My simple time zone check each morning saved my work week

I was constantly messing up client calls because I'd lose track of where I was versus their time, so I began setting a daily reminder to note all time differences before planning my day. It felt a bit silly at first, like why didn't I do this sooner, but after a week, I stopped having those panic moments before meetings. Now, I just glance at my phone in the morning, and my schedule makes way more sense. How do you keep time zones from tripping you up?