public DateTime getStartOfDate(LocalDate date) {
// Get the milisecond time for the start of that date in UTC
long utcStartMillis = date.toDateTimeAtStartOfDay(DateTimeZone.UTC).getMillis();
// Lookup the timezone for that time - 12 and +12 hours since timezones range from
// UTC-12h to UTC+12h so the real start time will be within that range
long minStartMillis = utcStartMillis - DateTimeConstants.MILLIS_PER_DAY / 2;
long maxStartMillis = utcStartMillis + DateTimeConstants.MILLIS_PER_DAY / 2;
TimespanSegment<DateTimeZone> minTimespan = this.queryPoint(minStartMillis);
TimespanSegment<DateTimeZone> maxTimespan = this.queryPoint(maxStartMillis);
DateTimeZone realTz = null;
DateTime realDateStart = null;
// Check if they agree
if (minTimespan == maxTimespan) {
// Ok, they agree so we're good, just use the consensus timezone
realTz = minTimespan.getValue();
realDateStart = date.toDateTimeAtStartOfDay(realTz);
} else {
// The start and end timespans are different, compute the start time in each and see which if
// either intersect
DateTime minTzStartDT = date.toDateTimeAtStartOfDay(minTimespan.getValue());
DateTime maxTzStartDT = date.toDateTimeAtStartOfDay(maxTimespan.getValue());
// Does the earlier one fall within the timespan for the minTimezone
long minTzStartMillis = minTzStartDT.getMillis();
long maxTzStartMillis = maxTzStartDT.getMillis();
if (minTimespan.isTimeInSpan(minTzStartMillis)) {
// First one works, keep it
realTz = minTimespan.getValue();
realDateStart = minTzStartDT;
} else if (maxTimespan.isTimeInSpan(maxStartMillis)) {
// Last one works, keep it
realTz = maxTimespan.getValue();
realDateStart = maxTzStartDT;
} else {
// Something weird is going on here, complain and return GMT
System.out.println(
"Cant figure out start of date "
+ date.toString()
+ ", "
+ minTimespan
+ " does not contain "
+ minTzStartDT
+ " and "
+ maxTimespan
+ " does not contain "
+ maxTzStartDT);
return (date.toDateTimeAtStartOfDay(DateTimeZone.UTC));
}
}
// System.out.println("Start of date "+date.toString()+", in "+realTz + ": " + realDateStart);
return (realDateStart);
}
public DateTimeZone getMainTimezone() {
Map<DateTimeZone, Long> timespentInTimezoneMap = new HashMap<DateTimeZone, Long>();
for (TimespanSegment<DateTimeZone> span : spans) {
long timeSpent = span.getEnd() - span.getStart();
if (timespentInTimezoneMap.containsKey(span.getValue())) {
final Long timeAlreadySpent = timespentInTimezoneMap.get(span.getValue());
timespentInTimezoneMap.put(span.getValue(), timeAlreadySpent + timeSpent);
} else {
timespentInTimezoneMap.put(span.getValue(), timeSpent);
}
}
long maxTimespent = Long.MIN_VALUE;
DateTimeZone mainTimezone = null;
for (DateTimeZone dateTimeZone : timespentInTimezoneMap.keySet()) {
if (timespentInTimezoneMap.get(dateTimeZone) > maxTimespent) {
maxTimespent = timespentInTimezoneMap.get(dateTimeZone);
mainTimezone = dateTimeZone;
}
}
return mainTimezone;
}
