How to Convert a String to Datetime in MQL5?

30.10.2025
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36 min
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Working with time is fundamental in algorithmic trading. Whether logging events, parsing historical data from external sources, or scheduling operations, handling datetime values accurately is paramount. MQL5 provides specific functions to manage time, but often, this data arrives in string format. Converting these string representations into the MQL5 datetime type is a frequent requirement for Expert Advisors, custom indicators, and scripts.

Understanding the Importance of Datetime Objects in MQL5

The datetime type in MQL5 is an alias for the long type and represents the number of seconds elapsed since January 1, 1970 (Unix epoch time). This standardized format is crucial for various MQL5 operations:

Timestamping: Marking specific events like order execution, indicator signal generation, or log entries.
Time Comparisons: Determining if one event occurred before or after another.
Time-Based Logic: Implementing strategies based on time periods (e.g., trading only during specific market hours) or calculating durations.
Data Synchronization: Aligning data from different sources based on their timestamps.

Using the native datetime type ensures consistent and efficient time-based calculations and comparisons within the MetaTrader environment.

Overview of Common String Formats for Dates and Times

Datetime information can appear in numerous string formats. While MQL5’s StringToTime() function can handle several common ones, developers often encounter variations. Typical formats include:

YYYY.MM.DD HH:MM (e.g., 2023.10.27 15:30)
YYYY/MM/DD HH:MM:SS (e.g., 2023/10/27 15:30:45)
MM/DD/YYYY HH:MM (e.g., 10/27/2023 03:30 PM)
DD.MM.YYYY HH:MM:SS (e.g., 27.10.2023 15:30:45)
ISO 8601 variations (though StringToTime support is limited for full ISO 8601 including timezones).

Understanding the expected format of your input string is the first step in successful conversion.

Why Convert Strings to Datetime?

The primary reason for converting a string to a datetime object in MQL5 is to enable reliable time-based operations. You cannot directly perform time arithmetic or comparisons on a string. Conversion allows you to:

Use the date and time in functions that require a datetime argument (e.g., iClose(), SeriesInfoInteger(..., SERIES_FIRSTDATE)).
Compare timestamps accurately to sequence events.
Calculate time differences (durations).
Store timestamps in datetime variables or arrays for easy access and manipulation.
Integrate time data obtained from external sources (files, web requests, indicators) into your trading logic.

Without conversion, time data received as a string is essentially text, devoid of its chronological meaning within the MQL5 trading context.

Using StringToTime() Function for Conversion

MQL5 provides the built-in function StringToTime() specifically for converting strings into datetime values. This is the standard and most efficient way to perform this task within the language.

Syntax and Parameters of StringToTime()

The function signature is straightforward:

datetime StringToTime(string time_string);

time_string: The input string containing the date and/or time information to be converted.

StringToTime() attempts to parse the provided string based on common date and time format patterns. If successful, it returns the corresponding datetime value (seconds since epoch). If the conversion fails, it returns 0.

Illustrative Examples of Basic String to Datetime Conversion

Let’s look at how StringToTime() handles some standard formats:

void OnStart()
{
   string timeString1 = "2023.10.27 15:30";
   string timeString2 = "2023/11/05"; // Date only
   string timeString3 = "22:15:00"; // Time only (assumes current date)
   string timeString4 = "12/25/2024 09:00";
   string timeString5 = "01.01.2025 10:00:30";

   datetime timeValue1 = StringToTime(timeString1);
   datetime timeValue2 = StringToTime(timeString2);
   datetime timeValue3 = StringToTime(timeString3);
   datetime timeValue4 = StringToTime(timeString4);
   datetime timeValue5 = StringToTime(timeString5);

   PrintFormat("String '%s' converted to datetime: %s", timeString1, TimeToString(timeValue1));
   PrintFormat("String '%s' converted to datetime: %s", timeString2, TimeToString(timeValue2));
   PrintFormat("String '%s' converted to datetime: %s", timeString3, TimeToString(timeValue3));
   PrintFormat("String '%s' converted to datetime: %s", timeString4, TimeToString(timeValue4));
   PrintFormat("String '%s' converted to datetime: %s", timeString5, TimeToString(timeValue5));

   // Example of failure
   string invalidString = "October 27, 2023";
   datetime invalidValue = StringToTime(invalidString);
   PrintFormat("String '%s' converted to datetime: %s (0 means failure)", invalidString, invalidValue);
}
/* Expected Output (approximate, depends on execution date for time-only):
String '2023.10.27 15:30' converted to datetime: 2023.10.27 15:30
String '2023/11/05' converted to datetime: 2023.11.05 00:00
String '22:15:00' converted to datetime: [Current Date].22:15
String '12/25/2024 09:00' converted to datetime: 2024.12.25 09:00
String '01.01.2025 10:00:30' converted to datetime: 2025.01.01 10:00
String 'October 27, 2023' converted to datetime: 0 (0 means failure)
*/

As you can see, the function successfully parses dates and times in common YYYY.MM.DD, YYYY/MM/DD, MM/DD/YYYY, and DD.MM.YYYY formats, accepting various separators (., /, -, spaces, :) and handling both date and time components or just one of them.

Handling Different Date and Time Formats

StringToTime() is flexible but not omniscient. It recognizes common separators (., /, -) and time separators (:). It can parse strings containing:

Only date (YYYY.MM.DD, DD/MM/YYYY, MM-DD-YYYY, etc.). Time defaults to 00:00:00.
Only time (HH:MM, HH:MM:SS). Date defaults to the current date.
Both date and time.

It generally expects year, month, and day components and hour, minute, and second components. However, it does not handle formats like Month Day, Year (e.g., “October 27, 2023”), full ISO 8601 with timezone offsets (2023-10-27T10:00:00+01:00), or formats with AM/PM indicators directly. For such custom or complex formats, you would need to preprocess the string manually using string manipulation functions (StringSplit, StringReplace, StringSubstr) before passing it to StringToTime() or assemble the date/time components using the StructToTime() function with the MqlDateTime structure.

Dealing with Time Zones and Datetime Offsets

Time zones are a critical consideration when working with timestamps, especially when dealing with data from different sources or servers. MQL5 operates primarily using the server time of the connected trading server.

Understanding Time Zone Considerations in MQL5

All built-in MQL5 time functions (TimeCurrent, TimeTradeServer, TimeLocal, TimeGMT, TimeToStruct, StructToTime, TimeToString, StringToTime) inherently work with or relate to the concept of time zones.

TimeTradeServer(): Returns the current time on the trading server.
TimeLocal(): Returns the current time on the user’s computer.
TimeGMT(): Returns the current Coordinated Universal Time (UTC).

Importantly, StringToTime() parses the input string as if it were in the server’s time zone. It does not have built-in support for parsing time zone abbreviations (like “EST”, “CET”) or ISO 8601 offsets (+01:00, -05:00). The resulting datetime value is relative to the server’s time epoch.

Converting String with Time Zone Information

If your input string contains time zone information (e.g., “2023-10-27 10:00:00 +0200”), StringToTime() will ignore the time zone part. To correctly interpret such a string relative to a specific time zone, you would need to manually parse the date, time, and the time zone offset from the string. Then, you would convert the date and time part (without the offset) using StringToTime(), and finally, adjust the resulting datetime value by adding or subtracting the parsed offset in seconds.

// Example: Parsing 'YYYY-MM-DD HH:MM:SS +ZZZZ' (simplified, assumes fixed format)
datetime ParseStringWithOffset(string timeString)
{
   int len = StringLen(timeString);
   if (len < 25) return 0; // Basic length check for 'YYYY-MM-DD HH:MM:SS +ZZZZ'

   string dateTimePart = StringSubstr(timeString, 0, 19); // YYYY-MM-DD HH:MM:SS
   string offsetPart = StringSubstr(timeString, 20, 5);   // +ZZZZ or -ZZZZ

   datetime baseTime = StringToTime(dateTimePart);
   if (baseTime == 0) return 0; // Failed to parse date/time part

   // Parse offset: +ZZZZ or -ZZZZ (e.g., +0200)
   int offsetHours = (int)StringToInteger(StringSubstr(offsetPart, 1, 2));
   int offsetMinutes = (int)StringToInteger(StringSubstr(offsetPart, 3, 2));
   int totalOffsetSeconds = (offsetHours * 3600) + (offsetMinutes * 60);

   // Adjust time. Note: time zone offset usually means 'this time occurred at X offset from UTC'.
   // StringToTime parses relative to server time. To get UTC equivalent, we might need
   // to factor in the server's offset from UTC. A simpler approach is if the string
   // is given in a known reference (like UTC) and you need to convert to server time.
   // For 'YYYY-MM-DD HH:MM:SS +ZZZZ', the time is ZZZZ ahead of UTC. If StringToTime
   // gives server time, and server is YYYY ahead of UTC, the difference is ZZZZ-YYYY.
   // This is complex. A common scenario is converting UTC string to server time.

   // Assuming the string is UTC ('YYYY-MM-DD HH:MM:SS +0000' implicitly or explicitly)
   // and you want server time:
   // server_time = utc_time + server_utc_offset
   // If the string *is* already in server time format and you want UTC:
   // utc_time = server_time - server_utc_offset

   // Let's assume the *intent* is to get a datetime in the *server's* frame of reference
   // that corresponds to the specified UTC time indicated by the string and offset.
   // The time in the string (HH:MM:SS) adjusted by its offset (+ZZZZ) gives the UTC time.
   // UTC Time = baseTime - totalOffsetSeconds; // Subtract offset because +ZZZZ means ZZZZ ahead of UTC
   // Then convert UTC to Server Time: Server Time = UTC Time + (Server UTC Offset)
   // Server UTC Offset = TimeTradeServer() - TimeGMT(); // Needs current time

   // A more practical use case: String gives time in UTC, convert to Server Time.
   // Example string: "2023-10-27 12:00:00 Z" or "2023-10-27 12:00:00+00:00"
   // If the string format is simply "YYYY-MM-DD HH:MM:SS" and it's documented as UTC:
   // datetime utcTime = StringToTime("2023-10-27 12:00:00"); // StringToTime parses as server time, this is wrong for UTC string
   // Correct approach requires manual parsing and StructToTime or adjusting after StringToTime *if* the string format is one StringToTime handles and it represents UTC.

   // If your input string is *always* in the format StringToTime handles (e.g., "YYYY.MM.DD HH:MM:SS")
   // but you know it represents UTC or another fixed timezone, you'd parse it,
   // and then adjust by a known offset.

   // Let's revisit the simple case: String is in server time.
   // StringToTime("2023.10.27 15:30") already gives the datetime in server time.

   // If the string is e.g. "2023.10.27 10:00" but this time is known to be EST (UTC-5).
   // To convert this EST time to Server Time:
   // 1. Convert EST string to EST datetime (using StringToTime, but assuming it represents EST)
   // datetime estTime = StringToTime("2023.10.27 10:00"); // This parses as server time, not EST.
   // To handle arbitrary time zones from strings reliably requires manual parsing of components
   // and assembling via StructToTime, then applying offsets.

   // Let's focus on the offset example again, but simplify the goal:
   // Convert a string *in a known timezone* to a datetime in the *server's timezone*.
   // Assume input "YYYY-MM-DD HH:MM:SS" is UTC.
   // Use StringToTime, which parses as server time, and compare to what it would be if it were UTC.
   // StringToTime("YYYY-MM-DD HH:MM:SS") gives server time T_s for string S_s = "YYYY-MM-DD HH:MM:SS".
   // If S_s represented UTC time T_u, where T_s = T_u + ServerUTCOffset.
   // Then T_u = T_s - ServerUTCOffset.
   // So, if the input string "YYYY-MM-DD HH:MM:SS" is UTC, the result of StringToTime(string) needs
   // to be adjusted by subtracting the server's current UTC offset.

   datetime parsedAsServer = StringToTime(dateTimePart); // Parses as server time
   if (parsedAsServer == 0) return 0;

   // If dateTimePart string *was* UTC, adjust to get actual UTC value:
   // This logic is flawed. StringToTime interprets the *literal* digits as server time.
   // To convert a UTC string "YYYY-MM-DD HH:MM:SS" to server time:
   // Manual parse components: YYYY, MM, DD, HH, MM, SS
   // Use StructToTime to get UTC datetime
   // Add Server UTC Offset

   // --- Correct Approach for known source timezone --- 
   // Assume the input string (e.g., "2023.10.27 12:00") is always in a specific timezone, say EST (UTC-5) year-round.
   // To convert this EST time to Server Time:
   // 1. Get the components from the string manually or using StringToTime for components:
   //    MqlDateTime dtStruct;
   //    if (!TimeToStruct(StringToTime("2023.10.27 12:00"), dtStruct)) return 0; // StringToTime parses as server, but gives components
   // 2. Assume these components (dtStruct) represent the time in the *source* timezone (EST).
   // 3. Convert these components *as if they were UTC* using StructToTime to get a reference UTC time.
   //    datetime utcReference = StructToTime(dtStruct); // This gives seconds since epoch assuming dtStruct was UTC - Incorrect.
   // The correct way is to get the time in seconds for the *source* timezone, then adjust.
   // Source Time in seconds = seconds since epoch for the string value *in its timezone*.
   // If StringToTime("2023.10.27 12:00") gives T_s, and this string represented EST:
   // EST = T_s (interpreted as server time)  - (ServerUTCOffset - EST_UTCOffset)
   // Or more simply: ServerTime = ESTTime + (ServerUTCOffset - EST_UTCOffset)
   // We need ESTTime in seconds. StructToTime is useful here.
   // Manually parse "2023.10.27 12:00" into Y,M,D,H,M,S.

   // Let's make a helper function for a *specific* source timezone (e.g., UTC)
   // Convert string "YYYY.MM.DD HH:MM:SS" (assumed UTC) to Server Time
   string utcString = "2023.10.27 12:00:00"; // Example UTC string
   datetime utcTimeVal = StringToTime(utcString); // Parses as Server Time
   // This is NOT the UTC datetime value. It's the Server Time value IF the digits were server time.

   // Correct way to get UTC datetime from a UTC string handled by StringToTime:
   MqlDateTime dtStructUTC;
   if (!TimeToStruct(StringToTime(utcString), dtStructUTC)) return 0;
   // dtStructUTC now holds components parsed from utcString *relative to server time*
   // E.g., if server is GMT+2 and utcString is "12:00", dtStructUTC will hold 12:00
   // The actual UTC time is 10:00. We need to subtract the server offset from these components.
   // This is complicated by DST.

   // A reliable method: Manually parse the string components Y, M, D, H, M, S.
   // Use StructToTime to get the datetime in seconds for the *source* timezone (e.g., UTC).
   // Then convert from source timezone seconds to server timezone seconds.

   // Example: Convert "2023-10-27 12:00:00" (UTC) to Server Time
   string datePart = StringSubstr(utcString, 0, 10);
   string timePart = StringSubstr(utcString, 11, 8);

   int year = (int)StringToInteger(StringSubstr(datePart, 0, 4));
   int month = (int)StringToInteger(StringSubstr(datePart, 5, 2));
   int day = (int)StringToInteger(StringSubstr(datePart, 8, 2));

   int hour = (int)StringToInteger(StringSubstr(timePart, 0, 2));
   int minute = (int)StringToInteger(StringSubstr(timePart, 3, 2));
   int second = (int)StringToInteger(StringSubstr(timePart, 6, 2));

   MqlDateTime utcStruct;
   utcStruct.year = year;
   utcStruct.mon = month;
   utcStruct.day = day;
   utcStruct.hour = hour;
   utcStruct.min = minute;
   utcStruct.sec = second;
   // Need to set day_of_week, day_of_year, etc. for StructToTime to potentially handle DST correctly,
   // although StructToTime primarily uses Y, M, D, H, M, S.
   // Let's get the day of week for reliability (requires a datetime value first):
   datetime tempTime = StringToTime(datePart + " 00:00:00"); // Use StringToTime for basic date parsing
   if (tempTime == 0) return 0;
   MqlDateTime tempStruct;
   TimeToStruct(tempTime, tempStruct);
   utcStruct.day_of_week = tempStruct.day_of_week;
   utcStruct.day_of_year = tempStruct.day_of_year;
   utcStruct.weds_in_month = tempStruct.weds_in_month;

   // Convert the UTC components to a datetime value *assuming these components are UTC*
   datetime utcTimeValue = StructToTime(utcStruct);

   // Now convert this UTC value to Server Time value
   // Server Time = UTC Time + (Server Time - GMT) + (GMT - UTC)
   // Server Time = UTC Time + ServerGMTOffset;  // ServerGMTOffset is TimeTradeServer() - TimeGMT()

   long serverGMTOffset = TimeTradeServer() - TimeGMT(); // Offset in seconds
   datetime serverTimeValue = utcTimeValue + serverGMTOffset;

   PrintFormat("UTC String: %s -> UTC Value (seconds): %d -> Server Value (seconds): %d -> Server Time: %s",
               utcString, utcTimeValue, serverTimeValue, TimeToString(serverTimeValue));
   return serverTimeValue;
}

// In OnStart:
// datetime serverTimeFromUTC = ParseStringWithOffset("2023-10-27 12:00:00"); // Assuming input is UTC
// print("Converted UTC 12:00:00 to Server Time: ", TimeToString(serverTimeFromUTC));

This demonstrates that handling time zones from arbitrary string formats requires manual parsing and conversion using StructToTime and calculating offsets, as StringToTime itself is timezone-ignorant in its parsing logic and assumes the literal input represents server time.

Adjusting for Server Time vs. Local Time

Most trading logic in MQL5 should be based on server time, as this is the time used for bar timestamps, tick arrival, and order execution records. StringToTime() converts to a datetime relative to the server’s epoch. If you need to display times in the user’s local time zone, you can use TimeToString(datetime_value, TIME_DATE|TIME_SECONDS|TIME_LOCAL) or manually adjust the server datetime by the difference between TimeLocal() and TimeTradeServer().

datetime serverTime = StringToTime("2023.10.27 15:30"); // This is Server Time

long serverLocalDifference = TimeLocal() - TimeTradeServer();
datetime localTime = serverTime + serverLocalDifference;

PrintFormat("Server time from string: %s", TimeToString(serverTime));
PrintFormat("Equivalent local time:   %s", TimeToString(localTime));
// Or directly format for local time output:
PrintFormat("Server time from string formatted as local: %s", TimeToString(serverTime, TIME_DATE|TIME_SECONDS|TIME_LOCAL));

Always be explicit about whether you are working with server time, local time, or UTC to avoid discrepancies, especially around Daylight Saving Time (DST) transitions, where the offset between local and server time can change.

Error Handling and Validation

Failed conversions are a common source of bugs. Robust code must anticipate and handle cases where StringToTime() cannot parse the input string.

Checking for Valid Datetime Strings Before Conversion

While you cannot perform a perfect validation without replicating StringToTime()‘s internal parsing logic, you can perform sanity checks on the input string:

Check String Length: Ensure the string is long enough to contain the expected date and time components.
Check for Expected Separators: Verify the presence of characters like ., /, -, :, and space in expected positions.
Basic Pattern Matching: Use StringFind() or iterate through the string to check if characters are digits where expected.

bool IsValidMyFormat(string inputString)
{
   // Simple check for YYYY.MM.DD HH:MM format
   if (StringLen(inputString) != 16) return false;
   if (StringSubstr(inputString, 4, 1) != '.') return false;
   if (StringSubstr(inputString, 7, 1) != '.') return false;
   if (StringSubstr(inputString, 10, 1) != ' ') return false;
   if (StringSubstr(inputString, 13, 1) != ':') return false;
   // Add more checks for digit characters in date/time positions if needed
   return true;
}

// In OnStart:
// string testString = "2023.10.27 15:30";
// if (IsValidMyFormat(testString)) {
//    datetime successTime = StringToTime(testString);
//    // ... process successTime
// } else {
//    Print("Invalid string format: ", testString);
// }

These pre-checks can prevent calling StringToTime() with fundamentally malformed strings, although they don’t guarantee StringToTime() will succeed (e.g., they won’t catch invalid dates like February 30th).

Handling Conversion Errors and Invalid Input

As mentioned, StringToTime() returns 0 on failure. This is the primary way to detect a conversion error. Note that 0 as a datetime value corresponds to January 1, 1970, 00:00, which is a valid date. However, in most practical scenarios involving recent data or events, a datetime of 0 indicates failure.

string potentialTimeString = "invalid-date-format";
datetime convertedTime = StringToTime(potentialTimeString);

if (convertedTime == 0)
{
   // Conversion failed
   Print("Failed to convert string to datetime: ", potentialTimeString);
   // Handle the error: skip this data point, log the error, alert the user, etc.
} else {
   // Conversion successful
   Print("Successfully converted string: ", potentialTimeString, " to datetime: ", TimeToString(convertedTime));
   // Proceed with using convertedTime
}

It’s good practice to always check the return value of StringToTime() before attempting to use the resulting datetime value.

Best Practices for Robust Datetime Parsing

Document Expected Formats: Clearly define and document the expected string format(s) for any external data or user input your code parses.
Use Consistent Formats: If you have control over the source of the string data, enforce a consistent, unambiguous format that StringToTime() reliably handles.
Validate Input: Implement checks (like length and separator checks) before calling StringToTime() to filter out obviously wrong inputs.
Always Check Return Value: Treat StringToTime() returning 0 as a conversion error and implement appropriate error handling logic.
Consider Time Zones Explicitly: If your application involves data from different time zones, manually parse components and use StructToTime() and offset calculations for accurate conversion to server time.
Log Failures: Log invalid strings or conversion failures to help diagnose issues with input data.

By following these practices, you can make your MQL5 applications more reliable when dealing with string representations of time.

Advanced Techniques and Use Cases

While StringToTime() covers common scenarios, some situations require more advanced handling or combining it with other MQL5 features.

Converting Strings with Milliseconds or Microseconds

The MQL5 datetime type has a resolution of one second. StringToTime() cannot parse millisecond or microsecond components from a string (e.g., “2023.10.27 15:30:45.123”). If you need higher precision timestamps, you must:

Parse the date and time string up to seconds using StringToTime().
Manually parse the millisecond/microsecond part from the string.
Store the result as a datetime (for seconds) and a separate int or long variable for the sub-second part.

struct HighPrecisionTime
{
   datetime seconds;
   int milliseconds; // or long microseconds;
};

HighPrecisionTime ParseHighPrecisionTime(string inputString)
{
   HighPrecisionTime hpt = {0, 0};
   int dotPos = StringFind(inputString, '.');

   string secPart = inputString;
   string msPart = "0";

   if (dotPos > 0)
   {
      secPart = StringSubstr(inputString, 0, dotPos);
      msPart = StringSubstr(inputString, dotPos + 1);
      // Truncate or pad msPart to 3 digits if necessary
      if (StringLen(msPart) > 3) msPart = StringSubstr(msPart, 0, 3);
      while (StringLen(msPart) < 3) msPart += "0";
   }

   hpt.seconds = StringToTime(secPart);
   hpt.milliseconds = (int)StringToInteger(msPart);

   return hpt;
}

// In OnStart:
// string preciseString = "2023.10.27 15:30:45.123";
// HighPrecisionTime hptValue = ParseHighPrecisionTime(preciseString);
// if (hptValue.seconds > 0)
// {
//    PrintFormat("Parsed Time: %s.%03d", TimeToString(hptValue.seconds, TIME_DATE|TIME_SECONDS), hptValue.milliseconds);
// }

This approach requires managing two variables for a single timestamp, but it’s necessary if sub-second precision from external data is required.

Combining String Conversion with Other MQL5 Time Functions

StringToTime() is often used in conjunction with other time-related functions:

TimeToStruct(): Convert the datetime result into an MqlDateTime structure to access individual components (year, month, day, hour, etc.) for detailed analysis or manipulation.
StructToTime(): Useful for converting strings with complex or non-standard formats by manually parsing components and then constructing the datetime value from the MqlDateTime structure.
TimeToString(): The inverse function, used for displaying the converted datetime value in a human-readable string format (often for logging or debugging).
Comparison Operators: Comparing the datetime value obtained from a string with TimeCurrent(), bar timestamps (iTime()), or other datetime variables.

string targetTimeString = "2023.11.15 08:00";
datetime targetTime = StringToTime(targetTimeString);

if (targetTime > 0)
{
   if (TimeCurrent() >= targetTime)
   {
      Print("Target time reached or passed.");
      // Execute logic scheduled for this time
   }

   MqlDateTime targetStruct;
   TimeToStruct(targetTime, targetStruct);
   PrintFormat("Target time structure: Year=%d, Month=%d, Day=%d, Hour=%d",
               targetStruct.year, targetStruct.mon, targetStruct.day, targetStruct.hour);
}

These functions allow you to fully integrate string-based time data into MQL5’s time management system.

Use Cases: Converting from External Data Sources and Files

A common application for StringToTime() is parsing data read from external sources:

CSV Files: Reading historical data, news releases with timestamps, or trading signals from CSV files where each line contains a date and time string field.
Log Files: Parsing timestamps from custom log files generated by other applications.
Web Requests: Processing data obtained via WebRequest() where timestamps are part of the JSON or XML response.

In these scenarios, you would read the string data line by line or field by field, extract the timestamp string, and use StringToTime() (potentially with pre-processing or manual parsing for complex formats) to convert it into a usable datetime value for analysis, backtesting, or execution logic.

Robust error handling during the parsing loop is essential, as external data sources can easily contain malformed or missing timestamps.

Converting strings to datetime is a fundamental skill in MQL5 development, enabling the integration of external time-sensitive information and precise time-based control within Expert Advisors, indicators, and scripts.

Risk Warning

Code example is for educational purposes only and is not financial advice. Automated trading carries substantial risk of loss. Test thoroughly in a demo environment before considering live implementation. Past performance does not guarantee future results. Trade at your own risk and never risk more than you can afford to lose.