CODEWITHSUNDEEP
firebaseflutterdartgoogle-cloud-firestore
Param B.
Param B.

Reputation: 95

How to check if the device's time is between two times in Flutter from Firebase/Firestore?

In the Firestore project, I have documents in a collection containing data for shops, having fields like shopName, shopAddress, startTime(eg. 10 AM) and closeTime(eg. 10 PM) . (all strings for now)

When the user is browsing the app, i have retrieved the data from Firestore of the shops displayed in the app, now i wanna show that the shop is closed when the device's time is not between the startTime and closeTime of the shop. How do i achieve this?

So far I can detect the device's current time using dart package intl using this code:

print("${DateFormat('j').format(DateTime.now())}");

It gives output as follows: I/flutter (14877): 6 PM

This is in DateFormat, and the data types stored in Firestore are strings.. I dont know how to compare them.. Do let me know if i have to change the data types in Firestore too.

Thank You

Upvotes: 1

Views: 718

Answers (2)

Ovidiu Uşvat
Ovidiu Uşvat

Reputation: 823

Maybe you can create a hash map like this: hashMap=['12 AM', '1 AM', '2 AM', ... , '11 PM', '12 AM']; After that you can get the positions of startTime, closeTime and actualTime, and see if the actualTime is between start and close times positions.

Let me know if you want to give you a code example.

Upvotes: 2

Ferenc Orosi
Ferenc Orosi

Reputation: 265

I think if you use 24 Hour Time Format and convert startTime, closeTime and actualTime to int or double ( if the shop close at 20:30/8:30pm), then you can easily compare them with if. On your firebase server string format is perfect.

For example you make a map and iterate it, and check if the actualTime is higher than startTime and lower than closeTime.

I have never tried this code, but i think it is going to work.

Map map = {'1am': 1, '2am': 2, '3am': 3, ... , '11pm': 23};
map.entries.forEach((e) {
  if(e.key == actualTime) {
    if(e.value >= startTime && e.value < closeTime) {
      print('Open');
    }
    else{
      print('Closed');
    }
  }
});

By the way, I think you should use UTC, because if you change the time-zone on your device, your app is going to show that the shop is closed, but in fact the shop is open, just you are in a different time-zone. You can easily implement this with this code.

var now = DateTime.now().toUtc();

Upvotes: 2

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