BY DAY

Afrikaans

bedags (during the day, in the daytime). (various references)

Albanian

ditën (in the daytime). (various references)

Bulgarian 

денем (daytime). (various references)

Chinese 

日趨 (day by day, gradually), 日益 (day by day, increasingly, more and more, more and more with each passing day), 日漸 (day by day). (various references)

Czech

ve dne. (various references)

Dutch

overdag (during the day, in the daytime). (various references)

Esperanto

tage (daily, in the daytime), dumtage (during the day). (various references)

Faeroese

um dagin (during the day, in the daytime). (various references)

Finnish

päivisin (in the daytime), päivineen (in the daytime), päivällä (in the day-time). (various references)

French

de jour. (various references)

Frisian

daagliks (daily, during the day, in the daytime). (various references)

German

tags (in the daytime). (various references)

Greek 

κατά την ημέρα, την ημέρα. (various references)

Hebrew 

במשך היום. (various references)

Hungarian

nappal (day, in the daytime). (various references)

Japanese Kanji 

逐日 (day by day, every day, with each passing day), 日増しに (day by day), 日増し (daily, day by day), 日に日に (daily, day by day), 日一日と (day by day), 昼夜を分かたず (by day and night, day and night), 一日増しに (day by day), 一日一日 (day by day, gradually). (various references)

Japanese Katakana 

ひましに (day by day), ひまし (castor bean, daily, day by day), ひにひに (daily, day by day), ひいちにちと (day by day), いちにちましに (day by day), いちにちいちにち (day by day, gradually), ちくじつ (day by day, every day, with each passing day), ちゅうやをわかたず (by day and night, day and night). (various references)

Manx

'sy laa (in the daytime). (various references)

Pig Latin

ybay ayday.(various references)

Portuguese

dia à dia (day by day). (various references)

Romanian

zi de zi (day by day, day in day out), zi şi noapte (by day and by night, day and night). (various references)

Russian 

днем (daytime, in the daytime, in the day-time). (various references)

Serbo-Croatian

danju (day: by day). (various references)

Spanish

de dia (during the day). (various references)

Swedish

på dagen (in the daytime). (various references)

Turkish

gündüzleyin. (various references)

Ukrainian

день у день (day by day). (various references)