diff --git a/libc/tzcode/difftime.c b/libc/tzcode/difftime.c
index da77977..f7581a4 100644
--- a/libc/tzcode/difftime.c
+++ b/libc/tzcode/difftime.c
@@ -5,61 +5,61 @@
 
 #ifndef lint
 #ifndef NOID
-static char	elsieid[] = "@(#)difftime.c	8.1";
+static char elsieid[] = "@(#)difftime.c 8.1";
 #endif /* !defined NOID */
 #endif /* !defined lint */
 
 /*LINTLIBRARY*/
 
-#include "private.h"	/* for time_t, TYPE_INTEGRAL, and TYPE_SIGNED */
+#include "private.h"    /* for time_t, TYPE_INTEGRAL, and TYPE_SIGNED */
 
 double
 difftime(time1, time0)
-const time_t	time1;
-const time_t	time0;
+const time_t    time1;
+const time_t    time0;
 {
-	/*
-	** If (sizeof (double) > sizeof (time_t)) simply convert and subtract
-	** (assuming that the larger type has more precision).
-	** This is the common real-world case circa 2004.
-	*/
-	if (sizeof (double) > sizeof (time_t))
-		return (double) time1 - (double) time0;
-	if (!TYPE_INTEGRAL(time_t)) {
-		/*
-		** time_t is floating.
-		*/
-		return time1 - time0;
-	}
-	if (!TYPE_SIGNED(time_t)) {
-		/*
-		** time_t is integral and unsigned.
-		** The difference of two unsigned values can't overflow
-		** if the minuend is greater than or equal to the subtrahend.
-		*/
-		if (time1 >= time0)
-			return time1 - time0;
-		else	return -((double) (time0 - time1));
-	}
-	/*
-	** time_t is integral and signed.
-	** Handle cases where both time1 and time0 have the same sign
-	** (meaning that their difference cannot overflow).
-	*/
-	if ((time1 < 0) == (time0 < 0))
-		return time1 - time0;
-	/*
-	** time1 and time0 have opposite signs.
-	** Punt if unsigned long is too narrow.
-	*/
-	if (sizeof (unsigned long) < sizeof (time_t))
-		return (double) time1 - (double) time0;
-	/*
-	** Stay calm...decent optimizers will eliminate the complexity below.
-	*/
-	if (time1 >= 0 /* && time0 < 0 */)
-		return (unsigned long) time1 +
-			(unsigned long) (-(time0 + 1)) + 1;
-	return -(double) ((unsigned long) time0 +
-		(unsigned long) (-(time1 + 1)) + 1);
+    /*
+    ** If (sizeof (double) > sizeof (time_t)) simply convert and subtract
+    ** (assuming that the larger type has more precision).
+    ** This is the common real-world case circa 2004.
+    */
+    if (sizeof (double) > sizeof (time_t))
+        return (double) time1 - (double) time0;
+    if (!TYPE_INTEGRAL(time_t)) {
+        /*
+        ** time_t is floating.
+        */
+        return time1 - time0;
+    }
+    if (!TYPE_SIGNED(time_t)) {
+        /*
+        ** time_t is integral and unsigned.
+        ** The difference of two unsigned values can't overflow
+        ** if the minuend is greater than or equal to the subtrahend.
+        */
+        if (time1 >= time0)
+            return time1 - time0;
+        else    return -((double) (time0 - time1));
+    }
+    /*
+    ** time_t is integral and signed.
+    ** Handle cases where both time1 and time0 have the same sign
+    ** (meaning that their difference cannot overflow).
+    */
+    if ((time1 < 0) == (time0 < 0))
+        return time1 - time0;
+    /*
+    ** time1 and time0 have opposite signs.
+    ** Punt if unsigned long is too narrow.
+    */
+    if (sizeof (unsigned long) < sizeof (time_t))
+        return (double) time1 - (double) time0;
+    /*
+    ** Stay calm...decent optimizers will eliminate the complexity below.
+    */
+    if (time1 >= 0 /* && time0 < 0 */)
+        return (unsigned long) time1 +
+            (unsigned long) (-(time0 + 1)) + 1;
+    return -(double) ((unsigned long) time0 +
+        (unsigned long) (-(time1 + 1)) + 1);
 }