Last week I wrote about trying to find ways to manage time and work while recovering from health problems. That's definitely an example of situational time management. With any luck, for most of us health problems are a temporary situation that we have to work through like so many other changing situations in our work lives.
This past week at Writer Unboxed, Lydia Sharp described another situation to work through, one that occurs with more frequency, writing with seasonal affective disorder. There are times of the year--situations--when she is able to work better than at others. For her, the year is broken into quarters. She has a quarter when she is most likely to be able to generate new work and a quarter when it's best to revise.
If you read Sharp's post and the comments that follow it, you'll see that she and some others manage their writing time by recognizing that their situation will change over the course of the year and planning what they'll do during the different seasonal situations. One writer even determines whether she'll work on fiction or nonfiction by time of year.
Notice, also, the impact of the "write-every-day" and "Butt in Chair" philosophies on people who are trying to manage writing time while dealing with this type of situation. Not only are they not helpful, they often lead writers who just can't work that way to feel guilty.