Google格式的日期与格式比较在Google Apps脚本中落后1天

Question

编写Google Apps脚本，以通过Google Tasks API（作为高级服务）查看任务，并检查其到期日期，以查看是否过期。 如果是，则应将其移至当天。

完成项目

我使用以下代码创建了此项目，以使Google任务保持最新状态：

保持Google任务更新

问题

当将当前日期与任务到期日进行比较时，任务到期日总是滞后一天。

研究

研究它，我发现它可能与夏时制有关，仅休息一小时就意味着两天的时间差。 我发现这个问题也有类似的问题，他们的解决方案是使用Session.getScriptTimeZone()正确设置时区。

但是，即使当我使用Session.getScriptTimeZone()设置时区时，它的任务的截止日期仍要晚一天。

编码

function checkOverdue(t) {
  var today = Utilities.formatDate(new Date(), "EST", "MM/dd/yyyy");
  //var today = new Date();
  var tasks = t;
  if (tasks.items) {
    for (var i = 0; i < tasks.items.length; i++) {
      var task = tasks.items[i];
      if (task.due) {
        var taskDue = Utilities.formatDate(new Date(task.due), "EST", "MM/dd/yyyy");
        Logger.log('"%s", Comparing "%s" to "%s"',
                 task.title, taskDue, today);
        if (taskDue.valueOf() < today.valueOf()) {
          Logger.log('Task with title "%s" is past due', task.title);
        }
      }
    }
  } else {
    Logger.log('No tasks found.');
  }
}

日志

[18-04-10 13:12:33:927 EDT] "Create Bio presentation", Comparing "04/09/2018" to "04/10/2018"
[18-04-10 13:12:33:928 EDT] Task with title "Create Bio presentation" is past due
[18-04-10 13:12:33:929 EDT] "Bio Presentation", Comparing "04/10/2018" to "04/10/2018"
[18-04-10 13:12:33:930 EDT] "Matrix HW", Comparing "04/09/2018" to "04/10/2018"
[18-04-10 13:12:33:930 EDT] Task with title "Matrix HW" is past due

---

=== [更新] ===

我注意到，如果我记录原始task.due ，则该日期似乎正确。 因此，有关格式的某些事情正在更改日期。

新密码

function checkOverdue(t) {
  var today = Utilities.formatDate(new Date(), "EST", "MM/dd/yyyy");
  //var today = new Date();
  var tasks = t;
  if (tasks.items) {
    for (var i = 0; i < tasks.items.length; i++) {
      var task = tasks.items[i];
      if (task.due) {
        var taskDue = Utilities.formatDate(new Date(task.due), "EST", "MM/dd/yyyy");
        Logger.log('"%s", Comparing TaskDue: "%s" to today: "%s", task.due "%s"', task.title, taskDue, today, task.due);
        if (taskDue.valueOf() < today.valueOf()) {
          Logger.log('Task with title "%s" is past due', task.title);
        }
      }
    }
  } else {
    Logger.log('No tasks found.');
  }
}

新日志

[18-04-10 14:15:17:628 EDT] "Create Bio presentation", Comparing TaskDue: "04/09/2018" to today: "04/10/2018", task.due "2018-04-10T00:00:00.000Z"
[18-04-10 14:15:17:629 EDT] Task with title "Create Bio presentation" is past due
[18-04-10 14:15:17:630 EDT] "Bio Presentation", Comparing TaskDue: "04/10/2018" to today: "04/10/2018", task.due "2018-04-11T00:00:00.000Z"
[18-04-10 14:15:17:631 EDT] "Matrix HW", Comparing TaskDue: "04/09/2018" to today: "04/10/2018", task.due "2018-04-10T00:00:00.000Z"
[18-04-10 14:15:17:631 EDT] Task with title "Matrix HW" is past due

---

=== [更新2] ===

将formatDate中的"EST"都更改为Session.getScriptTimeZone()

删除了.valueOf()以进行比较。

仍然导致相同的问题

新密码

function checkOverdue(t) {
  var today = Utilities.formatDate(new Date(), Session.getScriptTimeZone(), "MM/dd/yyyy");
  //var today = new Date();
  var tasks = t;
  if (tasks.items) {
    for (var i = 0; i < tasks.items.length; i++) {
      var task = tasks.items[i];
      if (task.due) {
        var taskDue = Utilities.formatDate(new Date(task.due), Session.getScriptTimeZone(), "MM/dd/yyyy");
        Logger.log('"%s", Comparing TaskDue: "%s" to today: "%s", task.due "%s"', task.title, taskDue, today, task.due);
        if (taskDue < today) {
          Logger.log('Task with title "%s" is past due', task.title);
        }
      }
    }
  } else {
    Logger.log('No tasks found.');
  }
}

新日志

[18-04-10 15:21:01:988 EDT] "Create Bio presentation", Comparing TaskDue: "04/09/2018" to today: "04/10/2018", task.due "2018-04-10T00:00:00.000Z"
[18-04-10 15:21:01:988 EDT] Task with title "Create Bio presentation" is past due
[18-04-10 15:21:01:990 EDT] "Bio Presentation", Comparing TaskDue: "04/10/2018" to today: "04/10/2018", task.due "2018-04-11T00:00:00.000Z"
[18-04-10 15:21:01:991 EDT] "Matrix HW", Comparing TaskDue: "04/09/2018" to today: "04/10/2018", task.due "2018-04-10T00:00:00.000Z"
[18-04-10 15:21:01:991 EDT] Task with title "Matrix HW" is past due

Answer 1

根据Google Tasks API文档， task#due属性是RFC 3339日期时间值，例如"2018-04-11T0:45:26.000Z" 。 从这个字符串，您可以本地构造一个Javascript Date ，即

var taskDueDate = new Date(task.due);

请注意，这等效于调用Date.parse() ，因此，鉴于Google Apps脚本是Javascript 1.6（即非ES5 +），因此日期比较失败的原因。 假设您知道从task.due获得的严格的特定格式，那么使用自定义解析器可能是更好的方法。 此答案中有一个这样的解析器。

如@Serge所述 ，您应该使用本机Date对象而不是Strings进行此比较：

function isOverdue(task) {
  if(!task.due)
    return false;

  var now = new Date();
  var endOfToday = new Date(Date.UTC(now.getUTCFullYear(), now.getUTCMonth(), now.getUTCDate() + 1)); // Also known as start of tomorrow ;)
  var taskDueDate = myFunctionToConvertRFC3339StringToJSDate(task.due);
  return taskDueDate < endOfToday;
}

Answer 2

对于信息，这是一个小代码，用于将RFC339时间转换为日期对象。 我发现它更容易阅读和理解。

function parseDate_RFC3339(string) {
  var refStr = new Date().toString();
  Logger.log('refStr = '+refStr);
  var tzOffset = Number(refStr.substr(refStr.indexOf('GMT')+4,2));
  Logger.log('TZ offset = '+tzOffset);
  var parts = string.split('T');
  parts[0] = parts[0].replace(/-/g, '/');
  var t = parts[1].split(':');
  return new Date(new Date(parts[0]).setHours(+t[0]+tzOffset,+t[1],0));
}