The Milyukov note, which reafirmed Russia's support for the Allies in WWI, was sent by Pavel Milyukov in early 1917, and led to massive protests (The April Crisis) and Milyukov's resignation from the Provisional Government cabinet. I am looking to find the date it was sent and the date the new socialist ministers joined the cabinet following Milyukov's resignation.
Wikipedia says the note was sent on April 20, but I'm not sure if this is an Old Style or New Style date. If it's Old Style what is the corresponding New Style date?
The English Wikipedia page seems to be wrong, as the German version links to a site which claims it was sent on the 18th of April old style, which was the first of May new style. It definitely wasn't sent on the 20th, as Tseretelli says in his memoirs that:
In the morning of April 20, Prince Lvov invited me to his house for a consultation. Nekrasov was with him. Both were greatly upset and expressed their amazement at the reaction of the Executive Committee to Miliukov's supplementary note and its interpretation as a hostile act.
Rex Wade's The Russian Revolution, 1917 also says that it was sent on the 18th.
The new ministers joined the government on May 5, this would be May 18 new style.