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@4:c84afcfbac84, 2011-01-21 (annotated)

Committer:
hlipka
Date:
Fri Jan 21 23:05:05 2011 +0000
Revision:
4:c84afcfbac84
Parent:
3:2ad51ec5ef6e
Child:
5:fde01b92a384
reduced memory consumption (using packed data structures and a linked list instead of std::list), and added an asChar() method for easier printf()ing

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 4:c84afcfbac84 13 TimeZoneEntry* next;
hlipka 0:ab93db24fcc8 14 };
hlipka 0:ab93db24fcc8 15
hlipka 4:c84afcfbac84 16 TimeZoneEntry* Time::_timeZoneEntries=NULL;
hlipka 0:ab93db24fcc8 17
hlipka 0:ab93db24fcc8 18 bool TimeStamp::isSame(TimeStamp* ts)
hlipka 0:ab93db24fcc8 19 {
hlipka 0:ab93db24fcc8 20 if (ts->getYear()!=getYear())
hlipka 0:ab93db24fcc8 21 return false;
hlipka 0:ab93db24fcc8 22 if (ts->getMonth()!=getMonth())
hlipka 0:ab93db24fcc8 23 return false;
hlipka 0:ab93db24fcc8 24 if (ts->getDay()!=getDay())
hlipka 0:ab93db24fcc8 25 return false;
hlipka 0:ab93db24fcc8 26 if (ts->getHour()!=getHour())
hlipka 0:ab93db24fcc8 27 return false;
hlipka 0:ab93db24fcc8 28 if (ts->getSecond()!=getSecond())
hlipka 0:ab93db24fcc8 29 return false;
hlipka 0:ab93db24fcc8 30 return true;
hlipka 0:ab93db24fcc8 31 }
hlipka 0:ab93db24fcc8 32 bool TimeStamp::isBefore(TimeStamp* ts)
hlipka 0:ab93db24fcc8 33 {
hlipka 0:ab93db24fcc8 34 if (getYear()<ts->getYear())
hlipka 0:ab93db24fcc8 35 return true;
hlipka 0:ab93db24fcc8 36 if (getYear()>ts->getYear())
hlipka 0:ab93db24fcc8 37 return false;
hlipka 0:ab93db24fcc8 38
hlipka 0:ab93db24fcc8 39 if (getMonth()<ts->getMonth())
hlipka 0:ab93db24fcc8 40 return true;
hlipka 0:ab93db24fcc8 41 if (getMonth()>ts->getMonth())
hlipka 0:ab93db24fcc8 42 return false;
hlipka 0:ab93db24fcc8 43
hlipka 0:ab93db24fcc8 44 if (getDay()<ts->getDay())
hlipka 0:ab93db24fcc8 45 return true;
hlipka 0:ab93db24fcc8 46 if (getDay()>ts->getDay())
hlipka 0:ab93db24fcc8 47 return false;
hlipka 0:ab93db24fcc8 48
hlipka 0:ab93db24fcc8 49 if (getHour()<ts->getHour())
hlipka 0:ab93db24fcc8 50 return true;
hlipka 0:ab93db24fcc8 51 if (getHour()>ts->getHour())
hlipka 0:ab93db24fcc8 52 return false;
hlipka 0:ab93db24fcc8 53
hlipka 0:ab93db24fcc8 54 if (getSecond()<ts->getSecond())
hlipka 0:ab93db24fcc8 55 return true;
hlipka 0:ab93db24fcc8 56 return false;
hlipka 0:ab93db24fcc8 57 }
hlipka 0:ab93db24fcc8 58 bool TimeStamp::isAfter(TimeStamp* ts)
hlipka 0:ab93db24fcc8 59 {
hlipka 0:ab93db24fcc8 60 return ts->isBefore(this);
hlipka 0:ab93db24fcc8 61 }
hlipka 0:ab93db24fcc8 62
hlipka 0:ab93db24fcc8 63 Time::Time() {
hlipka 4:c84afcfbac84 64 // printf("init time\n");
hlipka 0:ab93db24fcc8 65 if (NULL==Time::_timeZoneEntries) {
hlipka 4:c84afcfbac84 66 // printf("reading time zones\n");
hlipka 0:ab93db24fcc8 67 readTimeZones();
hlipka 0:ab93db24fcc8 68 }
hlipka 0:ab93db24fcc8 69 }
hlipka 0:ab93db24fcc8 70
hlipka 0:ab93db24fcc8 71 void Time::readTimeZones() {
hlipka 0:ab93db24fcc8 72 time_t rawtime;
hlipka 0:ab93db24fcc8 73 time ( &rawtime );
hlipka 4:c84afcfbac84 74 TimeStamp *ts=new TimeStamp(rawtime);
hlipka 0:ab93db24fcc8 75
hlipka 4:c84afcfbac84 76 int currentYear=ts->getYear();
hlipka 4:c84afcfbac84 77 delete ts;
hlipka 0:ab93db24fcc8 78
hlipka 0:ab93db24fcc8 79 FILE *fp = fopen("/local/timezone.csv", "r");
hlipka 0:ab93db24fcc8 80
hlipka 0:ab93db24fcc8 81 if (fp==NULL) {
hlipka 0:ab93db24fcc8 82 printf("error while reading timezone file [timezone.csv]\n");
hlipka 0:ab93db24fcc8 83 return;
hlipka 0:ab93db24fcc8 84 }
hlipka 4:c84afcfbac84 85
hlipka 4:c84afcfbac84 86 TimeZoneEntry *current=NULL;
hlipka 0:ab93db24fcc8 87
hlipka 0:ab93db24fcc8 88
hlipka 0:ab93db24fcc8 89 char tmp[128]; // enough for a single line
hlipka 0:ab93db24fcc8 90 while (fgets(tmp,sizeof(tmp),fp)!=0) {
hlipka 0:ab93db24fcc8 91 int fyear, fmon, fday, fhour, fmin, fsec;
hlipka 0:ab93db24fcc8 92 int tyear, tmon, tday, thour, tmin, tsec;
hlipka 0:ab93db24fcc8 93 int offset;
hlipka 0:ab93db24fcc8 94 int r=sscanf(tmp,"%4d-%2d-%2dT%2d:%2d:%2dZ,%4d-%2d-%2dT%2d:%2d:%2dZ,%d",
hlipka 0:ab93db24fcc8 95 &fyear, &fmon, &fday, &fhour, &fmin, &fsec,
hlipka 0:ab93db24fcc8 96 &tyear, &tmon, &tday, &thour, &tmin, &tsec,
hlipka 0:ab93db24fcc8 97 &offset
hlipka 0:ab93db24fcc8 98 );
hlipka 0:ab93db24fcc8 99 if (13!=r)
hlipka 0:ab93db24fcc8 100 continue;
hlipka 3:2ad51ec5ef6e 101 if (tyear<currentYear || fyear>currentYear+4)
hlipka 0:ab93db24fcc8 102 continue;
hlipka 4:c84afcfbac84 103
hlipka 4:c84afcfbac84 104 TimeStamp *from=new TimeStamp(fyear, fmon, fday, fhour, fmin, fsec,0);
hlipka 4:c84afcfbac84 105 TimeStamp *to=new TimeStamp(tyear, tmon, tday, thour, tmin, tsec,0);
hlipka 0:ab93db24fcc8 106 TimeZoneEntry *tze=new TimeZoneEntry();
hlipka 0:ab93db24fcc8 107 tze->_from=from;
hlipka 0:ab93db24fcc8 108 tze->_to=to;
hlipka 0:ab93db24fcc8 109 tze->_offset=offset;
hlipka 4:c84afcfbac84 110 tze->next=NULL;
hlipka 4:c84afcfbac84 111
hlipka 4:c84afcfbac84 112 if (NULL==current)
hlipka 4:c84afcfbac84 113 {
hlipka 4:c84afcfbac84 114 current=tze;
hlipka 4:c84afcfbac84 115 _timeZoneEntries=tze;
hlipka 4:c84afcfbac84 116 }
hlipka 4:c84afcfbac84 117 else
hlipka 4:c84afcfbac84 118 {
hlipka 4:c84afcfbac84 119 current->next=tze;
hlipka 4:c84afcfbac84 120 current=tze;
hlipka 4:c84afcfbac84 121 }
hlipka 0:ab93db24fcc8 122 }
hlipka 4:c84afcfbac84 123 printf("closing time zone file\n");
hlipka 0:ab93db24fcc8 124 fclose(fp);
hlipka 0:ab93db24fcc8 125 }
hlipka 0:ab93db24fcc8 126
hlipka 0:ab93db24fcc8 127 Time::~Time() {
hlipka 0:ab93db24fcc8 128 }
hlipka 0:ab93db24fcc8 129
hlipka 0:ab93db24fcc8 130 TimeStamp* Time::getTime() {
hlipka 0:ab93db24fcc8 131 time_t rawtime;
hlipka 0:ab93db24fcc8 132 time ( &rawtime );
hlipka 0:ab93db24fcc8 133 TimeStamp *ts=new TimeStamp(rawtime);
hlipka 3:2ad51ec5ef6e 134
hlipka 4:c84afcfbac84 135 TimeZoneEntry *current=_timeZoneEntries;
hlipka 4:c84afcfbac84 136
hlipka 4:c84afcfbac84 137 while (current!=NULL)
hlipka 4:c84afcfbac84 138 {
hlipka 4:c84afcfbac84 139 if (current->_from->isBefore(ts) && current->_to->isAfter(ts))
hlipka 0:ab93db24fcc8 140 {
hlipka 4:c84afcfbac84 141 rawtime+=current->_offset;
hlipka 0:ab93db24fcc8 142 ts->updateTime(rawtime);
hlipka 3:2ad51ec5ef6e 143 break;
hlipka 0:ab93db24fcc8 144 }
hlipka 4:c84afcfbac84 145 current=current->next;
hlipka 0:ab93db24fcc8 146 }
hlipka 0:ab93db24fcc8 147
hlipka 0:ab93db24fcc8 148 return ts;
hlipka 0:ab93db24fcc8 149 }