How to Avoid Arithmetic Overflow Errors When Using DATEADD with Large Bigints?

Overcoming Arithmetic Overflow in DATEADD with Bigints

Encountering arithmetic overflow errors when using DATEADD with large bigint values can be frustrating. To resolve this issue, a suitable workaround is to perform the DATEADD operation in multiple steps, starting with a coarser time unit like seconds or minutes.

As highlighted in an encountered error, directly adding too large a bigint value to a date expression can trigger an arithmetic overflow error. To overcome this, we can break down the operation into smaller steps:

1. Subtract larger time unit first: Determine the number of seconds or minutes contained in the bigint value using modulo calculations. Subtract this value from the date expression.
2. Add finer time unit: Use DATEADD to add the remaining milliseconds to the result obtained in step 1.

For example, to calculate a start time given a large current duration (milliseconds):

DECLARE @large_duration_ms BIGINT = 569337307200000;

-- Step 1: Subtract minutes (60000ms)
-- (a) Determine number of minutes
DECLARE @minutes_to_subtract BIGINT = @large_duration_ms / 60000;

-- (b) Subtract minutes
DECLARE @start_time_minutes DATETIME = DATEADD(MINUTE, -@minutes_to_subtract, GETDATE());

-- Step 2: Add remaining milliseconds
DECLARE @milli_seconds_to_add BIGINT = @large_duration_ms % 60000;
DECLARE @start_time_final DATETIME = DATEADD(MILLISECOND, @milli_seconds_to_add, @start_time_minutes);

SELECT @start_time_final;

By using this multi-step approach, we can avoid potential overflow errors and accurately calculate dates from large bigint values.

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