DateTime(
DateTime.now().subtract(Duration(days:7)).year,
DateTime.now().subtract(Duration(days:7)).month,
DateTime.now().subtract(Duration(days:7)).day
)
DateTime(
DateTime.now().year,
DateTime.now().month,
DateTime.now().day).difference(
DateTime(
originDateTime.year,
originDateTime.month,
originDateTime.day)
).inDays