Hendrik Lipka / TimeZone

This library takes the current time (which must be set to UTC, e.g. via an NTP call), and applies a timezone definition (loaded at startup) to calculate the local time. This includes the handling of daylight saving. See http://mbed.org/users/hlipka/notebook/time-zone-handling/ for more information (esp. how to get a time zone definition file).

Dependents:   CubiScan 000-FIN_youcef 005_ESSAI_youcef

Time.cpp@3:2ad51ec5ef6e, 2011-01-04 (annotated)

Committer:
hlipka
Date:
Tue Jan 04 23:19:50 2011 +0000
Revision:
3:2ad51ec5ef6e
Parent:
0:ab93db24fcc8
Child:
4:c84afcfbac84
fixed reading of time zone entries (was missing the beginning of the year), months are starting with 1 now, updated documentation

Who changed what in which revision?

UserRevisionLine numberNew contents of line
hlipka 0:ab93db24fcc8 1 #include "Time.h"
hlipka 0:ab93db24fcc8 2
hlipka 0:ab93db24fcc8 3 #include "stdio.h"
hlipka 0:ab93db24fcc8 4 #include "time.h"
hlipka 0:ab93db24fcc8 5
hlipka 0:ab93db24fcc8 6 using namespace std;
hlipka 0:ab93db24fcc8 7
hlipka 0:ab93db24fcc8 8 class TimeZoneEntry {
hlipka 0:ab93db24fcc8 9 public:
hlipka 0:ab93db24fcc8 10 TimeStamp *_from;
hlipka 0:ab93db24fcc8 11 TimeStamp *_to;
hlipka 0:ab93db24fcc8 12 int _offset;
hlipka 0:ab93db24fcc8 13 };
hlipka 0:ab93db24fcc8 14
hlipka 0:ab93db24fcc8 15 list<TimeZoneEntry*> *Time::_timeZoneEntries=NULL;
hlipka 0:ab93db24fcc8 16
hlipka 0:ab93db24fcc8 17 bool TimeStamp::isSame(TimeStamp* ts)
hlipka 0:ab93db24fcc8 18 {
hlipka 0:ab93db24fcc8 19 if (ts->getYear()!=getYear())
hlipka 0:ab93db24fcc8 20 return false;
hlipka 0:ab93db24fcc8 21 if (ts->getMonth()!=getMonth())
hlipka 0:ab93db24fcc8 22 return false;
hlipka 0:ab93db24fcc8 23 if (ts->getDay()!=getDay())
hlipka 0:ab93db24fcc8 24 return false;
hlipka 0:ab93db24fcc8 25 if (ts->getHour()!=getHour())
hlipka 0:ab93db24fcc8 26 return false;
hlipka 0:ab93db24fcc8 27 if (ts->getSecond()!=getSecond())
hlipka 0:ab93db24fcc8 28 return false;
hlipka 0:ab93db24fcc8 29 return true;
hlipka 0:ab93db24fcc8 30 }
hlipka 0:ab93db24fcc8 31 bool TimeStamp::isBefore(TimeStamp* ts)
hlipka 0:ab93db24fcc8 32 {
hlipka 0:ab93db24fcc8 33 if (getYear()<ts->getYear())
hlipka 0:ab93db24fcc8 34 return true;
hlipka 0:ab93db24fcc8 35 if (getYear()>ts->getYear())
hlipka 0:ab93db24fcc8 36 return false;
hlipka 0:ab93db24fcc8 37
hlipka 0:ab93db24fcc8 38 if (getMonth()<ts->getMonth())
hlipka 0:ab93db24fcc8 39 return true;
hlipka 0:ab93db24fcc8 40 if (getMonth()>ts->getMonth())
hlipka 0:ab93db24fcc8 41 return false;
hlipka 0:ab93db24fcc8 42
hlipka 0:ab93db24fcc8 43 if (getDay()<ts->getDay())
hlipka 0:ab93db24fcc8 44 return true;
hlipka 0:ab93db24fcc8 45 if (getDay()>ts->getDay())
hlipka 0:ab93db24fcc8 46 return false;
hlipka 0:ab93db24fcc8 47
hlipka 0:ab93db24fcc8 48 if (getHour()<ts->getHour())
hlipka 0:ab93db24fcc8 49 return true;
hlipka 0:ab93db24fcc8 50 if (getHour()>ts->getHour())
hlipka 0:ab93db24fcc8 51 return false;
hlipka 0:ab93db24fcc8 52
hlipka 0:ab93db24fcc8 53 if (getSecond()<ts->getSecond())
hlipka 0:ab93db24fcc8 54 return true;
hlipka 0:ab93db24fcc8 55 return false;
hlipka 0:ab93db24fcc8 56 }
hlipka 0:ab93db24fcc8 57 bool TimeStamp::isAfter(TimeStamp* ts)
hlipka 0:ab93db24fcc8 58 {
hlipka 0:ab93db24fcc8 59 return ts->isBefore(this);
hlipka 0:ab93db24fcc8 60 }
hlipka 0:ab93db24fcc8 61
hlipka 0:ab93db24fcc8 62 Time::Time() {
hlipka 0:ab93db24fcc8 63 if (NULL==Time::_timeZoneEntries) {
hlipka 0:ab93db24fcc8 64 _timeZoneEntries=new list<TimeZoneEntry*>();
hlipka 0:ab93db24fcc8 65 readTimeZones();
hlipka 0:ab93db24fcc8 66 }
hlipka 0:ab93db24fcc8 67 }
hlipka 0:ab93db24fcc8 68
hlipka 0:ab93db24fcc8 69 void Time::readTimeZones() {
hlipka 0:ab93db24fcc8 70 time_t rawtime;
hlipka 0:ab93db24fcc8 71 time ( &rawtime );
hlipka 0:ab93db24fcc8 72 TimeStamp ts(rawtime);
hlipka 0:ab93db24fcc8 73
hlipka 0:ab93db24fcc8 74 int currentYear=ts.getYear();
hlipka 0:ab93db24fcc8 75
hlipka 0:ab93db24fcc8 76 FILE *fp = fopen("/local/timezone.csv", "r");
hlipka 0:ab93db24fcc8 77
hlipka 0:ab93db24fcc8 78 if (fp==NULL) {
hlipka 0:ab93db24fcc8 79 printf("error while reading timezone file [timezone.csv]\n");
hlipka 0:ab93db24fcc8 80 return;
hlipka 0:ab93db24fcc8 81 }
hlipka 0:ab93db24fcc8 82
hlipka 0:ab93db24fcc8 83
hlipka 0:ab93db24fcc8 84 char tmp[128]; // enough for a single line
hlipka 0:ab93db24fcc8 85 while (fgets(tmp,sizeof(tmp),fp)!=0) {
hlipka 0:ab93db24fcc8 86 int fyear, fmon, fday, fhour, fmin, fsec;
hlipka 0:ab93db24fcc8 87 int tyear, tmon, tday, thour, tmin, tsec;
hlipka 0:ab93db24fcc8 88 int offset;
hlipka 0:ab93db24fcc8 89 int r=sscanf(tmp,"%4d-%2d-%2dT%2d:%2d:%2dZ,%4d-%2d-%2dT%2d:%2d:%2dZ,%d",
hlipka 0:ab93db24fcc8 90 &fyear, &fmon, &fday, &fhour, &fmin, &fsec,
hlipka 0:ab93db24fcc8 91 &tyear, &tmon, &tday, &thour, &tmin, &tsec,
hlipka 0:ab93db24fcc8 92 &offset
hlipka 0:ab93db24fcc8 93 );
hlipka 0:ab93db24fcc8 94 if (13!=r)
hlipka 0:ab93db24fcc8 95 continue;
hlipka 3:2ad51ec5ef6e 96 if (tyear<currentYear || fyear>currentYear+4)
hlipka 0:ab93db24fcc8 97 continue;
hlipka 0:ab93db24fcc8 98
hlipka 0:ab93db24fcc8 99 TimeStamp *from=new TimeStamp(fyear, fmon, fday, fhour, fmin, fsec);
hlipka 0:ab93db24fcc8 100 TimeStamp *to=new TimeStamp(tyear, tmon, tday, thour, tmin, tsec);
hlipka 0:ab93db24fcc8 101 TimeZoneEntry *tze=new TimeZoneEntry();
hlipka 0:ab93db24fcc8 102 tze->_from=from;
hlipka 0:ab93db24fcc8 103 tze->_to=to;
hlipka 0:ab93db24fcc8 104 tze->_offset=offset;
hlipka 0:ab93db24fcc8 105 _timeZoneEntries->push_back(tze);
hlipka 0:ab93db24fcc8 106 }
hlipka 0:ab93db24fcc8 107
hlipka 0:ab93db24fcc8 108 fclose(fp);
hlipka 0:ab93db24fcc8 109 }
hlipka 0:ab93db24fcc8 110
hlipka 0:ab93db24fcc8 111 Time::~Time() {
hlipka 0:ab93db24fcc8 112 }
hlipka 0:ab93db24fcc8 113
hlipka 0:ab93db24fcc8 114 TimeStamp* Time::getTime() {
hlipka 0:ab93db24fcc8 115 time_t rawtime;
hlipka 0:ab93db24fcc8 116 time ( &rawtime );
hlipka 0:ab93db24fcc8 117 TimeStamp *ts=new TimeStamp(rawtime);
hlipka 3:2ad51ec5ef6e 118
hlipka 0:ab93db24fcc8 119 for (list<TimeZoneEntry*>::iterator it = _timeZoneEntries->begin(); it != _timeZoneEntries->end(); it++) {
hlipka 0:ab93db24fcc8 120 TimeZoneEntry* tze=*it;
hlipka 0:ab93db24fcc8 121 if (tze->_from->isBefore(ts) && tze->_to->isAfter(ts))
hlipka 0:ab93db24fcc8 122 {
hlipka 0:ab93db24fcc8 123 rawtime+=tze->_offset;
hlipka 0:ab93db24fcc8 124 ts->updateTime(rawtime);
hlipka 3:2ad51ec5ef6e 125 break;
hlipka 0:ab93db24fcc8 126 }
hlipka 0:ab93db24fcc8 127 }
hlipka 0:ab93db24fcc8 128
hlipka 0:ab93db24fcc8 129 return ts;
hlipka 0:ab93db24fcc8 130 }