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Prevent JavaScript `new Date()` off-by-one date errors caused by UTC parsing by using explicit components.

Prevent JavaScript `new Date()` off-by-one date errors caused by UTC parsing by using explicit components.

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11 min read
The holiday list is free. The date math is the product.

The holiday list is free. The date math is the product.

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5 min read
February 29 Needs a Policy Parameter, Not a Hidden Exception

February 29 Needs a Policy Parameter, Not a Hidden Exception

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4 min read
Date Differences Without Traps: Calendar Days, UTC, Midnight, and DST

Date Differences Without Traps: Calendar Days, UTC, Midnight, and DST

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5 min read
My XLSX converter shipped dates as five-digit numbers — Excel stores dates as serials, not values

My XLSX converter shipped dates as five-digit numbers — Excel stores dates as serials, not values

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2 min read
Your Trade Is on the Wrong Day: It’s a Type Error, Not a Timezone Bug

Your Trade Is on the Wrong Day: It’s a Type Error, Not a Timezone Bug

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6 min read
My XLSX converter shipped a due date as 45852 — Excel dates are serial numbers, not strings

My XLSX converter shipped a due date as 45852 — Excel dates are serial numbers, not strings

1
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2 min read
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