I saw this sentence "Yesterday at this time, I was sitting at my desk at work." in this page
And then, I also saw this sentence "This time tomorrow I will be waiting at the doctor’s office." in this page
My question is that:
what are the difference between "at this time tomorrow / yesterday / next week..." and "this time tomorrow / yesterday / next week..."?
Are they the same?
In the dictionary,
time: [uncountable] the time shown on a clock in minutes and hours
The time is now half past ten
This time tomorrow I'll be in Canada.
at this time
(American English) at this particular moment
The president said his actions were ‘the right ones at this time’.
It seems like "at this time" is an idiom