How can I store two digit month in Firebase using Java?

Question

I've now tried a couple of different methods to get the format I want in my Firebase Database:

I use the java.util.Calendar import in Android Studio.

Method 1:

if (endMonth <= 9) {
    endYear = endYear * 10;
    endDate = Integer.toString(endYear) + Integer.toString(endMonth) + Integer.toString(endDay);
}

Method 2:

if (endMonth <= 9) {
    endDate = Integer.toString(endYear * 10) + Integer.toString(endMonth) + Integer.toString(endDay);
}

Method 3:

if (endMonth <= 9) {
    endDate = Integer.toString(endYear) + "0" + Integer.toString(endMonth) + Integer.toString(endDay);
}

I have also tried to store methods 1 and 2 as integers. However, they all end up in the Firebase Database as "2022328" or equivalent, whereas I want it to store as "20220328".

Is the problem converting the string value locally before your store it? or the value looks fine on device but changes after your store it? — MehranB, Apr 28 '22 at 02:21
@AlexMamo I've tried to find a forum post describing how to format java.util.Calendar, but I've only found forum posts about java.util.date, which I unfortunately can't use for my purpose — DJ Feder, Apr 28 '22 at 23:10

score 0 · Accepted Answer · answered Apr 28 '22 at 22:25

0

I recommend using SimpleDateFormat for that.

SimpleDateFormat formatter = new SimpleDateFormat("yyyyMMdd");
String stringDate = formatter.format(date);

Also see:

Calendar date to yyyy-MM-dd format in java

answered Apr 28 '22 at 22:25

Frank van Puffelen

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Thank You! Your link helped out alot!! Have a great weekend ^-^ – DJ Feder Apr 28 '22 at 23:29
Consider throwing away the long outmoded and notoriously troublesome `SimpleDateFormat` and friends. Use [desugaring](https://developer.android.com/studio/write/java8-support-table) in order to use [java.time, the modern Java date and time API](https://docs.oracle.com/javase/tutorial/datetime/). It is so much nicer to work with. – Ole V.V. Apr 29 '22 at 04:12

score 0 · Answer 2 · answered Apr 28 '22 at 22:32

0

You can format your date using SimpleDateFormatter:

Using Java:

Date date = Calendar.getInstance().getTime() // Today's date
String formattedDate = SimpleDateFormat("yyyyMMdd",Locale.getDefault()).format(date);

Using Kotlin:

val date = Calendar.getInstance().time // Today's date
val formattedDate = SimpleDateFormat("yyyyMMdd", Locale.getDefault()).format(date);

answered Apr 28 '22 at 22:32

Izak

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9
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Is it possible to make this work, when calculating the date the next day? I'm not sure how to do it when using the Date. – DJ Feder Apr 28 '22 at 23:21
@DJFeder It’s easy, but then you will need to switch to java.time as mentioned in my comment under the other answer. You may for instance define `LocalDate currentDay = LocalDate.now(ZoneId.systemDefault());` and then `LocalDate nextDay = currentDay.plusDays(1);`. The format you ask for is built in, so formatting goes like `String endDate = nextDay.format(DateTimeFormatter.BASIC_ISO_DATE);`. – Ole V.V. Apr 29 '22 at 06:11

How can I store two digit month in Firebase using Java?

2 Answers2