How to query a Firestore collection for documents added today

First we get today's date using new Date(). Then we set it to midnight of today and convert it to a timestamp.

Note: I had to add +5 hours to get midnight in Eastern Time.

function getStartOfToday() {
  const now = new Date();
  now.setHours(5, 0, 0, 0); // +5 hours for Eastern Time
  const timestamp = admin.firestore.Timestamp.fromDate(now);
  return timestamp;
}

As you can see below, with the getStartOfToday function we can run a Firestore query and ask for all documents that have a Timestamp greater than the beginning of today. This will return only the documents that have a timestamp from today assuming your date field is of type Timestamp. Woot! 🎊

const snapshot = await admin.firestore().collection('notes').where('date', '>', getStartOfToday()).get();
const notes = snapshot.docs.map((doc) => doc.data());

Check out the full snippet below:

function getStartOfToday() {
  const now = new Date();
  now.setHours(0, 0, 0, 0); // +5 hours for Eastern Time
  const timestamp = admin.firestore.Timestamp.fromDate(now);
  return timestamp;
}

const snapshot = await admin.firestore().collection('notes').where('date', '>', getStartOfToday()).get();
const notes = snapshot.docs.map((doc) => doc.data());