t sql: get the maximum, minimum and average value within each 1 day interval on the sql server

I want to select the maximum, minimum and average value within each 1 day range.

My table looks like this:

+-------+---------------------+
| Value |      TimeStamp      |
+-------+---------------------+
| 31.20 | 2019-04-20 20:02:51 |
| 31.00 | 2019-04-20 20:17:33 |
| 31.00 | 2019-04-21 20:32:15 |
| 30.70 | 2019-04-21 20:46:58 |
| 30.50 | 2019-04-21 21:01:40 |
| 30.50 | 2019-04-24 21:16:22 |
| 30.20 | 2019-04-24 21:31:04 |
| 30.20 | 2019-04-26 21:45:47 |
| 30.00 | 2019-04-26 22:00:29 |
| 29.70 | 2019-04-26 22:15:11 |
+-------+---------------------+

I want to select the maximum, minimum, average value within each 1 day range of 2019-04-20 to 2019-04-25.

I want my output (for the average value) to be like this:

+-------+---------------------+
| Value |      TimeStamp      |
+-------+---------------------+
| 31.10 | 2019-04-20 00:00:00 |
| 30.73 | 2019-04-21 00:00:00 |
| 0     | 2019-04-22 00:00:00 |
| 0     | 2019-04-23 00:00:00 |
| 30.35 | 2019-04-24 00:00:00 |
| 0     | 2019-04-25 00:00:00 |
+-------+---------------------+

And I used the query below:

SELECT AVG(Value) AS Value,
       DATEADD(day, DATEDIFF(day, 0, timestamp), 0) AS TimeStamp 
FROM MyTable
GROUP BY DATEADD(day, DATEDIFF(day, 0, timestamp), 0)

But what I received like this:

+-------+---------------------+
| Value |      TimeStamp      |
+-------+---------------------+
| 31.10 | 2019-04-20 00:00:00 |
| 30.73 | 2019-04-21 00:00:00 |
| 30.35 | 2019-04-24 00:00:00 |
+-------+---------------------+

Missing rows in TimeStamp: 2019-04-22 , 2019-04-23 Y 2019-04-25

How do I solve that?

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