Bug 1494160 - Modify timezone update script so that zones.json can contain recent and future rules; r=Fallen

This commit is contained in:
Geoff Lankow 2019-05-20 15:53:09 +12:00
Родитель 0b95f178ee
Коммит 2308ad78d9
5 изменённых файлов: 317 добавлений и 70 удалений

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@ -480,3 +480,6 @@ pref.timezone.Asia.Atyrau=Asia/Atyrau
#added with 2.2017b
pref.timezone.America.Punta_Arenas=America/Punta Arenas
#added with 2.2018i
pref.timezone.Asia.Qostanay=Asia/Qostanay

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@ -0,0 +1,117 @@
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
const FEBRUARY = 1;
const OCTOBER = 9;
const NOVEMBER = 10;
const UTC_MINUS_3 = -3 * 3600;
const UTC_MINUS_2 = -2 * 3600;
function run_test() {
do_calendar_startup(run_next_test);
}
// This test requires timezone data going back to 2016. It's been kept here as an example.
/* add_test(function testCaracas() {
let time = cal.createDateTime();
let zone = cal.getTimezoneService().getTimezone("America/Caracas");
for (let month = JANUARY; month <= DECEMBER; month++) {
time.resetTo(2015, month, 1, 0, 0, 0, zone);
equal(time.timezoneOffset, UTC_MINUS_430, time.toString());
}
for (let month = JANUARY; month <= APRIL; month++) {
time.resetTo(2016, month, 1, 0, 0, 0, zone);
equal(time.timezoneOffset, UTC_MINUS_430, time.toString());
}
time.resetTo(2016, MAY, 1, 1, 0, 0, zone);
equal(time.timezoneOffset, UTC_MINUS_430, time.toString());
time.resetTo(2016, MAY, 1, 3, 0, 0, zone);
equal(time.timezoneOffset, UTC_MINUS_4, time.toString());
for (let month = JUNE; month <= DECEMBER; month++) {
time.resetTo(2016, month, 1, 0, 0, 0, zone);
equal(time.timezoneOffset, UTC_MINUS_4, time.toString());
}
for (let month = JANUARY; month <= DECEMBER; month++) {
time.resetTo(2017, month, 1, 0, 0, 0, zone);
equal(time.timezoneOffset, UTC_MINUS_4, time.toString());
}
run_next_test();
}); */
// Brazil's rules are complicated. This tests every change in the time range we have data for.
add_test(function testSaoPaulo() {
let time = cal.createDateTime();
let zone = cal.getTimezoneService().getTimezone("America/Sao_Paulo");
time.resetTo(2018, FEBRUARY, 17, 0, 0, 0, zone);
equal(time.timezoneOffset, UTC_MINUS_2, time.toString());
time.resetTo(2018, FEBRUARY, 18, 0, 0, 0, zone);
equal(time.timezoneOffset, UTC_MINUS_3, time.toString());
time.resetTo(2018, NOVEMBER, 3, 0, 0, 0, zone);
equal(time.timezoneOffset, UTC_MINUS_3, time.toString());
time.resetTo(2018, NOVEMBER, 4, 0, 0, 0, zone);
equal(time.timezoneOffset, UTC_MINUS_2, time.toString());
time.resetTo(2019, FEBRUARY, 16, 0, 0, 0, zone);
equal(time.timezoneOffset, UTC_MINUS_2, time.toString());
time.resetTo(2019, FEBRUARY, 17, 0, 0, 0, zone);
equal(time.timezoneOffset, UTC_MINUS_3, time.toString());
time.resetTo(2019, NOVEMBER, 2, 0, 0, 0, zone);
equal(time.timezoneOffset, UTC_MINUS_3, time.toString());
time.resetTo(2019, NOVEMBER, 3, 0, 0, 0, zone);
equal(time.timezoneOffset, UTC_MINUS_2, time.toString());
time.resetTo(2020, FEBRUARY, 15, 0, 0, 0, zone);
equal(time.timezoneOffset, UTC_MINUS_2, time.toString());
time.resetTo(2020, FEBRUARY, 16, 0, 0, 0, zone);
equal(time.timezoneOffset, UTC_MINUS_3, time.toString());
time.resetTo(2020, OCTOBER, 31, 0, 0, 0, zone);
equal(time.timezoneOffset, UTC_MINUS_3, time.toString());
time.resetTo(2020, NOVEMBER, 1, 0, 0, 0, zone);
equal(time.timezoneOffset, UTC_MINUS_2, time.toString());
time.resetTo(2021, FEBRUARY, 20, 0, 0, 0, zone);
equal(time.timezoneOffset, UTC_MINUS_2, time.toString());
time.resetTo(2021, FEBRUARY, 21, 0, 0, 0, zone);
equal(time.timezoneOffset, UTC_MINUS_3, time.toString());
time.resetTo(2021, NOVEMBER, 6, 0, 0, 0, zone);
equal(time.timezoneOffset, UTC_MINUS_3, time.toString());
time.resetTo(2021, NOVEMBER, 7, 0, 0, 0, zone);
equal(time.timezoneOffset, UTC_MINUS_2, time.toString());
time.resetTo(2022, FEBRUARY, 19, 0, 0, 0, zone);
equal(time.timezoneOffset, UTC_MINUS_2, time.toString());
time.resetTo(2022, FEBRUARY, 20, 0, 0, 0, zone);
equal(time.timezoneOffset, UTC_MINUS_3, time.toString());
time.resetTo(2022, NOVEMBER, 5, 0, 0, 0, zone);
equal(time.timezoneOffset, UTC_MINUS_3, time.toString());
time.resetTo(2022, NOVEMBER, 6, 0, 0, 0, zone);
equal(time.timezoneOffset, UTC_MINUS_2, time.toString());
run_next_test();
});

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@ -49,6 +49,7 @@ skip-if = true # See bug 1481180. requesttimeoutfactor = 2
[test_startup_service.js]
[test_storage.js]
[test_timezone.js]
[test_timezone_changes.js]
[test_timezone_definition.js]
[test_unifinder_utils.js]
[test_utils.js]

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@ -15,15 +15,22 @@ Otherwise manual corrections will get dropped when pushing the update.
"""
from __future__ import absolute_import
import argparse, ftplib, json, os, os.path, re, shutil, subprocess, sys, tarfile, tempfile
from collections import OrderedDict
from datetime import date, timedelta
# Keep timezone changes from this date onwards. If the zones.json file is becoming
# too large, consider changing to a later date.
HISTORY_CUTOFF = 20180101
FUTURE_CUTOFF = 20221231
class TimezoneUpdater(object):
""" Timezone updater class, use the run method to do everything automatically"""
def __init__(self, tzdata_path, zoneinfo_path, zoneinfo_pure_path):
def __init__(self, tzdata_path, zoneinfo_pure_path):
self.tzdata_path = tzdata_path
self.zoneinfo_path = zoneinfo_path
self.zoneinfo_pure_path = zoneinfo_pure_path
def download_tzdata(self):
@ -55,14 +62,7 @@ class TimezoneUpdater(object):
def run_vzic(self, vzic_path):
"""Use vzic to create ICS versions of the data."""
# Use `vzic` to create 'pure' and 'non-pure' zone files.
sys.stderr.write("Exporting zone info to %s\n" % self.zoneinfo_path)
subprocess.check_call([
vzic_path,
"--olson-dir", self.tzdata_path,
"--output-dir", self.zoneinfo_path
], stdout=sys.stderr)
# Use `vzic` to create zone files.
sys.stderr.write("Exporting pure zone info to %s\n" % self.zoneinfo_pure_path)
subprocess.check_call([
vzic_path,
@ -85,7 +85,7 @@ class TimezoneUpdater(object):
def read_zones_tab(self):
"""Read zones.tab for latitude and longitude data."""
lat_long_data = {}
with open(os.path.join(self.zoneinfo_path, "zones.tab"), "r") as tab:
with open(os.path.join(self.zoneinfo_pure_path, "zones.tab"), "r") as tab:
for line in tab:
if len(line) < 19:
sys.stderr.write("Line in zones.tab not long enough: %s\n" % line.strip())
@ -97,40 +97,137 @@ class TimezoneUpdater(object):
return lat_long_data
def read_ics(self, filename, lat_long_data):
"""Read a single zone's ICS files.
We keep only the lines we want, and we use the pure version of RRULE if
the versions differ. See Asia/Jerusalem for an example."""
with open(os.path.join(self.zoneinfo_path, filename), "r") as zone:
zoneinfo = zone.readlines()
"""Read a single zone's ICS files."""
with open(os.path.join(self.zoneinfo_pure_path, filename), "r") as zone:
zoneinfo_pure = zone.readlines()
ics_data = []
for i in range(0, len(zoneinfo)):
line = zoneinfo[i]
key = line[:line.find(":")]
# Loop through the lines of the file, splitting it into components.
components = []
current_component = None
for i in range(0, len(zoneinfo_pure)):
line = zoneinfo_pure[i].rstrip()
[key, value] = line.split(":", 1)
if key == "BEGIN":
if line != "BEGIN:VCALENDAR\r\n":
ics_data.append(line)
elif key == "END":
if line != "END:VCALENDAR\r\n":
ics_data.append(line)
elif key in ("TZID", "TZOFFSETFROM", "TZOFFSETTO", "TZNAME", "DTSTART"):
ics_data.append(line)
elif key == "RRULE":
if line == zoneinfo_pure[i]:
ics_data.append(line)
if line in ["BEGIN:STANDARD", "BEGIN:DAYLIGHT"]:
current_component = {"line": i, "type": value}
elif line in ["END:STANDARD", "END:DAYLIGHT"]:
components.append(current_component)
current_component = None
elif current_component:
if key == "RDATE":
if "rdates" not in current_component:
current_component["rdates"] = []
current_component["rdates"].append(value)
else:
sys.stderr.write("Using pure version of %s\n" % filename[:-4])
ics_data.append(zoneinfo_pure[i])
current_component[key] = value
# Create a copy of each component for every date that it started.
# Later, we'll sort them into order of starting date.
components_by_start_date = {}
for component in components:
max_rdate = int(component["DTSTART"][0:8])
components_by_start_date[max_rdate] = component
if "rdates" in component:
for rdate in component["rdates"]:
rdate = int(rdate[0:8])
max_rdate = max(rdate, max_rdate)
components_by_start_date[rdate] = component
component["valid_rdates"] = filter(
lambda rd: FUTURE_CUTOFF >= int(rd[0:8]) >= HISTORY_CUTOFF,
component["rdates"]
)
component["max_date"] = max_rdate
# Sort, and keep only the components in use since the cutoff date.
kept_components = []
finished = False
for key in sorted(components_by_start_date.keys(), reverse=True):
if key > FUTURE_CUTOFF:
continue
component = components_by_start_date[key]
if finished and "RRULE" not in component:
continue
if "used" in component:
continue
component["used"] = True
kept_components.append(component)
if key <= HISTORY_CUTOFF:
finished = True
for i in range(len(kept_components)):
component = kept_components[i]
last = i == len(kept_components) - 1
# In this block of code, we attempt to match what vzic does when
# creating "Outlook-compatible" timezone files. This is to minimise
# changes in our zones.json file. And to be more Outlook-compatible.
if int(component["DTSTART"][0:8]) < HISTORY_CUTOFF:
if not last and "valid_rdates" in component and len(component["valid_rdates"]) > 0:
component["DTSTART"] = component["valid_rdates"][0]
continue
# Change the start date to what it would've been in 1970.
start_date = "19700101"
start_time = "T000000"
if "RRULE" in component:
rrule = dict(part.split("=") for part in component["RRULE"].split(";"))
bymonth = int(rrule["BYMONTH"])
weekday = rrule["BYDAY"].lstrip("-012345")
weekday_index = ["MO", "TU", "WE", "TH", "FR", "SA", "SU"].index(weekday)
if "BYMONTHDAY" in rrule:
bymonthday = list(int(d) for d in rrule["BYMONTHDAY"].split(","))
for day in bymonthday:
test_day = date(1970, bymonth, day)
if test_day.weekday() == weekday_index:
start_date = test_day.strftime("%Y%m%d")
start_time = component["DTSTART"][8:]
break
elif "BYDAY" in rrule:
which_weekday = int(rrule["BYDAY"].rstrip("AEFHMORSTUW"))
days_matching = [0]
test_day = date(1970, bymonth, 1)
while test_day.month == bymonth:
if test_day.weekday() == weekday_index:
days_matching.append(test_day)
test_day = test_day + timedelta(days=1)
start_date = days_matching[which_weekday].strftime("%Y%m%d")
start_time = component["DTSTART"][8:]
component["DTSTART"] = start_date + start_time
# Sort the components back into the order they appeared in the original file.
# This is to minimise changes in our zones.json file.
kept_components.sort(key=lambda b: b["line"])
zone_name = filename[:-4]
ics = []
for component in kept_components:
ics_lines = []
ics_lines.append("BEGIN:%s" % component["type"])
if len(kept_components) == 1 or len(component["TZOFFSETFROM"]) != 5:
ics_lines.append("TZOFFSETFROM:%s" % component["TZOFFSETTO"])
else:
ics_lines.append("TZOFFSETFROM:%s" % component["TZOFFSETFROM"])
ics_lines.append("TZOFFSETTO:%s" % component["TZOFFSETTO"])
if "TZNAME" in component:
ics_lines.append("TZNAME:%s" % component["TZNAME"])
ics_lines.append("DTSTART:%s" % component["DTSTART"])
if "RRULE" in component:
ics_lines.append("RRULE:%s" % component["RRULE"])
elif len(kept_components) > 1 and "valid_rdates" in component:
for rdate in component["valid_rdates"]:
ics_lines.append("RDATE:%s" % rdate)
ics_lines.append("END:%s" % component["type"])
ics.append("\r\n".join(ics_lines))
zone_data = {
"ics": "".join(ics_data).rstrip()
"ics": ics,
}
zone_name = filename[:-4]
if zone_name in lat_long_data:
zone_data["latitude"] = lat_long_data[zone_name][0]
zone_data["longitude"] = lat_long_data[zone_name][1]
@ -144,6 +241,8 @@ class TimezoneUpdater(object):
zones = {}
for entry in os.listdir(path):
if entry == "Etc":
continue
fullpath = os.path.join(path, entry)
if os.path.isdir(fullpath):
zones.update(self.read_dir(fullpath, process_zone, os.path.join(prefix, entry)))
@ -219,7 +318,7 @@ class TimezoneUpdater(object):
self.run_vzic(vzic_path)
lat_long_data = self.read_zones_tab()
newzones = self.read_dir(self.zoneinfo_path,
newzones = self.read_dir(self.zoneinfo_pure_path,
lambda fn: self.read_ics(fn, lat_long_data))
newaliases = self.link_removed_zones(zonesjson["zones"], newzones, links)
@ -307,21 +406,13 @@ def main():
# A test data update must occur before the zones.json file gets updated to have meaningful data
create_test_data(json_file)
zoneinfo_path = tempfile.mkdtemp(prefix="zones")
zoneinfo_pure_path = tempfile.mkdtemp(prefix="zones")
updater = TimezoneUpdater(args.tzdata_path, zoneinfo_path, zoneinfo_pure_path)
updater = TimezoneUpdater(args.tzdata_path, zoneinfo_pure_path)
updater.run(json_file, tzprops_file, args.vzic_path)
# Clean up.
shutil.rmtree(zoneinfo_path)
shutil.rmtree(zoneinfo_pure_path)
print """
When updating timezone definitions, please check the zones America/Campo_Grande,
America/Cuiaba, and America/Sao_Paulo are not reset to their previous buggy state.
See bug 1515937 for more information.
"""
if __name__ == "__main__":
main()

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@ -498,7 +498,12 @@
},
"Africa/Casablanca": {
"ics": [
"BEGIN:STANDARD\r\nTZOFFSETFROM:+0100\r\nTZOFFSETTO:+0100\r\nTZNAME:+01\r\nDTSTART:19700101T000000\r\nEND:STANDARD"
"BEGIN:STANDARD\r\nTZOFFSETFROM:+0000\r\nTZOFFSETTO:+0000\r\nTZNAME:+00\r\nDTSTART:19700101T000000\r\nEND:STANDARD",
"BEGIN:DAYLIGHT\r\nTZOFFSETFROM:+0000\r\nTZOFFSETTO:+0100\r\nTZNAME:+01\r\nDTSTART:20180325T020000\r\nRDATE:20180325T020000\r\nRDATE:20180617T020000\r\nEND:DAYLIGHT",
"BEGIN:STANDARD\r\nTZOFFSETFROM:+0100\r\nTZOFFSETTO:+0000\r\nTZNAME:+00\r\nDTSTART:20180513T030000\r\nRDATE:20180513T030000\r\nEND:STANDARD",
"BEGIN:STANDARD\r\nTZOFFSETFROM:+0000\r\nTZOFFSETTO:+0100\r\nTZNAME:+01\r\nDTSTART:20190609T020000\r\nRDATE:20190609T020000\r\nRDATE:20200524T020000\r\nRDATE:20210516T020000\r\nRDATE:20220508T020000\r\nEND:STANDARD",
"BEGIN:STANDARD\r\nTZOFFSETFROM:+0100\r\nTZOFFSETTO:+0100\r\nTZNAME:+01\r\nDTSTART:20181028T030000\r\nRDATE:20181028T030000\r\nEND:STANDARD",
"BEGIN:DAYLIGHT\r\nTZOFFSETFROM:+0100\r\nTZOFFSETTO:+0000\r\nTZNAME:+00\r\nDTSTART:20190505T030000\r\nRDATE:20190505T030000\r\nRDATE:20200419T030000\r\nRDATE:20210411T030000\r\nRDATE:20220327T030000\r\nEND:DAYLIGHT"
],
"latitude": "+0333900",
"longitude": "-0073500"
@ -548,7 +553,12 @@
},
"Africa/El_Aaiun": {
"ics": [
"BEGIN:STANDARD\r\nTZOFFSETFROM:+0100\r\nTZOFFSETTO:+0100\r\nTZNAME:+01\r\nDTSTART:19700101T000000\r\nEND:STANDARD"
"BEGIN:STANDARD\r\nTZOFFSETFROM:-0100\r\nTZOFFSETTO:+0000\r\nTZNAME:+00\r\nDTSTART:19700101T000000\r\nEND:STANDARD",
"BEGIN:DAYLIGHT\r\nTZOFFSETFROM:+0000\r\nTZOFFSETTO:+0100\r\nTZNAME:+01\r\nDTSTART:20180325T020000\r\nRDATE:20180325T020000\r\nRDATE:20180617T020000\r\nEND:DAYLIGHT",
"BEGIN:STANDARD\r\nTZOFFSETFROM:+0100\r\nTZOFFSETTO:+0000\r\nTZNAME:+00\r\nDTSTART:20180513T030000\r\nRDATE:20180513T030000\r\nEND:STANDARD",
"BEGIN:STANDARD\r\nTZOFFSETFROM:+0100\r\nTZOFFSETTO:+0100\r\nTZNAME:+01\r\nDTSTART:20181028T030000\r\nRDATE:20181028T030000\r\nEND:STANDARD",
"BEGIN:DAYLIGHT\r\nTZOFFSETFROM:+0100\r\nTZOFFSETTO:+0000\r\nTZNAME:+00\r\nDTSTART:20190505T030000\r\nRDATE:20190505T030000\r\nRDATE:20200419T030000\r\nRDATE:20210411T030000\r\nRDATE:20220327T030000\r\nEND:DAYLIGHT",
"BEGIN:STANDARD\r\nTZOFFSETFROM:+0000\r\nTZOFFSETTO:+0100\r\nTZNAME:+01\r\nDTSTART:20190609T020000\r\nRDATE:20190609T020000\r\nRDATE:20200524T020000\r\nRDATE:20210516T020000\r\nRDATE:20220508T020000\r\nEND:STANDARD"
],
"latitude": "+0270900",
"longitude": "-0131200"
@ -744,7 +754,8 @@
},
"Africa/Sao_Tome": {
"ics": [
"BEGIN:STANDARD\r\nTZOFFSETFROM:+0000\r\nTZOFFSETTO:+0000\r\nTZNAME:GMT\r\nDTSTART:19700101T000000\r\nEND:STANDARD"
"BEGIN:STANDARD\r\nTZOFFSETFROM:+0000\r\nTZOFFSETTO:+0100\r\nTZNAME:WAT\r\nDTSTART:20180101T010000\r\nRDATE:20180101T010000\r\nEND:STANDARD",
"BEGIN:STANDARD\r\nTZOFFSETFROM:+0100\r\nTZOFFSETTO:+0000\r\nTZNAME:GMT\r\nDTSTART:20190101T020000\r\nRDATE:20190101T020000\r\nEND:STANDARD"
],
"latitude": "+0002000",
"longitude": "+0064400"
@ -988,8 +999,10 @@
},
"America/Campo_Grande": {
"ics": [
"BEGIN:DAYLIGHT\r\nTZOFFSETFROM:-0400\r\nTZOFFSETTO:-0300\r\nTZNAME:-03\r\nDTSTART:19701101T000000\r\nRRULE:FREQ=YEARLY;BYMONTH=11;BYDAY=1SU\r\nEND:DAYLIGHT",
"BEGIN:STANDARD\r\nTZOFFSETFROM:-0300\r\nTZOFFSETTO:-0400\r\nTZNAME:-04\r\nDTSTART:19700215T000000\r\nRRULE:FREQ=YEARLY;BYMONTH=2;BYDAY=3SU\r\nEND:STANDARD"
"BEGIN:DAYLIGHT\r\nTZOFFSETFROM:-0400\r\nTZOFFSETTO:-0300\r\nTZNAME:-03\r\nDTSTART:20181104T000000\r\nRRULE:FREQ=YEARLY;BYMONTH=11;BYDAY=1SU\r\nEND:DAYLIGHT",
"BEGIN:DAYLIGHT\r\nTZOFFSETFROM:-0400\r\nTZOFFSETTO:-0300\r\nTZNAME:-03\r\nDTSTART:19700101T000000\r\nEND:DAYLIGHT",
"BEGIN:STANDARD\r\nTZOFFSETFROM:-0300\r\nTZOFFSETTO:-0400\r\nTZNAME:-04\r\nDTSTART:20180218T000000\r\nRDATE:20180218T000000\r\nRDATE:20190217T000000\r\nEND:STANDARD",
"BEGIN:STANDARD\r\nTZOFFSETFROM:-0400\r\nTZOFFSETTO:-0400\r\nTZNAME:-04\r\nDTSTART:20200216T000000\r\nRDATE:20200216T000000\r\nRDATE:20210221T000000\r\nRDATE:20220220T000000\r\nEND:STANDARD"
],
"latitude": "-0202700",
"longitude": "-0543700"
@ -1054,8 +1067,10 @@
},
"America/Cuiaba": {
"ics": [
"BEGIN:DAYLIGHT\r\nTZOFFSETFROM:-0400\r\nTZOFFSETTO:-0300\r\nTZNAME:-03\r\nDTSTART:19701101T000000\r\nRRULE:FREQ=YEARLY;BYMONTH=11;BYDAY=1SU\r\nEND:DAYLIGHT",
"BEGIN:STANDARD\r\nTZOFFSETFROM:-0300\r\nTZOFFSETTO:-0400\r\nTZNAME:-04\r\nDTSTART:19700215T000000\r\nRRULE:FREQ=YEARLY;BYMONTH=2;BYDAY=3SU\r\nEND:STANDARD"
"BEGIN:DAYLIGHT\r\nTZOFFSETFROM:-0400\r\nTZOFFSETTO:-0300\r\nTZNAME:-03\r\nDTSTART:20181104T000000\r\nRRULE:FREQ=YEARLY;BYMONTH=11;BYDAY=1SU\r\nEND:DAYLIGHT",
"BEGIN:DAYLIGHT\r\nTZOFFSETFROM:-0400\r\nTZOFFSETTO:-0300\r\nTZNAME:-03\r\nDTSTART:19700101T000000\r\nEND:DAYLIGHT",
"BEGIN:STANDARD\r\nTZOFFSETFROM:-0300\r\nTZOFFSETTO:-0400\r\nTZNAME:-04\r\nDTSTART:20180218T000000\r\nRDATE:20180218T000000\r\nRDATE:20190217T000000\r\nEND:STANDARD",
"BEGIN:STANDARD\r\nTZOFFSETFROM:-0400\r\nTZOFFSETTO:-0400\r\nTZNAME:-04\r\nDTSTART:20200216T000000\r\nRDATE:20200216T000000\r\nRDATE:20210221T000000\r\nRDATE:20220220T000000\r\nEND:STANDARD"
],
"latitude": "-0153500",
"longitude": "-0560500"
@ -1174,8 +1189,10 @@
},
"America/Grand_Turk": {
"ics": [
"BEGIN:STANDARD\r\nTZOFFSETFROM:-0400\r\nTZOFFSETTO:-0500\r\nTZNAME:EST\r\nDTSTART:19701101T020000\r\nRRULE:FREQ=YEARLY;BYMONTH=11;BYDAY=1SU\r\nEND:STANDARD",
"BEGIN:DAYLIGHT\r\nTZOFFSETFROM:-0500\r\nTZOFFSETTO:-0400\r\nTZNAME:EDT\r\nDTSTART:19700308T020000\r\nRRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=2SU\r\nEND:DAYLIGHT"
"BEGIN:STANDARD\r\nTZOFFSETFROM:-0400\r\nTZOFFSETTO:-0500\r\nTZNAME:EST\r\nDTSTART:20181104T020000\r\nRRULE:FREQ=YEARLY;BYMONTH=11;BYDAY=1SU\r\nEND:STANDARD",
"BEGIN:DAYLIGHT\r\nTZOFFSETFROM:-0500\r\nTZOFFSETTO:-0400\r\nTZNAME:EDT\r\nDTSTART:20190310T020000\r\nRRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=2SU\r\nEND:DAYLIGHT",
"BEGIN:STANDARD\r\nTZOFFSETFROM:-0400\r\nTZOFFSETTO:-0400\r\nTZNAME:AST\r\nDTSTART:19700101T000000\r\nEND:STANDARD",
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