// for this granularity.
var g = spacing / 1000;
var d = new Date(start_time);
- d.setMilliseconds(0);
+ Dygraph.setDateSameTZ(d, {ms: 0});
+
var x;
if (g <= 60) { // seconds
- x = d.getSeconds(); d.setSeconds(x - x % g);
+ x = d.getSeconds();
+ Dygraph.setDateSameTZ(d, {s: x - x % g});
} else {
- d.setSeconds(0);
+ Dygraph.setDateSameTZ(d, {s: 0});
g /= 60;
if (g <= 60) { // minutes
- x = d.getMinutes(); d.setMinutes(x - x % g);
+ x = d.getMinutes();
+ Dygraph.setDateSameTZ(d, {m: x - x % g});
} else {
- d.setMinutes(0);
+ Dygraph.setDateSameTZ(d, {m: 0});
g /= 60;
if (g <= 24) { // days
- x = d.getHours(); d.setHours(x - x % g);
+ x = d.getHours();
+ d.setHours(x - x % g);
} else {
d.setHours(0);
g /= 24;
}
start_time = d.getTime();
+ // For spacings coarser than two-hourly, we want to ignore daylight
+ // savings transitions to get consistent ticks. For finer-grained ticks,
+ // it's essential to show the DST transition in all its messiness.
var start_offset_min = new Date(start_time).getTimezoneOffset();
+ var check_dst = (spacing >= Dygraph.SHORT_SPACINGS[Dygraph.TWO_HOURLY]);
+
for (t = start_time; t <= end_time; t += spacing) {
var d = new Date(t);
// This ensures that we stay on the same hourly "rhythm" across
// daylight savings transitions. Without this, the ticks could get off
// by an hour. See tests/daylight-savings.html or issue 147.
- if (d.getTimezoneOffset() != start_offset_min) {
- t += (d.getTimezoneOffset() - start_offset_min) * 60 * 1000;
+ if (check_dst && d.getTimezoneOffset() != start_offset_min) {
+ var delta_min = d.getTimezoneOffset() - start_offset_min;
+ t += delta_min * 60 * 1000;
d = new Date(t);
start_offset_min = d.getTimezoneOffset();
+
+ // Check whether we've backed into the previous timezone again.
+ // This can happen during a "spring forward" transition. In this case,
+ // it's best to skip this tick altogether (we may be shooting for a
+ // non-existent time like the 2AM that's skipped) and go to the next
+ // one.
+ if (new Date(t + spacing).getTimezoneOffset() != start_offset_min) {
+ t += spacing;
+ d = new Date(t);
+ start_offset_min = d.getTimezoneOffset();
+ }
}
ticks.push({ v:t,
// These are set here so that this file can be included after dygraph.js
// or independently.
-Dygraph.DEFAULT_ATTRS = Dygraph.DEFAULT_ATTRS || {};
-Dygraph.DEFAULT_ATTRS['axes'] = Dygraph.DEFAULT_ATTRS['axes'] || {};
-Dygraph.DEFAULT_ATTRS['axes']['x'] = Dygraph.DEFAULT_ATTRS['axes']['x'] || {};
-Dygraph.DEFAULT_ATTRS['axes']['y'] = Dygraph.DEFAULT_ATTRS['axes']['y'] || {};
-Dygraph.DEFAULT_ATTRS['axes']['y2'] = Dygraph.DEFAULT_ATTRS['axes']['y2'] || {};
-Dygraph.DEFAULT_ATTRS['axes']['x']['ticker'] = Dygraph.dateTicker;
-Dygraph.DEFAULT_ATTRS['axes']['y']['ticker'] = Dygraph.numericTicks;
-Dygraph.DEFAULT_ATTRS['axes']['y2']['ticker'] = Dygraph.numericTicks;
+if (Dygraph &&
+ Dygraph.DEFAULT_ATTRS &&
+ Dygraph.DEFAULT_ATTRS['axes'] &&
+ Dygraph.DEFAULT_ATTRS['axes']['x'] &&
+ Dygraph.DEFAULT_ATTRS['axes']['y'] &&
+ Dygraph.DEFAULT_ATTRS['axes']['y2']) {
+ Dygraph.DEFAULT_ATTRS['axes']['x']['ticker'] = Dygraph.dateTicker;
+ Dygraph.DEFAULT_ATTRS['axes']['y']['ticker'] = Dygraph.numericTicks;
+ Dygraph.DEFAULT_ATTRS['axes']['y2']['ticker'] = Dygraph.numericTicks;
+}