What does Start of Year do that other Date & time pages on this site do not?

Returns Jan 1 of the date’s year plus weekday and year number. Local YMD only. Short version: January 1 with weekday and year.

Does Start of Year upload my file or text to Tool-You servers?

No. Start of Year runs in this browser tab. Files stay on the device. Limit note: Local calendar. Weekday is English short form.

Should I use End of Year instead of Start of Year?

Use Start of Year when you need January 1 with weekday and year. Use End of Year when you need December 31 with weekday and year. They share a category (Date & time) but not the same job.

What are the limits of Start of Year?

Local calendar. Weekday is English short form. Also: Returns Jan 1 of the date’s year plus weekday and year number. Local YMD only.

Start of Year

January 1 with weekday and year.

Returns Jan 1 of the date’s year plus weekday and year number. Local YMD only.

What Start of Year does

Returns Jan 1 of the date’s year plus weekday and year number. Local YMD only.

Practical limit for Start of Year: Local calendar. Weekday is English short form. That is why output can differ from heavy desktop Date & time software. Read the tool-specific note again: Returns Jan 1 of the date’s year plus weekday and year number. Local YMD only.

How to use Start of Year

Confirm you need Start of Year, not End of Year (December 31 with weekday and year.). Address: /datetime/start-of-year.
Enter the numbers or dates Start of Year uses. January 1 with weekday and year.
Read the result as Start of Year defines it — not as Start of Month (First day of the month plus weekday.). Returns Jan 1 of the date’s year plus weekday and year number. Local YMD only.
Start of Year is an estimate in the browser, not professional advice. Local calendar. Weekday is English short form.
Need a different formula? Try Start of Month (First day of the month plus weekday.) instead of stretching Start of Year.

When not to use Start of Year

Skip Start of Year when a neighbor tool matches better — start with End of Year or Start of Month — or when the description already warns the job will fail. In the tool’s own words: Returns Jan 1 of the date’s year plus weekday and year number. Local YMD only.

Questions about Start of Year

What does Start of Year do that other Date & time pages on this site do not?: Returns Jan 1 of the date’s year plus weekday and year number. Local YMD only. Short version: January 1 with weekday and year.
Does Start of Year upload my file or text to Tool-You servers?: No. Start of Year runs in this browser tab. Files stay on the device. Limit note: Local calendar. Weekday is English short form.
Should I use End of Year instead of Start of Year?: Use Start of Year when you need January 1 with weekday and year. Use End of Year when you need December 31 with weekday and year. They share a category (Date & time) but not the same job.
What are the limits of Start of Year?: Local calendar. Weekday is English short form. Also: Returns Jan 1 of the date’s year plus weekday and year number. Local YMD only.