.\" Modified 2001-11-13, aeb
.\" Modified 2004-12-01 mtk and Martin Schulze <joey@infodrom.org>
.\"
-.TH TZSET 3 2010-02-25 "" "Linux Programmer's Manual"
+.TH TZSET 3 2012-03-25 "" "Linux Programmer's Manual"
.SH NAME
tzset, tzname, timezone, daylight \- initialize time conversion information
.SH SYNOPSIS
.TP
J\fIn\fP
This specifies the Julian day with \fIn\fP between 1 and 365.
-February 29 is never counted even in leap years.
+Leap days are not counted.
+In this format, February 29 can't be represented;
+February 28 is day 59, and March 1 is always day 60.
.TP
.I n
-This specifies the Julian day with \fIn\fP between 1 and 365.
+This specifies the zero-based Julian day with \fIn\fP between 0 and 365.
February 29 is counted in leap years.
.TP
M\fIm\fP.\fIw\fP.\fId\fP