.TH MS_DOY2MD 3 2004/11/22 "Libmseed API"
.SH NAME
ms_doy2md - Convert between day of year and month and day of month

.SH SYNOPSIS
.nf
.B #include <libmseed.h>

.BI "int  \fBms_doy2md\fP ( int " year ", int " jday ", int *" month ", int *" mday " );"

.BI "int  \fBms_md2doy\fP ( int " year ", int " month ", int " mday ", int *" jday " );"
.fi

.SH DESCRIPTION
\fBms_doy2md\fP calculates the \fImonth\fP and day of month
(\fImday\fP) for a given \fIyear\fP and day of year (\fIjday\fP).

\fBms_md2doy\fP calculates the day of year (\fIjday\fP) for a given
\fIyear\fP, \fImonth\fP and day of month (\fImday\fP).

For both routines the expected and resulting ranges for each value are:
.sp
.nf
year  : 1900 - 2100
jday  : 1 - 366
month : 1 - 12
mday  : 1 - 31
.fi

A day of year of 366 corresponds to the last day of a leap year.

.SH RETURN VALUES
\fBms_doy2md\fP returns 0 on success and -1 on error.

\fBms_md2doy\fP returns 0 on success and -1 on error.

.SH AUTHOR
.nf
Chad Trabant
IRIS Data Management Center
.fi