Shoreshthe drift report · all case files
Case file

Islamic calendar

In 2005 Wikipedia's first sentence called it “calendar used to date events in predominately muslim countries”. Today it says “lunar calendar consisting of 12 lunar months in a year of 354 or 355 days”.
Measured, not asserted. Every count, date and revision on this page was taken from Wikipedia's own history and checked against the live article. The words quoted are theirs.
Machine-checked against the full current article on 2026-08-03.
We saved snapshots of this article over twenty years; you are reading the 2005 one. Red dashes: removed from Wikipedia since. Pale dots: rewritten; the numbered note shows what it says now. 1 tap a number or a side note to jump between them
The opening as it read in 2005

Islamic calendar or Muslim calendar (also called 'Hijri calendar') is the calendar used to date events in predominately Muslim countries, and used by Muslims everywhere to determine the proper day on which to celebrate Muslim holy days.1 It is a purely lunar calendar having 12 lunar months in a year of about 354 days. Because this lunar year is about 11 days shorter than the solar year, Muslim holy days, although celebrated on fixed dates in their own calendar, usually occur 11 days earlier each successive solar year, such as a year of the Gregorian calendar . Islamic years are also called Hijra years because the first year was the year during which the Hijra occurred— Muhammad 's emigration from Mecca to Medina .2 Thus each numbered year is designated either H or AH, the latter being the initials of the Latin anno Hegirae (in the year of the Hijra).3

This is Wikipedia's own text, saved in our repository. Their copy of it is revision 15912343.
Today
In 2005 Wikipedia's first sentence called it “calendar used to date events in predominately muslim countries”. Today it says “lunar calendar consisting of 12 lunar months in a year of 354 or 355 days”. Read the current article and compare.
2005201020152020Oct '232025
Counts in the opening at each snapshot. Green: the word gained ground. Red: it was cut. Grey: no change.

What Wikipedia says this is

Every article opens by defining its subject. This one was redefined since 2005, and today's defining sentence is their current revision.

Then

calendar used to date events in predominately muslim countries

Now

lunar calendar consisting of 12 lunar months in a year of 354 or 355 days

Struck red text is no longer in the article; dotted amber text was rewritten. Every revision id links to Wikipedia's copy; the text shown is our own saved copy. Data: /data. Wikipedia text is CC BY-SA; quoted for the record; not affiliated with Wikipedia.

← back to the drift report