First, let's take a look at job postings for the last 5 years. Notice the obvious cycle:
Let's zoom in on posting dates for 2018-2019. FYI: 14 posts didn't fill in the "deadline" field. I guess is was in the body of the post? Annoying...
Now let's take a look at when job apps are due.
November 1..... 31
November 15... 22
December 1...... 12
March 1............. 10
October 15........ 9
January 15........ 9
You get some downtime in the summer: mid-June to early July tends to be pretty chill.
Are there differences by job type?
One more question: how much time to applicants get between the day the job is posted and the deadline?
For postdoc positions, the shortest time between the posting and the deadline is 3 days, but most are between 34 and 65, with a median of 48. But postdoc postings have more dispersed outliers.
So there you have it. Some interesting findings about last year's job market. As always, feedback is welcome, especially if there's other analyses you'd like done.