API Exclude data if date is in the past - swift

Question

I am trying to exclude data from my API response if the nested list 'calls' contains past properties
Include this data in response:
[
{
"addressLineOne":"Test",
"addressLineTwo":"Test2",
"calls":{
"dateTime":1597932000, // a date in the future
},
]
Exclude this data:
[
{
"addressLineOne":"Test",
"addressLineTwo":"Test2",
"calls":{
"dateTime":1596193200 // a date in the past
},
]
I am using JSON decoder to make my api calls:
class Service {
static let shared = Service()
let BASE_URL = "url.com/JsonData"
func fetchClient(completion: #escaping ([Client]) -> ()) {
guard let url = URL(string: BASE_URL) else { return }
URLSession.shared.dataTask(with: url) { (data, response, error) in
// handle error
if let error = error {
print("Failed to fetch data with error: ", error.localizedDescription)
return
}
guard let data = data else {return}
do {
let clients = try JSONDecoder().decode([Client].self, from: data)
completion(clients)
} catch let error {
print("Failed to create JSON with error: ", error.localizedDescription)
}
}.resume()
}
}
Any direction would be much appreciated

Answer 1

Managed to solve it by adding a filter and using the built-in Calendar function to check the date:
class Service {
static let shared = Service()
let BASE_URL = "url.com/JsonData"
let calendar = Calendar.current
func fetchClient(completion: #escaping ([Client]) -> ()) {
guard let url = URL(string: BASE_URL) else { return }
URLSession.shared.dataTask(with: url) { (data, response, error) in
// handle error
if let error = error {
print("Failed to fetch data with error: ", error.localizedDescription)
return
}
guard let data = data else {return}
do {
let myDecoder = JSONDecoder()
myDecoder.dateDecodingStrategy = .secondsSince1970 // formats date
let clients = try myDecoder.decode([Client].self, from: data)
completion(clients.filter { self.calendar.isDateInToday($0.calls.dateTime) // filters dates upon completion
})
} catch let error {
print("Failed to create JSON with error: ", error.localizedDescription)
}
}.resume()
}
}
In my solution the API call completes before filtration, which is less-than-ideal as it means all data is downloaded prior to filtering, ideally i'd like the data to be filtered prior to download anyone who can point me in the right direction on achieving this is welcomed.
Also this solution only checks if the date is today, not if the date is in the future.