since day 1 vs from day 1

Both 'since day 1' and 'from day 1' are correct and are commonly used phrases in English. They're interchangeable and convey the same meaning of something that's been true or consistent since the beginning.

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Editor at TextRanch

Last updated: March 16, 2025 • 5290 views

This phrase is correct and commonly used in English.

"since day 1"

This phrase is used to indicate that something has been true or consistent since the very beginning of a period or situation.

Examples:

I've known her since day 1 of the project.
He's been a loyal friend since day 1.

Show examples from the web [+]

He's been gunning for Freddie since day 1.
Display the value of the selected cell(s) in Date format. The value is taken as the number of days since 1 January 1900.
Among subjects with an abnormal Pap test at Day 1 who were already infected with the relevant vaccine HPV types at Day 1, no vaccine efficacy was observed.
Since you've been on the wedding bandwagon since day one.
I've known it since day one.
Emery has been our biggest supporter since day one.
I have been the church's musical director since day one.
I've had this thing for my roommate since day one.
Showed up at every open mike night since day one.
It has been madness since day one.
I've followed Alexandre since day one.
She's had my back since day one.
You've been with this boy since day one.
You've been suspicious of dad since day one.
Since day one... you and Rachel fought over solos for three years.
Clarence has championed you since day one.
Leon's been Veronica's lawyer since day one.
Alec and I were together since day one of college.
You've been after that boat since day one.
Been on me since day one.

Alternatives:

from the beginning
since the start
since the outset
since the commencement
since the inception

This phrase is correct and commonly used in English.

"from day 1"

This phrase is used to indicate that something has been true or consistent since the very beginning of a period or situation.

Examples:

We've been working on this project from day 1.
She's been a dedicated employee from day 1.

Show examples from the web [+]

Administration in combination with an aromatase inhibitor In the pivotal trial Herceptin and anastrozole were administered from day 1.
Patients on the comparator arm received cisplatin (P) 100 mg/ m² as a 30-minute to three-hour intravenous infusion on day 1 followed by the continuous intravenous infusion of 5-fluorouracil (F) 1000 mg/ m²/ day from day 1 to day 5.
After intravenous administration of palonosetron 0.25 mg once daily for 3 days in 12 healthy subjects, the mean (± SD) increase in plasma palonosetron concentration from Day 1 to Day 3 was 110 ± 45%.
In addition, signs of lethargy and/or unresponsiveness and any clinical signs of more than slight or momentary pain and distress, or a > 5 % reduction in body weight from Day 1 to Day 8 and mortality, should be considered in the evaluation.
Dose From day 1 to day 3, you should take one white CHAMPIX 0.5 mg film-coated tablet once a day.
The usual dose for adults which you should follow from Day 1 is described in the following table:
Said it from day 1.
If a person's been deaf their whole life from day 1 to now, their life is just as normal as yours and ours.
The withdrawal period will expire after 14 days from the day 1
The corpses I restore last from 2O days to 1 month without a smell.
It's just a couple hours a day from 1:00 to 3:00.
Therefore, the Commission will just handle day-to-day business from November 1.
· The graduated increase in days checked from 1 % to 3 % and ultimately 4 % would seem perfectly sensible.
three working days from 1 January 2014 until 31 December 2014;
- that the defendant be ordered to pay interest of EUR 9,62 per day from 1 February 2005 until full satisfaction of the debt, and
Cumulative amount of fishing effort expressed in kilowatt days deployed from 1 February until 31 January of the relevant management period
A study on Rhesus-monkeys that were exposed to anthrax by inhalation revealed that 8/ 9 animals survived the experiment when these animals were treated from 1 day after anthrax exposure with ciprofloxacin twice daily for a period of 30 days.
(c) the C sugar or the C isoglucose or a corresponding quantity within the meaning of Article 2 (3) left the customs territory of the Community at the latest within 60 days from 1 January referred to under (b);
The minimum number of checks to be carried out in the Member States shall be set at at least 2% of the total of days worked from 1 January 2007, 3% from 1 January 2009 and 4% from 1 January 2011.
Ryanair committed itself in this Agreement to pay for a minimum of [...] routes per day as from 1 July 2009, even if it operated fewer routes in the period from 1 July 2009 to 30 June 2016.

Alternatives:

since the beginning
since the start
since the outset
since the commencement
since the inception

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since day 1 vs from day 1

"since day 1"

"from day 1"

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