diff -r 522bf1c3dd7c -r f4034a59feaa bvv2cal
--- a/bvv2cal	Fri Nov 12 09:23:02 2010 +0100
+++ b/bvv2cal	Fri Nov 12 10:56:02 2010 +0100
@@ -41,6 +41,11 @@
 	["ß"] = "ss"
 }
 
+local function local2gmt(y, m, d, hour, min)
+	return os.date("%s", os.time { day=d, month=m, year=y, hour=hour, min=min })
+end
+
+
 local state = "waitcontent"
 local record, cell, result = { }, { }, { }
 local lnr = 1
@@ -78,8 +83,8 @@
 					end
 					if sH then
 						-- convert dates to GMT
-						local startdate = os.date("!%s", os.time { day=d, month=m, year=y, hour=sH, min=sM })
-						local enddate = eH and os.date("!%s", os.time { day=d, month=m, year=y, hour=eH, min=eM })
+						local startdate = local2gmt(y, m, d, sH, sM)
+						local enddate = eH and local2gmt(y, m, d, eH, eM)
 						local what = table.concat(record, " "):match("^%s*(.-)%s*$")
 						what = what:gsub("([\128-\255].)", umlconv)
 						table.insert(result, { startdate, enddate, what })
@@ -122,12 +127,12 @@
 for i = 1, #result do
 	local r = result[i]
 	print "BEGIN:VEVENT"
-	local startdate = os.date("%Y%m%dT%H%M", r[1])
+	local startdate = os.date("!%Y%m%dT%H%M", r[1])
 	print("UID:" .. startdate .. "." .. uid_uri)
 	print("SUMMARY:" .. r[3])
 	print("DTSTART:" .. startdate .. "00Z")
 	if r[2] then
-		local enddate = r[2] and os.date("%Y%m%dT%H%M", r[2])
+		local enddate = r[2] and os.date("!%Y%m%dT%H%M", r[2])
 		print("DTEND:" .. enddate .. "00Z")
 	end
 	print "END:VEVENT"