Make year-split follow different rules

vim/vimrc.statusline

@@ -9,26 +9,31 @@ function! GetYearGlyph()
     " 50 - 59 as \*0 - \*9
     " return %{strftime('%y')}[1]
 
-    let year= strftime('%Y')
+    let year_= strftime('%Y')
+    let base= 1930
+    let year= year_
     let decade= year / 10 % 10
-    let glyph=
-    \    ( year % 1000 ) > 100 ? decade :
+    let glyph_=
+    \    ( year < base ) ? "?" :
+    \    ( base + 200 <= year ) ? "?" :
+    \    ( base + 100 > year ) ?  decade :
     \        decade == 0 ? "`"     :
     \        decade == 1 ? "'"     :
     \        decade == 2 ? '"'     :
     \        decade == 3 ? "^"     :
     \        decade == 4 ? "~"     :
-    \        decade == 4 ? "~"     :
     \        decade == 5 ? "+"     :
     \        decade == 6 ? "*"     :
     \        decade == 7 ? "/"     :
-    \        decade == 7 ? "%"     :
-    \        decade == 7 ? "&"     :
+    \        decade == 8 ? "%"     :
+    \        decade == 9 ? "&"     :
     \        "?"
 
-    let year= year % 10
+    let glyph= glyph_
 
-    return glyph . year
+    let yearmod= year % 10
+
+    return glyph .. yearmod
 endfunction
 
 " This is a rebuild of the original vim status line.  I'll put the original
@@ -52,4 +57,4 @@ set statusline+=\ Syn:\ %2*%{SyntaxItem()}%0*     " Setup syntax highlighting gr
 set statusline+=\ %9*X=%02B                       " Current char byte val in hex
 
 "Lastly put the time in classic Magenta, like my TCSH prompt:
-set statusline+=\ %8*%{GetYearGlyph()}-%{strftime('%m-%d\ %H:%M')}
+set statusline+=\ %8*%02{GetYearGlyph()}-%{strftime('%m-%d\ %H:%M')}