thank you for your opinion. On 8월25일, 오후5시40분, Kostya Vasilyev <kmans...@gmail.com> wrote: > The time here (at least in this piece of code) comes from calling > "time(NULL)", which is really no better than calling new Date().getTime(). > > You are also confusing local time and time set by the user. Local time > is UTC time corrected by the local timezone. Java uses UTC time for > internal representation, is not affected by timezone changes, and > shouldn't give you any trouble. > > On the other hand, the user is free to change time to any value > whatsoever, even an incorrect one. The time zone setting can be wrong, too. > > If you really need time information that's device- (and user-) > independent, you'll need to get it from some place that's not controlled > by the user and can be counted on for being there. > > Like an NTP server. > > http://www.pool.ntp.org/en/ > > -- Kostya > > 25.08.2010 12:11, optimusgeek пишет: > > > > > > > I need to get pure UTC time in application level. > > It should not be changed by user or location or anything else. > > When I try with System.currentTimeMillis() or getTime() of Date class, > > they always return value of local time. If user change date or time, > > the return value is also changed. > > I found handleEndOfInit method in android_modem.c (external\qemu > > \telephony) > > and the method is like below. > > Probably, the variable "utc" is what I want. > > > 1. Is the android_modem.c for emulator?? > > 2. If it is, I think there must be similar file for target. Where is > > it? > > 3. How can I get the "utc" value in my application? > > > static const char* > > handleEndOfInit( const char* cmd, AModem modem ) > > { > > time_t now = time(NULL); > > struct tm utc, local; > > long e_local, e_utc; > > long tzdiff; > > char tzname[64]; > > > tzset(); > > > utc = *gmtime(&now ); > > local = *localtime(&now ); > > > e_local = local.tm_min + 60*(local.tm_hour + 24*local.tm_yday); > > e_utc = utc.tm_min + 60*(utc.tm_hour + 24*utc.tm_yday); > > > if ( utc.tm_year< local.tm_year ) > > e_local += 24*60; > > else if ( utc.tm_year> local.tm_year ) > > e_utc += 24*60; > > > tzdiff = e_local - e_utc; /* timezone offset in minutes */ > > > /* retrieve a zoneinfo-compatible name for the host timezone > > */ > > { > > char* end = tzname + sizeof(tzname); > > char* p = bufprint_zoneinfo_timezone( tzname, end ); > > if (p>= end) > > strcpy(tzname, "Unknown/Unknown"); > > > /* now replace every / in the timezone name by a "!" > > * that's because the code that reads the CTZV line is > > * dumb and treats a / as a field separator... > > */ > > p = tzname; > > while (1) { > > p = strchr(p, '/'); > > if (p == NULL) > > break; > > *p = '!'; > > p += 1; > > } > > } > > > /* as a special extension, we append the name of the host's time > > zone to the > > * string returned with %CTZ. the system should contain special > > code to detect > > * and deal with this case (since it normally relied on the > > operator's country code > > * which is hard to simulate on a general-purpose computer > > */ > > return amodem_printf( modem, "%%CTZV: %02d/%02d/%02d:%02d:%02d:%02d > > %c%d:%d:%s", > > (utc.tm_year + 1900) % 100, utc.tm_mon + 1, utc.tm_mday, > > utc.tm_hour, utc.tm_min, utc.tm_sec, > > (tzdiff>= 0) ? '+' : '-', (tzdiff>= 0 ? tzdiff : - > > tzdiff) / 15, > > (local.tm_isdst> 0), > > tzname ); > > } > > -- > Kostya Vasilev -- WiFi Manager + pretty widget > --http://kmansoft.wordpress.com- 원본 텍스트 숨기기 - > > - 원본 텍스트 보기 -
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