date --date "Tue Apr 27 21:17:44 CEST 1999"
produces:
date: invalid date `Tue Apr 27 21:17:44 CEST 1999'

This is because CEST was accidentally omitted from
lib/getdate.c

Here is the patch. Please also inform the sh-utils mantainers.

Han Holl

--- sh-utils-1.16/lib/getdate.c.cest    Wed May 12 15:21:12 1999
+++ sh-utils-1.16/lib/getdate.c Wed May 12 15:22:48 1999
@@ -1612,6 +1612,7 @@
     { "nt",    tZONE,     HOUR (11) }, /* Nome */
     { "idlw",  tZONE,     HOUR (12) }, /* International Date Line West */
     { "cet",   tZONE,     -HOUR (1) }, /* Central European */
+    { "cest",  tDAYZONE,     -HOUR (1) },      /* Central European Summer
*/
     { "met",   tZONE,     -HOUR (1) }, /* Middle European */
     { "mewt",  tZONE,     -HOUR (1) }, /* Middle European Winter */
     { "mest",  tDAYZONE,  -HOUR (1) }, /* Middle European Summer */