AUTHOR'S NOTES -


CHAPTER 8: COMFORT AND KISSES
Frodo and Sam set off the day after, and arrived at Crickhollow in the late afternoon of the following day, having stopped overnight at the Floating Log in Frogmorton.
The Return of the King, The Scouring of the Shire: “As evening fell they were drawing near to Frogmorton, a village right on the Road, about twenty-two miles from the Bridge. There they meant to stay the night; The Floating Log at Frogmorton was a good inn.”

‘I had forgotten,’ said Frodo, ‘forgotten how this house reminded me of Bilbo.’ He walked from room to room, running his hands over furniture, touching keepsakes, breathing deeply to savour the smell of old books. He closed his eyes, then opened them again and sighed. He felt as though he was greeting old friends, but at the same time he was overwhelmed by a sense of loss. He saw Merry’s anxious face and smiled at him.

‘It’s delightful,’ he said.

Merry’s face lightened with relief. ‘That’s what you said last time.’
The Fellowship of the Ring, A Conspiracy Unmasked: “Frodo looked around. It did look like home. Many of his own favourite things - or Bilbo’s things (they reminded him sharply of him in their new setting) - were arranged as nearly as possible as they had been in Bag End...

‘It’s delightful,’ he said with an effort. ‘I hardly feel as though I have moved at all.’”

Work took Sam to the Northfarthing, and his brother, Hal, invited him to stay. Frodo was pleased and worked hard to persuade Sam that he would be fine. Sam planned his trip so he would be back for the all important (or so he thought) twenty-fifth of the month, but failed to notice that there was another anniversary looming. In his own mind, he did not even know what the date had been as he held Frodo in his arms in a dark tower on the borders of Mordor. The journey had seemed like a lifetime from there to Mount Doom, and he was too busy to stop and think that in reality it had been less than two weeks.
The Return of the King, Appendix C. The Longfather tree of Master Samwise shows his brother Hal “removed to the Northfarthing.” Appendix B shows the date of Shelob's attack on Frodo, and his capture by the orcs was the 13th of March (Rethe), while the destruction of the Ring took place on the 25th of March.

So he was not at home in early Rethe, and did not know that Frodo had been ill.
Apart for using the Shire name for March, this is a direct quote from The Return of the King, The Grey Havens.