get date time from past

[Trader.student]

how i can access to specific houre of specific day ? for example current day is 2023.07.19 11:00 and i want to save date and time of 20 days ago .  

[Miguel Angel Vico Alba]

Trader.student: how i can access to specific houre of specific day ? for example current day is 2023.07.19 11:00 and i want to save date and time of 20 days ago .  

Hi,

you will find hundreds of examples in the CodeBase section. (https://www.mql5.com/en/code)

It doesn't mention if it is for MQL4 or MQL5. Make sure of that when you do the search.

Here you have the complete documentation of the MQL5 language: https://www.mql5.com/en/docs

And here hundreds of articles: https://www.mql5.com/en/search#!keyword=datetime&module=mql5_module_articles

[Carl Schreiber]

As a beginner you might profit from reading this in advance:

1) HowTo Begin with MT5 instalation:
    https://www.metatrader5.com/en/terminal/help/start_advanced/installation
    https://www.mql5.com/en/forum/432663#comment_42071081
    https://www.metatrader5.com/de/terminal/help
2) broker: https://www.mql5.com/en/forum/446683
3) MQL5:
    If you place the cursor on an MQL function and press F1, you will see the reference directly, many with examples of copying and pasting the fastest form to code.
    https://www.mql5.com/en/articles/496
    https://www.mql5.com/en/articles/100
    and for debugging: https://www.metatrader5.com/en/metaeditor/help/development/debug
    https://www.mql5.com/en/search#!keyword=cookbook
    "Bear in mind there's virtually nothing that hasn't already been programmed for MT4/MT5 and is ready for you - so searching gives better results than AI or ChatGPT!" (Carl Schreiber):
    => Search in the articles: https://www.mql5.com/en/articles
    => Search in the codebase: https://www.mql5.com/en/code
    => Search in general: https://www.mql5.com/en/search or via Google with: "site:mql5.com .." (forgives misspelling)
4) indicators: see this series of articles:
    https://www.mql5.com/en/users/m.aboud/publications
    Each article explains an indicator (built into MT5) and what it tells you, and how you might use it in an EA.

[William Roeder]

Trader.student: how i can access to specific houre of specific day ? for example current day is 2023.07.19 11:00 and i want to save date and time of 20 days ago .  

1. You probably do not want 20 days ago, you probably want 20 trading days ago. Isolate the time of your datetime, and access n yesterdays ago.
             Find bar of the same time one day ago - MQL4 programming forum #1 & #6 (2017)

2. You could also use D1 timeframe, but then you have to deal with 4066 / synchronization issue.

   On MT4: Unless the current chart is that specific symbol(s)/TF(s) referenced, you must handle 4066/4073 errors before accessing candle/indicator values.
             Download history in MQL4 EA - MQL4 programming forum - Page 3 #26.4 (2019)

   On MT5: Unless the current chart is that specific pair/TF, you must synchronize the terminal Data from the Server before accessing candle/indicator values.
             Error 4806 while using CopyBuffer() - Expert Advisors and Automated Trading - MQL5 programming forum #10 (2020)
             Is it mystical?! It is! - Withdraw - Technical Indicators - MQL5 programming forum (2019)
             Timeseries and Indicators Access / Data Access - Reference on algorithmic/automated trading language for MetaTrader 5
             Synchronize Server Data with Terminal Data - Symbols - General - MQL5 programming forum #2 (2018)
             SymbolInfoInteger doesn't work - Symbols - General - MQL5 programming forum (2019)