For my strategy I need to know the opening times of all exchanges (NY, Tokyo, Sidney, London).
So I have those parameters:
private int NYStart = 830;
private int TokyoStart = 1800;
private int SydneyStart = 1800;
private int LondonStart = 200;
Its for CST so I also have a parameter for CSTOffsetHours.
Now I need to change those opening hours depending on different DST (day light saving times).
So that is how I do it:
int MonthDay = ToDay(Time) % 10000;
if (MonthDay > 313 && MonthDay < 1106) TokyoStart -= 100;
if (!(MonthDay > 403 && MonthDay < 1002)) SydneyStart += 100;
if (MonthDay > 313 && MonthDay < 2603) TokyoStart -= 100;
if (MonthDay > 313 && MonthDay < 1106) LondonStart -= 100;
if (MonthDay > 1030 && MonthDay < 1106) LondonStart += 100;
Why are you using in variables instead of DateTime variables ?
You want to manipulate "the opening times of all exchanges", so it will be much easier to manipulate DateTime than int, as you have all the needed classes and methods to play with timezones.
See TimeZoneInfo class, ConvertTime, DateTimeOffset, ...
You know in which timezone are NY, Tokyo, ..., so you're also able to convert any date from a timezone to another one. And as these classes are "DST aware", I don't see where could be the problem to do what you want to do.
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(1) This table does not take into account the different daylight saving schedules, so for Europe it will not work from March 13 to March 27, 2011 and from October 30 to November 6, 2011. Tokyo does not have any DST, so the schedule will run into problems during the summer. To display the times correctly, you would need 4 different schedules.
(2) To display the Tokyo open, you would need to introduce a column with Tokyo time, as it does not match any of the other timezones and does not use DST.
Opening hours of FOREX markets
I have visited about 20 websites for FOREX opening hours and this is the result:
Tokyo Open 6:00 PM EST in winter, 7:00 PM EST in summer
Tokyo Close 4:00 AM EST in summer 5:00 AM EST in summer
Frankfurt Open 2:00 AM EST
Frankfurt Close 11:00 AM EST
London Open 3:00 AM EST (except for the 3 weeks listed above)
London Close 12:00 PM EST (except for the 3 weeks listed above)
New York Open 8:00 AM EST
New York Close 5:00 PM EST
If I translate from your PDF: Euro Open => Frankfurt Open, London Activity => London Open, European Close => London Close, we get the same values for Europe.
I get a different value for New York (1 hour later), I only have found 4:00 PM as the New York close occasionally.
For Tokyo there are different hours for winter and summer, your opening hours at 8:00 PM are later than both the winter and summer times that I have found.