How Can I Get Yesterdays Date With DateTime()

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#1

I’d like to get yesterdays date using DateTime, but I’m not sure how, as you cant just subtract second like with os. time.

#2

With DateTime can’t you just subtract 1 day (D or DD) from the D or DD given, or does that cause issues with the month?

#3

I format it as DateTime:FormatUniversalTime(“LL”, en), which prints this: July 25, 2024, but I guess I could reconstruct that with months, days and years?

#4

But then wouldn’t there be an issue with leap years, because even if I change the month back when the day hits zero, I need to know the last day of that month?

#5

I suppose i could store it in a datastore named Yesterday’s date and change it?

#6

Uh, did not check if it works, but it should give you yesterday midnight

local Time = DateTime.now().UnixTimestamp
local Yesterday = os.date("!*t",86400 * math.floor(Time / 86400))
#7

Do you know what format thats in? Such as (Month | Day , year)?

#8

Well, this code printed for me 07/25/24: (Currently its the 7/26/24)

local Time = DateTime.now().UnixTimestamp
local Yesterday = os.date("%x",86400 * math.floor(Time / 86400))
print(Yesterday)
#9

Does it account for months and years aswell, for say Mar 1 - Feb 29th?

#10

What do you mean? it prints the date of yesterday

#11

Do you have a version of this that works with only universal time, as its still the 25th for me

#12

This should work provided UnixTimestamp is not a ReadOnly property:

local yesterdayDateTime = DateTime.now()
yesterdayDateTime.UnixTimestamp -= 86400
#13

Then can I format datetime after ,

yesterdayDatetime:FormatUniversalTime("LL", "en")

And it should turn into the same as yesterday?

#14

Wait, try to run this code, I did not test it but I think it should work?

local Time = DateTime.now().UnixTimestamp
local YesterdayTable = os.date("!*t",86400 * math.floor((Time) / 86400) - 1)
local Yesterday = YesterdayTable["month"].."/"..YesterdayTable["day"].."/"..YesterdayTable["year"]
print(Yesterday)
#15

I’m not sure, and I don’t have access to Roblox Studio currently, so I can’t check.

#16

It prints for me 7/24/24, I think it works as it uses UTC time here.

#17

I believe it is, I get the error UnixTimstamp cannot be assigned to

#18

Here’s an alternative solution:

local now = DateTime.now() 
local yesterday = DateTime.fromUnixTimestamp(now.UnixTimestamp - 86400)
#19 
local currentTime = os.time()
local yesterday = os.date("*t", currentTime - 86400)
local formattedDate = string.format("%04d-%02d-%02d", yesterday.year, yesterday.month, yesterday.day)
print(formattedDate)

-24 hours from the current time …

#20

Try one of this???

DateTime.now().UnixTimestamp - 86400
os.time() - 86400
local Now = os.date("*t") 
local UnixYesterday = os.time{hour = Now.hour, min = Now.min, sec = Now.sec, year = Now.year, month = Now.month, day = Now.day - 1}

Works for me.