Dates in survex v1.1

[Andrew Atkinson]

Trying to compile some data from 1962 gives the following date error.

Survex 1.1.12
Copyright (C) 1990-2007 Olly Betts
F:\Andrew\Caving\Surveys\Co. 
Clare\Poulnagollum\Assemble\1962\MainStreamwayTributary2_30.svx:9: 
Invalid year (< 1970 or > 2037)
Survey has no fixed points. Therefore I've fixed 
mainstreamwaytributary2_30.0 at (0,0,0)

Survey contains 4 survey stations, joined by 3 legs.
There are 0 loops.
Total length of survey legs =   46.94m (  46.94m adjusted)
Total plan length of survey legs =   46.94m
Total vertical length of survey legs =    0.00m
Vertical range = 0.00m (from mainstreamwaytributary2_30.3 at 0.00m to 
mainstreamwaytributary2_30.3 at 0.00m)
North-South range = 27.45m (from mainstreamwaytributary2_30.0 at 0.00m 
to mainstreamwaytributary2_30.3 at -27.45m)
East-West range = 19.95m (from mainstreamwaytributary2_30.3 at 19.95m to 
mainstreamwaytributary2_30.0 at 0.00m)
    2 1-nodes.
    2 2-nodes.
There were 0 warning(s) and 1 non-fatal error(s) - no output files produced.

Checking the relevant line in the .svx file

*begin MainStreamwayTributary2_30
;Cave:Poulnagollum
;Survey Name:
;Description: 3 tributaries on right of main streamway below high/low road	
;		Infilled Canyon
;Location: The County Clare
;Country:Rep of Ireland
;People - BRC, PW, JES
*DATE 1962.4.17
;Instrument Set:Wire reinforced linen tape, RAF prismatic compass
;Calibration:

Does this mean we cannot use data from before 1970, what about after 2037?

This does does not cause a problem v1.0.39

Andrew