By default, the format for your order numbers is based on the Unix timestamp, which is the number of seconds since the Unix Epoch (January 1 1970 00:00:00 GMT).
To change your order number format:
1. Open Store Settings
2. Change "Order Number Format" field
Change the "Order Number Format" field in the General Settings section from Random to Custom
3. Enter Next Order Number
Enter the order number that you want Squirrelcart to use for the next order. This number must be numerical, and cannot contain any special characters.
4. Enter Increment
Enter the amount that you would like to increment the order numbers by.
5. Click