Been getting a slew of  these errors all the sudden from the calendar  it appears the ip is from poland or russia or turkey, is this some sort of exploit expedition?

#3L182/3

The date you requested appears to be invalid

Error triggered by: Guest (85.159.69.194)
05/15/2017 in Calendar

 

I do not think that it is an exploit expedition. This is an error that has to do with the date input by looks of it.