date

[issinoho]

We have some old 90s VAX C code which rejects any dates after the year 2020 so, as you can imagine this has now kicked in. The system was ported from VAX to IA64 years ago and we've only just discovered this.

Question: is there any inherent architectural or numerical significance behind this, or was this simply 'a date a long time away' when it was coded?

Your wisdom, as always, is appreciated.

TIA