DateTime，字符串比较

DateTime, String comparison

本文关键字：比较 字符串 DateTime      更新时间：2023-10-16

我需要将传入字符串与DS1307 RTC模块的日期和时间进行比较。如果达到字符串的某个时间，我将触发事件。

我尝试使用转换为整数，但它不起作用。

String now_int = rtc.now();

错误说 conversion from DateTime to non-scalar type String is requested

如何将DateTime与字符串进行比较？

您可以使用sprintf和strcmp的组合来实现您所描述的行为，例如类似于此

// date and time from RTC
DateTime now = rtc.now();
// date and time to compare with - this is provided by you
String datetimeCompare = "1970/01/01 00:00:00";
// this buffer must be big enough for your complete datetime (depending on the format)
char datetimeBuffer[20] = "";
// convert current date and time to your specific format
sprintf(datetimeBuffer, "%04d/%02d/%02d %02d:%02d:%02d", now.year(), now.month(), now.day(), now.hour(), now.minute(), now.second());
// perform the comparison
if(strcmp(datetimeBuffer, datetimeCompare.c_str()) == 0)
{
    // datetime strings are the same
}

或您按照Arduino stackexchange所述的格式转换rtc.now（）dateTime。

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