No Credit Card Required – 14 Day Free Trial. Divorced and separated parents can use SasiTime’s child custody calendar to help with co-parenting and joint custody time management. Our shared calendar software makes it easy to manage custody and visitation agreements between co-parents. Helping to make your blended family operate efficiently and peacefully, our family online calendar is a co-parenting tool meant to make divorced parenting easier. SasiTime’s collaborative parenting approach makes managing your kids’ calendar simple and hassle-free.