X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Ftime%2Fdatetime.cpp;h=86238863282340996339071236f51b4a212e193f;hb=48c4fc071cb96dc7ed1da8f89894ad5c27eaa48c;hp=4c109758eb0e95d8b191d50152866856bbe48b46;hpb=1d05ea78e94897160f978f6103c5f4acf7fb43d3;p=libs%2Fcore.git

diff --git a/source/time/datetime.cpp b/source/time/datetime.cpp
index 4c10975..8623886 100644
--- a/source/time/datetime.cpp
+++ b/source/time/datetime.cpp
@@ -1,18 +1,26 @@
-/* $Id$ */
+/* $Id$
+
+This file is part of libmspcore     
+Copyright © 2006  Mikko Rasa, Mikkosoft Productions
+Distributed under the LGPL
+*/
+
+#include <cstdlib>
 #include <sstream>
 #include <iomanip>
 #include "../core/except.h"
 #include "datetime.h"
 #include "timestamp.h"
+#include "units.h"
 
 using namespace std;
 
 namespace {
 
-inline bool is_leap_year(int32_t y)
+inline bool is_leap_year(int y)
 { return y%4==0 && (y%100 || y%400==0); }
 
-inline uint8_t month_days(int32_t y, uint8_t m)
+inline unsigned char month_days(int y, unsigned char m)
 {
 	switch(m)
 	{
@@ -43,57 +51,35 @@ inline int cmp_(T a, T b)
 namespace Msp {
 namespace Time {
 
-DateTime::DateTime(const TimeStamp &ts):
-	year(1970),
-	month(1),
-	mday(1),
-	hour(0),
-	minute(0),
-	second(0),
-	usec(0)
+DateTime::DateTime(const TimeStamp &ts)
 {
-	add_raw(ts.raw());
+	init(ts);
 }
 
-DateTime::DateTime(int32_t y, uint8_t m, uint8_t d):
-	year(y),
-	month(m),
-	mday(d),
-	hour(0),
-	minute(0),
-	second(0),
-	usec(0)
+DateTime::DateTime(const TimeStamp &ts, const TimeZone &tz)
 {
-	validate();
+	init(ts);
+	convert_timezone(tz);
 }
 
-DateTime::DateTime(int32_t y, uint8_t m, uint8_t d, uint8_t h, uint8_t n, uint8_t s):
-	year(y),
-	month(m),
-	mday(d),
-	hour(h),
-	minute(n),
-	second(s),
-	usec(0)
+DateTime::DateTime(int y, unsigned char m, unsigned char d)
 {
-	validate();
+	init(y, m, d, 0, 0, 0, 0);
 }
 
-DateTime::DateTime(int32_t y, uint8_t m, uint8_t d, uint8_t h, uint8_t n, uint8_t s, uint32_t u):
-	year(y),
-	month(m),
-	mday(d),
-	hour(h),
-	minute(n),
-	second(s),
-	usec(u)
+DateTime::DateTime(int y, unsigned char m, unsigned char d, unsigned char h, unsigned char n, unsigned char s)
 {
-	validate();
+	init(y, m, d, h, n, s, 0);
 }
 
-void DateTime::add_days(int32_t days)
+DateTime::DateTime(int y, unsigned char m, unsigned char d, unsigned char h, unsigned char n, unsigned char s, unsigned u)
 {
-	unsigned new_year=year;
+	init(y, m, d, h, n, s, u);
+}
+
+void DateTime::add_days(int days)
+{
+	int new_year=year;
 
 	/* Leap years have a 400 year cycle, so any 400 consecutive years have a
 	constant number of days (400*365+97=146097) */
@@ -116,6 +102,7 @@ void DateTime::add_days(int32_t days)
 	new_year+=cycles*4;
 
 	// See how many non-leap-years we counted as leap years and reclaim the lost days
+	// XXX This breaks with negative years
 	unsigned missed_leap_days=((year-fudge)%100+cycles*4)/100;
 	if((year-fudge)%400+cycles*4>=400)
 		--missed_leap_days;
@@ -133,8 +120,8 @@ void DateTime::add_days(int32_t days)
 		// We passed a leap year - decrement days
 		if(days==0)
 		{
+			days=is_leap_year(new_year-fudge)?365:364;
 			--new_year;
-			days=is_leap_year(new_year)?365:364;
 		}
 		else
 			--days;
@@ -157,6 +144,17 @@ void DateTime::add_days(int32_t days)
 	mday+=days;
 }
 
+void DateTime::set_timezone(const TimeZone &tz)
+{
+	zone=tz;
+}
+
+void DateTime::convert_timezone(const TimeZone &tz)
+{
+	add_raw((zone.get_offset()-tz.get_offset()).raw());
+	zone=tz;
+}
+
 DateTime DateTime::operator+(const TimeDelta &td) const
 {
 	DateTime dt(*this);
@@ -170,6 +168,19 @@ DateTime &DateTime::operator+=(const TimeDelta &td)
 	return *this;
 }
 
+DateTime DateTime::operator-(const TimeDelta &td) const
+{
+	DateTime dt(*this);
+	dt.add_raw(-td.raw());
+	return dt;
+}
+
+DateTime &DateTime::operator-=(const TimeDelta &td)
+{
+	add_raw(-td.raw());
+	return *this;
+}
+
 int DateTime::cmp(const DateTime &dt) const
 {
 	if(int c=cmp_(year, dt.year))
@@ -192,9 +203,9 @@ int DateTime::cmp(const DateTime &dt) const
 TimeStamp DateTime::get_timestamp() const
 {
 	if(year<-289701 || year>293641)
-		throw Exception("DateTime is not representable as a TimeStamp");
+		throw InvalidState("DateTime is not representable as a TimeStamp");
 
-	int64_t raw=(((hour*60LL)+minute)*60+second)*1000000+usec;
+	RawTime raw=(((hour*60LL)+minute)*60+second)*1000000+usec;
 	int days=(year-1970)*365;
 	days+=(year-1)/4-(year-1)/100+(year-1)/400-477;
 	for(unsigned i=1; i<month; ++i)
@@ -234,7 +245,7 @@ string DateTime::format(const string &fmt) const
 			else if(*i=='y')
 				ss<<setw(2)<<year%100;
 			else if(*i=='Y')
-				ss<<year;
+				ss<<setw(4)<<internal<<year;
 			else if(*i=='%')
 				ss<<'%';
 		}
@@ -245,13 +256,53 @@ string DateTime::format(const string &fmt) const
 	return ss.str();
 }
 
-void DateTime::add_raw(int64_t raw)
+string DateTime::format_rfc3339() const
+{
+	string result=format("%Y-%m-%dT%H:%M:%S");
+	if(const TimeDelta &offs=zone.get_offset())
+	{
+		ostringstream ss;
+		ss.fill('0');
+		int m=abs(static_cast<int>(offs/Time::min));
+		ss<<(offs<zero ? '+' : '-')<<setw(2)<<m/60<<':'<<setw(2)<<m%60;
+		result+=ss.str();
+	}
+	else
+		result+='Z';
+	return result;
+}
+
+void DateTime::init(const TimeStamp &ts)
+{
+	year=1970;
+	month=1;
+	mday=1;
+	hour=0;
+	minute=0;
+	second=0;
+	usec=0;
+	add_raw(ts.raw());
+}
+
+void DateTime::init(int y, unsigned char m, unsigned char d, unsigned char h, unsigned char n, unsigned char s, unsigned u)
+{
+	year=y;
+	month=m;
+	mday=d;
+	hour=h;
+	minute=n;
+	second=s;
+	usec=u;
+	validate();
+}
+
+void DateTime::add_raw(RawTime raw)
 {
-	int32_t days=raw/86400000000LL;
+	int days=static_cast<int>(raw/86400000000LL);
 	raw%=86400000000LL;
 	if(raw<0)
 	{
-		++days;
+		--days;
 		raw+=86400000000LL;
 	}