For each account you can define a starting balance and a date of initial balance.
The date of the initial balance corresponds to the date of commencement of use of that account and is referred to the initial balance. For proper use of MONEE, should not be included transaction prior to the date of the opening balance.
When you create a new account, the default date, is "today", if you want to insert transactions done in the past, then enter the oldest date of the transaction.
For example, when I start to use MONEE, I have $ 10 in the wallet and $ 1,000 in the bank, then I will set as the initial balance of the account Cash € 10, while that of the Bank account will be € 1,000, for both accounts the start date balance will be just "today", because I have decided that I will track only the expenses from now on.