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Message-ID: <AE583BF0F480F9D2360D51764C6A37CC@eigenstate.org>
To: 9front@9front.org
Subject: libc: date handling improvements
Date: Sat, 30 May 2020 20:39:14 -0700
From: ori@eigenstate.org
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X-Bullshit: strategy database 

I implemented libdate -- but the right place to put
it is in libc, replacing our ctime and gmtime apis.

Follow ups will replace seconds(1), upas time parsing
code, and whatever other instances of hand rolled date
parsing and formatting can be found.

Here's a patch that does this. Testing appreciated,
and follow ups that I haven't done yet would also be
great :)

diff -r d45cfe9072cd sys/include/libc.h
--- a/sys/include/libc.h	Sat May 30 13:03:05 2020 +0200
+++ b/sys/include/libc.h	Sat May 30 20:38:10 2020 -0700
@@ -314,22 +314,45 @@
 /*
  * Time-of-day
  */
+typedef struct Tzone Tzone;
+#pragma incomplete Tzone
+
 
 typedef
 struct Tm
 {
-	int	sec;
-	int	min;
-	int	hour;
-	int	mday;
-	int	mon;
-	int	year;
-	int	wday;
-	int	yday;
-	char	zone[4];
-	int	tzoff;
+	vlong	abs;		/* seconds since Jan 1 1970, GMT */
+	int	nsec;		/* nseconds (range 0...1e9) */
+	int	sec;		/* seconds (range 0..60) */
+	int	min;		/* minutes (0..59) */
+	int	hour;		/* hours (0..23) */
+	int	mday;		/* day of the month (1..31) */
+	int	mon;		/* month of the year (0..11) */
+	int	year;		/* year A.D. */
+	int	wday;		/* day of week (0..6, Sunday = 0) */
+	int	yday;		/* day of year (0..365) */
+	char	zone[16];	/* time zone name */
+	int	tzoff;		/* time zone delta from GMT */
+	Tzone	*tz;		/* time zone associated with this date */
 } Tm;
 
+typedef
+struct Tmfmt {
+	char	*fmt;
+	Tm	*tm;
+} Tmfmt;
+
+#pragma varargck	type	"τ"	Tmfmt
+
+extern	Tzone*	tmgetzone(char *name);
+extern	Tm*	tmnow(Tm*, Tzone*);
+extern	Tm*	tmtime(Tm*, vlong, Tzone*);
+extern	Tm*	tmtimens(Tm*, vlong, int, Tzone*);
+extern	Tm*	tmparse(Tm*, char*, char*, Tzone*);
+extern	Tm*	tmnorm(Tm*);
+extern	Tmfmt	tmfmt(Tm*, char*);
+extern	void	tmfmtinstall(void);
+
 extern	Tm*	gmtime(long);
 extern	Tm*	localtime(long);
 extern	char*	asctime(Tm*);
diff -r d45cfe9072cd sys/src/libc/9sys/mkfile
--- a/sys/src/libc/9sys/mkfile	Sat May 30 13:03:05 2020 +0200
+++ b/sys/src/libc/9sys/mkfile	Sat May 30 20:38:10 2020 -0700
@@ -10,7 +10,6 @@
 	convM2S.$O\
 	convS2M.$O\
 	cputime.$O\
-	ctime.$O\
 	dial.$O\
 	dirfstat.$O\
 	dirfwstat.$O\
@@ -47,7 +46,6 @@
 	sysname.$O\
 	time.$O\
 	times.$O\
-	tm2sec.$O\
 	truerand.$O\
 	wait.$O\
 	waitpid.$O\
diff -r d45cfe9072cd sys/src/libc/port/date.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/src/libc/port/date.c	Sat May 30 20:38:10 2020 -0700
@@ -0,0 +1,872 @@
+#include <u.h>
+#include <libc.h>
+
+typedef struct Tzabbrev Tzabbrev;
+typedef struct Tzoffpair Tzoffpair;
+
+#define Ctimefmt "W MMM _D hh:mm:ss ZZZ YYYY\n"
+enum {
+	Tzsize		= 150,
+	Nsec		= 1000*1000*1000,
+	Daysec		= (vlong)24*3600,
+	Days400y	= 365*400 + 4*25 - 3,
+	Days4y		= 365*4 + 1,
+};
+
+enum {
+	Cend,
+	Cspace,
+	Cnum,
+	Cletter,
+	Cpunct,
+};
+	
+struct Tzone {
+	char	tzname[16];
+	char	stname[4];
+	char	dlname[4];
+	long	stdiff;
+	long	dldiff;
+	long	dlpairs[Tzsize];
+};
+
+static char tfmt[128];
+static QLock zlock;
+static int nzones;
+static Tzone **zones;
+static int mdays[] = {
+	31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
+};
+static char *wday[] = {
+	"Sunday","Monday","Tuesday",
+	"Wednesday","Thursday","Friday",
+	"Saturday", nil,
+};
+static char *month[] = {
+	"January", "February", "March",
+	"April", "May", "June", "July",
+	"August", "September", "October",
+	"November", "December", nil
+};
+
+struct Tzabbrev {
+	char *abbr;
+	char *name;
+};
+
+struct Tzoffpair {
+	char *abbr;
+	int off;
+};
+
+/* Obsolete time zone names. Hardcoded to match RFC5322 */
+static Tzabbrev tzabbrev[] = {
+	{"UT", "GMT"}, {"GMT", "GMT"}, {"UTC", "GMT"},
+	{"EST",	"US_Eastern"}, {"EDT", "US_Eastern"},
+	{"CST", "US_Central"}, {"CDT", "US_Central"},
+	{"MST", "US_Mountain"}, {"MDT", "US_Mountain"},
+	{"PST", "US_Pacific"}, {"PDT", "US_Pacific"},
+	{nil},
+};
+
+/* Military timezone names */
+static Tzoffpair milabbrev[] = {
+	{"A", -1*3600},   {"B", -2*3600},   {"C", -3*3600},
+	{"D", -4*3600},   {"E", -5*3600},   {"F", -6*3600},
+	{"G", -7*3600},   {"H", -8*3600},   {"I", -9*3600},
+	{"K", -10*3600},  {"L", -11*3600},  {"M", -12*3600},
+	{"N", +1*3600},   {"O", +2*3600},   {"P", +3*3600},
+	{"Q", +4*3600},   {"R", +5*3600},   {"S", +6*3600},
+	{"T", +7*3600},   {"U", +8*3600},   {"V", +9*3600},
+	{"W", +10*3600},  {"X", +11*3600}, {"Y", +12*3600},
+	{"Z",	0}, {nil, 0}
+};
+
+static int
+isleap(int y)
+{
+	return y % 4 == 0 && (y % 100 != 0 || y % 400 == 0);
+}
+
+static int
+rdname(char **f, char *p)
+{
+	int c, i;
+
+	while((c = *(*f)++) != 0)
+		if(c != ' ' && c != '\n')
+			break;
+	for(i=0; i<3; i++) {
+		if(c == ' ' || c == '\n')
+			return 1;
+		*p++ = c;
+		c = *(*f)++;
+	}
+	if(c != ' ' && c != '\n')
+		return 1;
+	*p = 0;
+	return 0;
+}
+
+static int
+rdlong(char **f, long *p)
+{
+	int c, s;
+	long l;
+
+	s = 0;
+	while((c = *(*f)++) != 0){
+		if(c == '-')
+			s++;
+		else if(c != ' ' && c != '\n')
+			break;
+	}
+	if(c == 0) {
+		*p = 0;
+		return 0;
+	}
+	l = 0;
+	for(;;) {
+		if(c == ' ' || c == '\n')
+			break;
+		if(c < '0' || c > '9')
+			return 1;
+		l = l*10 + c-'0';
+		c = *(*f)++;
+	}
+	if(s)
+		l = -l;
+	*p = l;
+	return 0;
+}
+
+static int
+loadzone(Tzone *tz, char *name)
+{
+	char buf[Tzsize*11+30], path[128], *p;
+	int i, f, r;
+
+	if(strcmp(name, "local") == 0)
+		snprint(path, sizeof(path), "/env/timezone");
+	else
+		snprint(path, sizeof(path), "/adm/timezone/%s", name);
+	memset(buf, 0, sizeof(buf));
+	if((f = open(path, 0)) == -1)
+		return -1;
+	r = read(f, buf, sizeof(buf));
+	close(f);
+	if(r == sizeof(buf) || r == -1)
+		return -1;
+	p = buf;
+	if(rdname(&p, tz->stname))
+		return -1;
+	if(rdlong(&p, &tz->stdiff))
+		return -1;
+	if(rdname(&p, tz->dlname))
+		return -1;
+	if(rdlong(&p, &tz->dldiff))
+		return -1;
+	for(i=0; i < Tzsize; i++) {
+		if(rdlong(&p, &tz->dlpairs[i]))
+			return -1;
+		if(tz->dlpairs[i] == 0)
+			return 0;
+	}
+	return -1;
+}
+
+Tzone*
+tmgetzone(char *tzname)
+{
+	Tzone *tz, **newzones;
+	int i;
+
+	if(tzname == nil)
+		tzname = "GMT";
+	qlock(&zlock);
+	for(i = 0; i < nzones; i++){
+		tz = zones[i];
+		if(strcmp(tz->stname, tzname) == 0)
+			goto found;
+		if(strcmp(tz->dlname, tzname) == 0)
+			goto found;
+		if(strcmp(tz->tzname, tzname) == 0)
+			goto found;
+	}
+
+	tz = malloc(sizeof(Tzone));
+	if(tz == nil)
+		goto error;
+	newzones = realloc(zones, (nzones + 1) * sizeof(Tzone*));
+	if(newzones == nil)	
+		goto error;
+	if(loadzone(tz, tzname) != 0)
+		goto error;
+	if(snprint(tz->tzname, sizeof(tz->tzname), tzname) >= sizeof(tz->tzname)){
+		werrstr("timezone name too long");
+		return nil;
+	}
+	zones = newzones;
+	zones[nzones] = tz;
+	nzones++;
+found:
+	qunlock(&zlock);
+	return tz;
+error:
+	free(tz);
+	qunlock(&zlock);
+	return nil;
+}
+
+static void
+getzoneoff(Tzone *tz, vlong abs, Tm *tm)
+{
+	long dl, *p;
+	dl = 0;
+	if(tz == nil){
+		snprint(tm->zone, sizeof(tm->zone), "GMT");
+		tm->tzoff = 0;
+		return;
+	}
+	for(p = tz->dlpairs; *p; p += 2)
+		if(abs >= p[0] && abs < p[1])
+			dl = 1;
+	if(dl){
+		snprint(tm->zone, sizeof(tm->zone), tz->dlname);
+		tm->tzoff = tz->dldiff;
+	}else{
+		snprint(tm->zone, sizeof(tm->zone), tz->stname);
+		tm->tzoff = tz->stdiff;
+	}
+}
+
+static Tm*
+tmfill(Tm *tm, vlong abs, vlong nsec)
+{
+	vlong zrel, j, y, m, d, t, e;
+	int i;
+
+	tm->abs = abs;
+	zrel = abs + tm->tzoff;
+	t = zrel % Daysec;
+	e = zrel / Daysec;
+	if(t < 0){
+		t += Daysec;
+		e -= 1;
+	}
+
+	t += nsec/Nsec;
+	tm->sec = t % 60;
+	t /= 60;
+	tm->min = t % 60;
+	t /= 60;
+	tm->hour = t;
+	tm->wday = (e + 4) % 7;
+
+	/*
+	 * Split up year, month, day.
+	 * 
+	 * Implemented according to "Algorithm 199,
+	 * conversions between calendar  date and
+	 * Julian day number", Robert G. Tantzen,
+	 * Air Force Missile Development
+	 * Center, Holloman AFB, New Mex.
+	 * 
+	 * Lots of magic.
+	 */
+	j = (zrel + 2440588 * Daysec) / (Daysec) - 1721119;
+	y = (4 * j - 1) / Days400y;
+	j = 4 * j - 1 - Days400y * y;
+	d = j / 4;
+	j = (4 * d + 3) / Days4y;
+	d = 4 * d + 3 - Days4y * j;
+	d = (d + 4) / 4 ;
+	m = (5 * d - 3) / 153;
+	d = 5 * d - 3 - 153 * m;
+	d = (d + 5) / 5;
+	y = 100 * y + j;
+
+	if(m < 10)
+		m += 3;
+	else{
+		m -= 9;
+		y++;
+	}
+
+	/* there's no year 0 */
+	if(y <= 0)
+		y--;
+	/* and if j negative, the day and month are also negative */
+	if(m < 0)
+		m += 12;
+	if(d < 0)
+		d += mdays[m - 1];
+
+	tm->yday = d;
+	for(i = 0; i < m - 1; i++)
+		tm->yday += mdays[i];
+	if(m > 1 && y % 4 == 0 && (y % 100 != 0 || y % 400 == 0))
+		tm->yday++;
+	tm->year = y;
+	tm->mon = m - 1;
+	tm->mday = d;
+	tm->nsec = nsec%Nsec;
+	return tm;
+}	
+
+
+Tm*
+tmtime(Tm *tm, vlong abs, Tzone *tz)
+{
+	return tmtimens(tm, abs, 0, tz);
+}
+
+Tm*
+tmtimens(Tm *tm, vlong abs, int ns, Tzone *tz)
+{
+	tm->tz = tz;
+	getzoneoff(tz, abs, tm);
+	return tmfill(tm, abs, ns);
+}
+
+Tm*
+tmnow(Tm *tm, Tzone *tz)
+{
+	vlong ns;
+
+	ns = nsec();
+	return tmtimens(tm, nsec()/Nsec, ns%Nsec, tz);
+}
+
+Tm*
+tmnorm(Tm *tm)
+{
+	vlong c, yadj, j, abs, y, m, d;
+
+	if(tm->mon > 1){
+		m = tm->mon - 2;
+		y = tm->year;
+	}else{
+		m = tm->mon + 10;
+		y = tm->year - 1;
+	}
+	d = tm->mday;
+	c = y / 100;
+	yadj = y - 100 * c;
+	j = (c * Days400y / 4 + 
+		Days4y * yadj / 4 +
+		(153 * m + 2)/5 + d -
+		719469);
+	abs = j * Daysec;
+	abs += tm->hour * 3600;
+	abs += tm->min * 60;
+	abs += tm->sec;
+	abs -= tm->tzoff;
+	return tmfill(tm, abs, tm->nsec);
+}
+
+static int
+τconv(Fmt *f)
+{
+	int depth, n, w, h, m, c0, sgn, pad, off;
+	char *p, *am;
+	Tmfmt tf;
+	Tm *tm;
+
+	n = 0;
+	tf = va_arg(f->args, Tmfmt);
+	tm = tf.tm;
+	p = tf.fmt;
+	if(p == nil)
+		p = Ctimefmt;
+	while(*p){
+		w = 1;
+		pad = 0;
+		while(*p == '_'){
+			pad++;
+			p++;
+		}
+		c0 = *p++;
+		while(c0 && *p == c0){
+			w++;
+			p++;
+		}
+		pad += w;
+		switch(c0){
+		case 0:
+			break;
+		case 'Y':
+			switch(w){
+			case 1:	n += fmtprint(f, "%*d", pad, tm->year);			break;
+			case 2: n += fmtprint(f, "%*d", pad, tm->year % 100);		break;
+			case 4:	n += fmtprint(f, "%*d", pad, tm->year);			break;
+			default: goto badfmt;
+			}
+			break;
+		case 'M':
+			switch(w){
+			case 1: n += fmtprint(f, "%*d", pad, tm->mon + 1);		break;
+			case 2:	n += fmtprint(f, "%*s%02d", pad-2, "", tm->mon + 1);	break;
+			case 3:	n += fmtprint(f, "%*.3s", pad, month[tm->mon]);		break;
+			case 4:	n += fmtprint(f, "%*s", pad, month[tm->mon]);		break;
+			default: goto badfmt;
+			}
+			break;
+		case 'D':
+			switch(w){
+			case 1: n += fmtprint(f, "%*d", pad, tm->mday);			break;
+			case 2:	n += fmtprint(f, "%*s%02d", pad-2, "", tm->mday);		break;
+			default: goto badfmt;
+			}
+			break;
+		case 'W':
+			switch(w){
+			case 1:	n += fmtprint(f, "%*.3s", pad, wday[tm->wday]);	break;
+			case 2:	n += fmtprint(f, "%*s", pad, wday[tm->wday]);		break;
+			default: goto badfmt;
+			}
+			break;
+		case 'H':
+			switch(w){
+			case 1: n += fmtprint(f, "%*d", pad, tm->hour % 12);		break;
+			case 2:	n += fmtprint(f, "%*s%02d", pad-2, "", tm->hour % 12);	break;
+			default: goto badfmt;
+			}
+			break;
+		case 'h':
+			switch(w){
+			case 1: n += fmtprint(f, "%*d", pad, tm->hour);			break;
+			case 2:	n += fmtprint(f, "%*s%02d", pad-2, "", tm->hour);	break;
+			default: goto badfmt;
+			}
+			break;
+		case 'm':
+			switch(w){
+			case 1: n += fmtprint(f, "%*d", pad, tm->min);			break;
+			case 2:	n += fmtprint(f, "%*s%02d", pad-2, "", tm->min);	break;
+			default: goto badfmt;
+			}
+			break;
+		case 's':
+			switch(w){
+			case 1: n += fmtprint(f, "%*d", pad, tm->sec);			break;
+			case 2:	n += fmtprint(f, "%*s%02d", pad-2, "", tm->sec);	break;
+			default: goto badfmt;
+			}
+			break;
+		case 'z':
+			if(w != 1)
+				goto badfmt;
+		case 'Z':
+			sgn = (tm->tzoff < 0) ? '-' : '+';
+			off = (tm->tzoff < 0) ? -tm->tzoff : tm->tzoff;
+			h = off/3600;
+			m = (off/60)%60;
+			if(w < 3 && pad < 5)
+				pad = 5;
+			switch(w){
+			case 1:	n += fmtprint(f, "%*s%c%02d%02d", pad-5, "", sgn, h, m); break;
+			case 2:	n += fmtprint(f, "%*s%c%02d:%02d", pad-5, "", sgn, h, m); break;
+			case 3:	n += fmtprint(f, "%*s", pad, tm->zone);			 break;
+			}
+			break;
+		case 'A':
+		case 'a':
+			if(w != 1)
+				goto badfmt;
+			if(c0 == 'a')
+				am = (tm->hour < 12) ? "am" : "pm";
+			else
+				am = (tm->hour < 12) ? "AM" : "PM";
+			n += fmtprint(f, "%*s", pad, am);
+			break;
+		case '[':
+			depth = 1;
+			while(*p){
+				if(*p == '[')
+					depth++;
+				if(*p == ']')
+					depth--;
+				if(*p == '\\')
+					p++;
+				if(depth == 0)
+					break;
+				fmtrune(f, *p++);
+			}
+			if(*p++ != ']')
+				goto badfmt;
+			break;
+		default:
+			n += fmtrune(f, c0);
+			break;
+		}
+	}
+	return n;
+badfmt:
+	werrstr("garbled format %s", tf.fmt);
+	return -1;			
+}
+
+static int
+getnum(char **ps, int maxw, int *ok)
+{
+	char *s, *e;
+	int n;
+
+	n = 0;
+	e = *ps + maxw;
+	for(s = *ps; s != e && *s >= '0' && *s <= '9'; s++){
+		n *= 10;
+		n += *s - '0';
+	}
+	*ok = s != *ps;
+	*ps = s;
+	return n;
+}
+
+static int
+lookup(char **s, char **tab, int len, int *ok)
+{
+	int nc, i;
+
+	*ok = 0;
+	for(i = 0; *tab; tab++){
+		nc = (len != -1) ? len : strlen(*tab);
+		if(cistrncmp(*s, *tab, nc) == 0){
+			*s += nc;
+			*ok = 1;
+			return i;
+		}
+		i++;
+	}
+	*ok = 0;
+	return -1;
+}
+
+Tm*
+tmparse(Tm *tm, char *fmt, char *str, Tzone *tz)
+{
+	int depth, w, c0, zs, z0, z1, ampm, zoned, sloppy, tzo, ok;
+	char *s, *p, *q;
+	Tzone *zparsed;
+	Tzabbrev *a;
+	Tzoffpair *m;
+
+	p = fmt;
+	s = str;
+	tzo = 0;
+	ampm = -1;
+	zoned = 0;
+	zparsed = nil;
+	sloppy = 0;
+	/* Default all fields */
+	tmtime(tm, 0, nil);
+	if(*p == '~'){
+		sloppy = 1;
+		p++;
+	}
+	while(*p){
+		w = 1;
+		c0 = *p++;
+		if(c0 == '?'){
+			w = -1;
+			c0 = *p++;
+		}
+		while(*p == c0){
+			if(w != -1) w++;
+			p++;
+		}
+		ok = 1;
+		switch(c0){
+		case 'Y':
+			switch(w){
+			case -1:
+				tm->year = getnum(&s, 4, &ok);
+				if(tm->year < 100) tm->year += 1900;
+				break;
+			case 1:	tm->year = getnum(&s, 4, &ok);		break;
+			case 2: tm->year = getnum(&s, 2, &ok) + 1900;	break;
+			case 3:
+			case 4:	tm->year = getnum(&s, 4, &ok);		break;
+			default: goto badfmt;
+			}
+			break;
+		case 'M':
+			switch(w){
+			case -1:
+				tm->mon = getnum(&s, 2, &ok) - 1;
+				if(!ok) tm->mon = lookup(&s, month, -1, &ok);
+				if(!ok) tm->mon = lookup(&s, month, 3, &ok);
+				break;
+			case 1:
+			case 2: tm->mon = getnum(&s, 2, &ok) - 1;	break;
+			case 3:	tm->mon = lookup(&s, month, 3, &ok);	break;
+			case 4:	tm->mon = lookup(&s, month, -1, &ok);	break;
+			default: goto badfmt;
+			}
+			break;
+		case 'D':
+			switch(w){
+			case -1:
+			case 1:
+			case 2: tm->mday = getnum(&s, 2, &ok);		break;
+			default: goto badfmt;
+			}
+			break;
+		case 'W':
+			switch(w){
+			case -1:
+				tm->wday = lookup(&s, wday, -1, &ok);
+				if(!ok) tm->wday = lookup(&s, wday, 3, &ok);
+				break;
+			case 1:	tm->wday = lookup(&s, wday, 3, &ok);	break;
+			case 2:	tm->wday = lookup(&s, wday, -1, &ok);	break;
+			default: goto badfmt;
+			}
+			break;
+		case 'h':
+			switch(w){
+			case -1:
+			case 1:
+			case 2: tm->hour = getnum(&s, 2, &ok);		break;
+			default: goto badfmt;
+			}
+			break;
+		case 'm':
+			switch(w){
+			case -1:
+			case 1:
+			case 2: tm->min = getnum(&s, 2, &ok);		break;
+			default: goto badfmt;
+			}
+			break;
+		case 's':
+			switch(w){
+			case -1:
+			case 1:
+			case 2: tm->sec = getnum(&s, 2, &ok);		break;
+			default: goto badfmt;
+			}
+			break;
+		case 'z':
+			if(w != 1)
+				goto badfmt;
+		case 'Z':
+			zs = 0;
+			zoned = 1;
+			switch(*s++){
+			case '+': zs = 1; break;
+			case '-': zs = -1; break;
+			default: s--; break;
+			}
+			switch(w){
+			case -1:
+			case 3:
+				for(a = tzabbrev; a->abbr; a++)
+					if(strncmp(s, a->abbr, strlen(a->abbr)) == 0)
+						break;
+				if(a->abbr != nil){
+					s += strlen(a->abbr);
+					zparsed = tmgetzone(a->name);
+					if(zparsed == nil){
+						werrstr("unloadable zone %s (%s)", a->abbr, a->name);
+						return nil;
+					}
+					break;
+				}
+				for(m = milabbrev; m->abbr != nil; m++)
+					if(strncmp(s, m->abbr, strlen(m->abbr)) == 0)
+						break;
+				if(m->abbr != nil){
+					snprint(tm->zone, sizeof(tm->zone), "%s", m->abbr);
+					tzo = m->off;
+					break;
+				}
+				/* fall through */
+			case 1:
+				/* offset: [+-]hhmm */
+				q = s;
+				z0 = getnum(&s, 4, &ok);
+				if(s - q == 4){
+					z1 = z0 % 100;
+					if(z0/100 > 13 || z1 >= 60)
+						goto baddate;
+					tzo = zs*(3600*z0/100 + 60*z1);
+					snprint(tm->zone, sizeof(tm->zone), "%c%02d%02d", zs<0?'-':'+', z0/100, z1);
+					break;
+				}
+				if(w != -1)
+					goto baddate;
+				s = q;
+				/* fall through */
+			case 2:
+				/* offset: [+-]hh:mm */
+				z0 = getnum(&s, 2, &ok);
+				if(*s++ != ':')
+					goto baddate;
+				z1 = getnum(&s, 2, &ok);
+				if(z1 > 60)
+					goto baddate;
+				tzo = zs*(3600*z0 + 60*z1);
+				snprint(tm->zone, sizeof(tm->zone), "%c%d02:%02d", zs<0?'-':'+', z0, z1);
+				break;
+			}
+			break;
+		case 'A':
+		case 'a':
+			if(cistrncmp(s, "am", 2) == 0)
+				ampm = 0;
+			else if(cistrncmp(s, "pm", 2) == 0)
+				ampm = 1;
+			else
+				goto baddate;
+			break;
+		case '[':
+			depth = 1;
+			while(*p){
+				if(*p == '[')
+					depth++;
+				if(*p == ']')
+					depth--;
+				if(*p == '\\')
+					p++;
+				if(depth == 0)
+					break;
+				if(*s == 0)
+					goto baddate;
+				if(*s++ != *p++)
+					goto baddate;
+			}
+			if(*p != ']')
+				goto badfmt;
+			p++;
+			break;
+		case ',':
+		case ' ':
+		case '\t':
+			if(*s != ' ' && *s != '\t' && *s != ',')
+				goto baddate;
+			while(*p == ' ' || *p == '\t' || *p == ',')
+				p++;
+			while(*s == ' ' || *s == '\t' || *p == ',')
+				s++;
+			break;
+		default:
+			if(*s == 0)
+				goto baddate;
+			if(*s++ != c0)
+				goto baddate;
+			break;
+		}
+		if(!ok)
+			goto baddate;
+	}
+	
+	if(!sloppy && ampm != -1 && tm->hour > 12)
+		goto baddate;
+	if(ampm == 1)
+		tm->hour += 12;
+	/*
+	 * If we're allowing sloppy date ranges,
+	 * we'll normalize out of range values.
+	 */
+	if(!sloppy){
+		if(tm->yday < 0 && tm->yday > 365 + isleap(tm->year))
+			goto baddate;
+		if(tm->wday < 0 && tm->wday > 6)
+			goto baddate;
+		if(tm->mon < 0 || tm->mon > 11)
+			goto baddate;
+		if(tm->mday < 0 || tm->mday > mdays[tm->mon])
+			goto baddate;
+		if(tm->hour < 0 || tm->hour > 24)
+			goto baddate;
+		if(tm->min < 0 || tm->min > 59)
+			goto baddate;
+		if(tm->sec < 0 || tm->sec > 60)
+			goto baddate;
+		if(tm->nsec < 0 || tm->nsec > Nsec)
+			goto baddate;
+	}
+
+	/*
+	 * Normalizing gives us the local time,
+	 * but because we havnen't applied the
+	 * timezone, we think we're GMT. So, we
+	 * need to shift backwards. Then, we move
+	 * the "GMT that was local" back to local
+	 * time.
+	 */
+ 	tmnorm(tm);
+	tm->tzoff = tzo;
+	if(!zoned)
+		getzoneoff(tz, tm->abs, tm);
+	else if(zparsed != nil)
+		getzoneoff(zparsed, tm->abs, tm);
+	tm->abs -= tm->tzoff;
+	if(tz != nil || !zoned)
+		tmtime(tm, tm->abs, tz);
+	return tm;
+baddate:
+	werrstr("invalid date %s near '%c'", str, *p);
+	return nil;
+badfmt:
+	werrstr("garbled format %s near '%s'", fmt, p);
+	return nil;			
+}
+
+Tmfmt
+tmfmt(Tm *d, char *fmt)
+{
+	return (Tmfmt){fmt, d};
+}
+
+void
+tmfmtinstall(void)
+{
+	fmtinstall(L'τ', τconv);
+}
+
+/* These legacy functions need access to τconv */
+static char*
+dotmfmt(Fmt *f, ...)
+{
+	static char buf[30];
+	va_list ap;
+
+	va_start(ap, f);
+	f->runes = 0;
+	f->start = buf;
+	f->to = buf;
+	f->stop = buf + sizeof(buf) - 1;
+	f->flush = nil;
+	f->farg = nil;
+	f->nfmt = 0;
+	f->args = ap;
+	τconv(f);
+	va_end(ap);
+	buf[sizeof(buf) - 1] = 0;
+	return buf;
+}
+
+char*
+asctime(Tm* tm)
+{
+	Tmfmt tf;
+	Fmt f;
+
+	tf = tmfmt(tm, nil);
+	return dotmfmt(&f, tf);
+}
+
+char*
+ctime(long abs)
+{
+	Tzone *tz;
+	Tm tm;
+
+	/* No error checking: the API doesn't allow it. */
+	tz = tmgetzone("local");
+	tmtime(&tm, abs, tz);
+	return asctime(&tm);
+}
diff -r d45cfe9072cd sys/src/libc/port/gmtime.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/src/libc/port/gmtime.c	Sat May 30 20:38:10 2020 -0700
@@ -0,0 +1,26 @@
+#include<u.h>
+#include <libc.h>
+
+Tm*
+gmtime(long abs)
+{
+	static Tm tm;
+	return tmtime(&tm, abs, nil);
+}
+
+Tm*
+localtime(long abs)
+{
+	Tzone *tz;
+	static Tm tm;
+
+	/* No error checking: the API doesn't allow it. */
+	tz = tmgetzone("local");
+	return tmtime(&tm, abs, tz);
+}
+
+long
+tm2sec(Tm *tm)
+{
+	return tm->abs;
+}
diff -r d45cfe9072cd sys/src/libc/port/mkfile
--- a/sys/src/libc/port/mkfile	Sat May 30 13:03:05 2020 +0200
+++ b/sys/src/libc/port/mkfile	Sat May 30 20:38:10 2020 -0700
@@ -20,6 +20,7 @@
 	cleanname.c\
 	crypt.c\
 	ctype.c\
+	date.c\
 	encodefmt.c\
 	execl.c\
 	exits.c\
@@ -32,6 +33,7 @@
 	getcallerpc.c\
 	getfields.c\
 	getuser.c\
+	gmtime.c\
 	hangup.c\
 	hypot.c\
 	lnrand.c\