If your employer fails to keep good track of your time or to give you pay stubs that accurately reflect when you’ve worked and when your breaks were then, if there becomes a time when you believe you have not been paid overtime and you wish to make a claim, your recollection of when you worked, when your breaks were and how many hours you worked in the week may become the presumptive evidence of the case.
What that means is that your recollections when, unless your employer has records that prove that what you’re saying is wrong. Keeping your own records of when you’ve worked in your own calendar or even on your phone as a reminder to yourself of when you’ve worked, when your breaks were and how many total hours you’ve worked can be very helpful to you if you ever do have a claim for failure to pay overtime.