--- a
+++ b/HRV.src/hours.c
@@ -0,0 +1,58 @@
+/* hours.c		Joe Mietus		Oct 7 2008 */
+
+/*
+hours :
+Usage: hours seconds | -
+  Convert seconds to hh:mm:ss.
+  `-' to read stdin
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+
+main(argc, argv)
+int argc;
+char *argv[];
+{
+    long sec, atol();
+    char *timstr();
+
+    if (argc < 2) {
+	usage(argv[0]);  
+	exit(1);
+    }
+
+    if (*argv[1] == '-')
+        switch (argv[1][1]) {
+	    case '\0' : while (scanf("%ld", &sec) == 1)
+	                    printf("%s\n", timstr(sec));
+		        exit(0);
+	    default : usage(argv[0]);
+		      exit(1);
+	}
+    else
+	printf("%s\n", timstr(atol(argv[1])));
+}
+
+
+char *timstr(time)	/* convert seconds to [hh:]mm:ss */
+long time;
+{
+    int hours, minutes, seconds;
+    static char buf[9];
+
+    hours = time / 3600L; time -= (long)hours * 3600;
+    minutes = time / 60;
+    seconds = time - minutes * 60;
+    sprintf(buf, "%02d:%02d:%02d", hours, minutes, seconds);
+    return (buf);
+}
+
+
+usage(prog)
+char *prog;
+{
+    fprintf(stderr, "Usage: %s seconds | -\n", prog);
+    fprintf(stderr, " Convert seconds to hh:mm:ss.\n");
+    fprintf(stderr, " `-' to read stdin\n");
+}