time: fixed the recursive local time call by check local time status

Signed-off-by: Vincenzo Palazzo <vincenzopalazzodev@gmail.com>

vlib/time/time.c.v

@@ -117,5 +117,9 @@ fn convert_ctime(t C.tm, microsecond int) Time {
 		second: t.tm_sec
 		microsecond: microsecond
 		unix: make_unix_time(t)
+		// for the actual code base when we
+		// call convert_ctime, it is always
+		// when we manage the local time.
+		is_local: true
 	}
 }

vlib/time/time.v

@@ -45,6 +45,7 @@ pub:
 	second      int
 	microsecond int
 	unix        i64
+	is_local    bool // used to make time.now().local().local() == time.now().local()
 }
 
 // FormatDelimiter contains different time formats.
@@ -348,7 +349,7 @@ pub fn (d Duration) str() string {
 
 // offset returns time zone UTC offset in seconds.
 pub fn offset() int {
-	t := now()
+	t := utc()
 	local := t.local()
 	return int(local.unix - t.unix)
 }

vlib/time/time_nix.c.v

@@ -30,6 +30,9 @@ fn make_unix_time(t C.tm) i64 {
 
 // local returns t with the location set to local time.
 pub fn (t Time) local() Time {
+	if t.is_local {
+		return t
+	}
 	loc_tm := C.tm{}
 	C.localtime_r(voidptr(&t.unix), &loc_tm)
 	return convert_ctime(loc_tm, t.microsecond)

vlib/time/time_test.v

@@ -259,23 +259,7 @@ fn test_since() {
 // problem: the local method add 2h on the time in a Linux machine
 // the other machine are not tested in a local env
 fn test_recursive_local_call() {
-	assert time.now().unix == time.now().local().unix
-	assert time.now().str() == time.now().local().str()
-	assert time.now().local().str() == time.now().local().local().str()
-}
-
-fn test_local_method_with_time_operation() {
-	//FIXME: add a fixed TIMEZONE here
-	assert time.now().str() != time.utc().str()
-	assert time.now().str() == time.utc().local().str()
-
-	utc := time.utc()
-	utc_plus_1h := time.utc().add(time.hour).local()
-
-	// check if the utc local is increased by 1h
-	assert utc_plus_1h.hour == time.now().local().hour - 1
-	// trivial check
-	assert utc.hour < utc_plus_1h.hour
-	// normal utc vs an 1h alterate utc + local convertion
-	assert utc.hour == utc_plus_1h.hour - 3
+	now_tm := time.now()
+	assert now_tm.str() == now_tm.local().str()
+	assert now_tm.local().str() == now_tm.local().local().str()
 }