X-Git-Url: https://git.madduck.net/etc/awesome.git/blobdiff_plain/3a7693d5c89981e1230d0d49163fc23d02224873..e3d5c044607a407cc2ec0975f233879c71c50f94:/src/timetable.lua

diff --git a/src/timetable.lua b/src/timetable.lua
index 7e986a1..c71c59b 100644
--- a/src/timetable.lua
+++ b/src/timetable.lua
@@ -98,6 +98,17 @@ local function normalise ( year , month , day , hour , min , sec )
 	return year , month , day , hour , min , sec
 end
 
+local function timestamp ( year , month , day , hour , min , sec )
+	return 60*60*24*(
+			year * year_length ( year )
+			+ month * month_length ( month , year )
+			+ day
+		)
+		+ hour  * (60*60)
+		+ min   * 60
+		+ sec
+end
+
 
 local timetable_methods = { }
 
@@ -119,8 +130,21 @@ function timetable_methods:normalise ( )
 end
 timetable_methods.normalize = timetable_methods.normalise -- American English
 
+function timetable_methods:timestamp ( )
+	return timestamp ( unpack_tm ( self ) )
+end
+
+function timetable_methods:rfc_3339 ( )
+	-- %06.4g gives 3 (=6-4+1) digits after decimal
+	return strformat ( "%04u-%02u-%02uT%02u:%02u:%06.4g" , unpack_tm ( self ) )
+end
+
 local timetable_mt = {
 	__index    = timetable_methods ;
+	__tostring = timetable_methods.rfc_3339 ;
+	__eq = function ( a , b )
+		return a:timestamp() < b:timestamp()
+	end ;
 }
 
 local function cast_timetable ( tm )
@@ -141,6 +165,7 @@ end
 return {
 	doomsday  = doomsday ;
 	normalise = normalise ;
+	timestamp = timestamp ;
 
 	new = new_timetable ;
 	cast = cast_timetable ;