"in weekends" is correct and usable in written English.
It is an informal way to say "on weekends". Example sentence: I like to stay up late and sleep in during weekends.
GETTING IN Weekends become jammed, but most nights you can just trot downstairs to grab a spot at the bar.
But "Puss in Boots," which cost about $130 million to make and was distributed by Paramount Pictures, received strong critical reviews and an A-minus from audiences in exit polls, opening up the possibility of solid sales in weekends ahead.
Facilities such as museums usually keep records of their visitors and this enables, for example, the study of museum visits in weekends (Harvey and Pentland [1999]).
Regarding these preferences, the preferences of nurse 7 to be off in weekends 1 through 4 are low, high, high, and medium, respectively.
For instance, regarding the parameters ( f_{i,t} ) and ( p_{{i,{text{j}},t}} ) generated in Table 3, the preferences of nurse 7 to be off in weekends 1, 2, 3, and 4 are 1, 7, 7, and 3, respectively.
It is obvious that the spot market prices are higher in weekdays than in weekends, and the maximum capacities of BESS used in weekday and weekend are about 4 MWh (red line in Fig. 9) and 1.1 MWh (red line in Fig. 11) separately.
