1. A method, comprising: obtaining user provided information in consequence to any user operation on a mobile terminal device; obtaining context information associated with said user provided information, wherein said context information is related to at least one current condition of the mobile terminal device at the time of said any user operation and includes calendar information from an electronic calendar implemented at said mobile terminal device; obtaining a first time information in accordance with said user provided information; obtaining one or more calendar entries included in said calendar information, wherein each calendar entry comprises a second time information with a start time and an end time; comparing said first time information with each of said second time information to identify matching calendar entries by assigning a membership function to each of said second time information and deriving a membership grade value from each of said membership functions in accordance with said first period of time, wherein each membership function comprises a function in time, which rises from zero value at a predetermined moment in time before said start time of a respective calendar entry and becomes zero value at a predefined moment in time after said end time of said respective calendar entry, wherein each membership function defines an extended timeframe for a respective calendar entry; obtaining meta-information from each matching calendar entry of said one or more obtained calendar entries; assigning meta-information obtained from said context information and said membership grade value to said user provided information, said membership grade value defining a measure which allows estimation of a reliability of a timely relatedness for retrieval; and directing storage of said user provided information and said meta-information in a history storage in order to establish an information history functionality; wherein said meta-information is employable for retrieval of said user provided information by matching request information of a retrieval request with said meta-information for selecting a user provided information assigned to said meta-information matched to said request information.