In realtime conditions we may be interested in executing some parts of our formula only once per bar, when a new bar is created (e.g. for auto-trading purposes or just for notification). To do that – we would need to identify the very moment when new bar appears.<\/p>

This can be done using static variables to record the timestamp of the most recent bar, then comparing current reading with the recorded value. Once the difference is detected – we can conditionally run our code and update the recorded time info.<\/p>

Such an approach will work if we use timestamps that don’t change with each tick, so preferred option is to use Start Time of Interval<\/strong> for timestamp display (for daily and higher intervals we should unmark “override” box):<\/p>

<\/p>

Then we can use the following code (this sample formula will just play a ding.wav system sound when the new bar is detected):<\/p><\/span>\/\/ read last bar date\/time
<\/span>lastBartime <\/span>= <\/span>LastValue<\/span>( <\/span>DateTime<\/span>() );

<\/span>\/\/ we use per-symbol variable
\/\/ you may consider to add GetChartID() key if you want
\/\/ to use the formula in multiple charts shown at the same time
<\/span>varName <\/span>= <\/span>Name<\/span>() + <\/span>"_lastdt"<\/span>;

<\/span>\/\/ read recorded date\/time from last execution
<\/span>recordedTimestamp <\/span>= <\/span>Nz<\/span>( <\/span>StaticVarGet<\/span>( <\/span>varName <\/span>) );

<\/span>\/\/ code runs conditionally only when new bar is detected
<\/span>if( <\/span>lastBarTime <\/span>!= <\/span>recordedTimestamp <\/span>)
{
    <\/span>\/\/ record new bar datetime
    <\/span>StaticVarSet<\/span>( <\/span>varName<\/span>, <\/span>lastBartime <\/span>);

    <\/span>\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/
    \/\/ main code here
    <\/span>PlaySound<\/span>( <\/span>"c:\\\\windows\\\\media\\\\ding.wav" <\/span>);
    <\/span>\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/
<\/span>}

<\/span>\/\/ sample indicator code
<\/span>Plot<\/span>( <\/span>Close<\/span>, <\/span>"Close"<\/span>, <\/span>colorDefault<\/span>, <\/span>styleBar <\/span>)<\/code>

Newer AmiBroker versions (>5.60) can use this for reading last bar timestamp (this is faster than using DateTime() function).
lastBartime <\/span>= <\/span>Status<\/span>(<\/span>"lastbarend"<\/span>)<\/code>","protected":false},"excerpt":{"rendered":"

In realtime conditions we may be interested in executing some parts of our formula only once per bar, when a new bar is created (e.g. for auto-trading purposes or just for notification). To do that – we would need to identify the very moment when new bar appears.This can be done using static variables to […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[3],"tags":[55,94,95],"_links":{"self":[{"href":"https:\/\/www.amibroker.com\/wordpress\/kb\/wp-json\/wp\/v2\/posts\/1316"}],"collection":[{"href":"https:\/\/www.amibroker.com\/wordpress\/kb\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.amibroker.com\/wordpress\/kb\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.amibroker.com\/wordpress\/kb\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.amibroker.com\/wordpress\/kb\/wp-json\/wp\/v2\/comments?post=1316"}],"version-history":[{"count":2,"href":"https:\/\/www.amibroker.com\/wordpress\/kb\/wp-json\/wp\/v2\/posts\/1316\/revisions"}],"predecessor-version":[{"id":1319,"href":"https:\/\/www.amibroker.com\/wordpress\/kb\/wp-json\/wp\/v2\/posts\/1316\/revisions\/1319"}],"wp:attachment":[{"href":"https:\/\/www.amibroker.com\/wordpress\/kb\/wp-json\/wp\/v2\/media?parent=1316"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.amibroker.com\/wordpress\/kb\/wp-json\/wp\/v2\/categories?post=1316"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.amibroker.com\/wordpress\/kb\/wp-json\/wp\/v2\/tags?post=1316"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}