概述
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News Keeper

The News Keeper Expert Advisor is created to implement the strategy of news trading.

It places pending orders at a specified time (+/- specified number of seconds) at a specified distance (+/- points) from the current price, shortly before the release of the news.
Modifies the pending orders using two methods — with the arrival of a new tick (1) or with the arrival of a new bar (2)
Instantly removes the second opposite order once the first triggers
Expiration of orders by seconds
Time channel for opening positions in cases of alternating ticks
Trades are marked with individual Magic numbers which eliminates the conflict during the operation in conjunction with other advisors.

Input Parameters

Sent Sell Stop — Set Sell Stop.
Sent Buy Stop — Set Buy Stop.
Date time input — Date and time to place orders.
Add sec (open) — N seconds.

In MT4 the EA operation takes place at the arrival of a new tick. Due to the sluggish market situation (especially at night), a tick might not arrive in one second time — in that case the orders will not be placed. For such situations the function 'Add sec' is implemented, which allows to set the range of 4 seconds, for example. The delays are unlikely during the daytime. At night, it is recommended to set the range to 5-30 seconds, depending on the activity in the market.

Example 1. Day

Expected News Release Date 10.10.2010 15:30

You set the 'Date Time Input' to 10.10.2010 15:29:57, i.e. 3 seconds before the news release. In this case, Add sec must be equal to 2. In fact, you specified the order placement range of 15:29:57 — 15:30:59 to the EA, where the difference between 57 and 59, equal to 2 seconds, is specified in the Add sec parameter.

Example 2. Night

Expected News Release Date 10.10.2010 03:30

You set the 'Date Time Input' to 10.10.2010 03:29:50, i.e. 10 seconds before the news release. In this case, Add sec must be equal to 9 seconds. In fact, you specified the order placement range of 03:29:50 — 03:29:59 to the EA, where the difference between 50 and 59 of 2 seconds is specified in the Add sec parameter.

This gives sufficient range in the case of the overnight trading and variable ticks.
Points From Price — N points on 5-digits

The number of points of the offset from the current price for the EA to place order(s). In case a strong movement is expected, it is recommended to set the value to 150+ points (on 5-digits). If there is a possibility that the movements will be insignificant before the news release (for example, during nighttime), then N can be reduced, e.g. to 70+ points.
Expiration? — Automatic removal of orders after N (seconds).
Expiration (sec) — N seconds.

This parameter specifies the time, after which the EA will automatically delete the pending orders in case they both did not trigger.

Expiration is calculated by the formula: Time specified in Date Time Input + N seconds in the Expiration (Sec) field.

Example 3.

Date Time Input = 15:29:50

Add Sec = 9 seconds

Expiration? = True

Expiration (sec) = 15 seconds

The EA will delete orders exactly at 15:29:50 + 15 seconds, that is at 15:30:05.
Modify orders (new tick)? — modify the orders with the arrival of a new tick, i.e. keep the distance from the price, specified in the "Points From Price".
Modify orders (new bar)? — modify the orders with the arrival of a new bar, i.e. keep the distance from the price, specified in the "Points From Price".