Yes, it is safe to take 60 ml.
No
Today is Monday, May 19, 2014. If you subtract 27 weeks from today's date, or 189 days, the date would be Monday, November 11, 2013.
Gd
From the 10th of November, 2013, when the question was asked, the date six weeks after is the 22nd of December 2013.
Tuesday, July 9, 2013 is 26 weeks from today Tuesday, Jan 8, 2013.
October 19 2017
To find the date 79 weeks ago, you would subtract 79 weeks from the current date. If today is June 1, 2021, the date 79 weeks ago would be February 10, 2020.
Wednesday, November 8, 2017
Today's date is June 16th, 2014 counting back 33 weeks would be October 28th, 2013.
Today is Sunday 4 April 2010. 75 weeks from now, the date will be Sunday 11 September 2011.
This is a variable number. You need to state a start and/or end date or time.
As today is January 11, the date 28 weeks and 6 days ago would have been June 23.