How Can We Prevent Arithmetic Overflow Errors When Using DATEADD with Large Millisecond Values in SQL?

Overcoming Arithmetic Overflow Errors with DATEADD and Bigints

In utilizing SQL to convert JavaScript dates to SQL dates, intricacies arise when dealing with excessively large data, leading to arithmetic overflow exceptions. To address this issue, consider the following SQL statement:

DATEADD(MILLISECOND, cast(569337307200000 as bigint) % 1000, DATEADD(SECOND, cast(569337307200000 as bigint) / 1000, '19700101'))

Breaking down the DATEADD in two stages, starting with a larger time unit like minutes and then reducing to the desired milliseconds, circumvents the overflow issue. Avoid resorting to months or weeks as these involve calendar computations.

For instance, consider the calculation of a start time based on a large current duration in milliseconds:

-- two-step process to prevent overflow

-- subtract minutes (60000ms) as a first step

-- then subtract the remaining milliseconds

DATEADD(ms, -large_duration_ms%60000, DATEADD(minute, -large_duration_ms/60000, GETDATE()))

By breaking down the DATEADD into smaller steps, we can effectively handle large data values and resolve the arithmetic overflow error.

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