在Firestore中通过TimeStamp通过和传递项目以进行Swift

Question

我正在尝试在应用中的Firestore Timestamp中传递今天的日期。我今天是这样的日期

formatter.dateFormat = "MMMM d, yyyy"
let result = formatter.string(from: date)
print("Today date is \(result)")
let startDate = result + " " + "07:00:00"
let endDate = result + " " + "23:00:00"

我必须将上午7点到下午23:00之间的今天日期作为日期，并将此日期存储在startDate和endDate中。现在，我在Firestore查询中传递这些计时，如下所示：-

self.db.collection("Locations").whereField("userid", isEqualTo: "\(selectedUserID)").whereField("createddatetime", isGreaterThanOrEqualTo: "\(startDate)").whereField("createddatetime", isLessThanOrEqualTo: "\(endDate)").getDocuments()

但是我的快照没有任何结果。我怎样才能做到这一点。请帮忙吗？

Answer 1

您需要：

1）转换字符串->日期

2）转换日期->时间戳（FIRTimestamp）

formatter.dateFormat = "MMMM d, yyyy HH:mm:ss"

let startTime: Date = formatter.date(from: startDate) ?? Date(timeIntervalSince1970: 0)
let startTimestamp: Timestamp = Timestamp(date: startTime)

let endTime: Date = formatter.date(from: endDate) ?? Date()
let endTimestamp: Timestamp = Timestamp(date: endTime)

3）将功能更改为：

self.db.collection("Locations")
        .whereField("userid", isEqualTo: "\(selectedUserID)")
        .whereField("createddatetime", isGreaterThanOrEqualTo: startTimestamp)
        .whereField("createddatetime", isLessThanOrEqualTo: endTimestamp)
        .getDocuments() { (snapshot, error) in

        ...

}