In this blog post, let us explore how to work with Date & Time in Rust
Creating DateTime using Standard library and using Chrono crate
It is possible to create DateTime using various approaches. The first thing is by using standard librarie's SystemTime
struct. Create DateTime using SystemTime and then by using chrono
crate's DateTime to format the DateTime value
let curr_time = SystemTime::now();
let dt: DateTime<Utc> = curr_time.clone().into();
println!("Date/Time created using SystemTime: {}", dt.format("%d-%b-%Y %H:%M:%S %P %z"));
The another approach is, by using chrono
crate's Utc
struct
let now = Utc::now();
println!("Date/Time created using UTC: {}", now.format("%d-%b-%Y %H:%M:%S %P %z"));
It is also possible to create DateTime with specific timezone. In this below example, we're creating DateTime with Singapore timezone
let now = Utc::now().with_timezone(&Singapore);
println!("Date/Time with specific timezone created using UTC: {}", now.format("%d-%b-%Y %H:%M:%S %P %z"));
In case if you would like to create DateTime by using custom inputs, we can achieve it by using with_ymd_and_hms
method
let now = Utc.with_ymd_and_hms(2023, 1, 1, 12, 0, 0).unwrap();
println!("Custom Date/Time created using UTC: {}", now.format("%d-%b-%Y %H:%M:%S %P %z"));
Create custom date time, with specific timezone as below
let now = Singapore.with_ymd_and_hms(2023, 1, 1, 12, 0, 0).unwrap();
println!("Custom Date/Time with specific timezone created using UTC: {}", now.format("%d-%b-%Y %H:%M:%S %P %z"));
Create DateTime from String
If you have DateTime value stored in String and you would like to convert it to DateTime type, it can be done using various ways.
Parse a String of format dd-MMM-yyyy HH:mm:ss +tz
to DateTime
let now = DateTime::parse_from_str("01-Jan-2023 12:00:00 pm +0800", "%d-%b-%Y %H:%M:%S %P %z").unwrap();
println!("Parse Date/Time from String: {now:?}");
Parse a String of format yyyy-mm-dd
to Date
let curr_date = NaiveDate::parse_from_str("2023-01-01", "%Y-%m-%d").unwrap();
println!("Parse Date from String: {curr_date:?}");
Parse a String of format dd-mm-yyyy
to Date
let curr_date = NaiveDate::parse_from_str("01-01-2023", "%d-%m-%Y").unwrap();
println!("Parse Date from String: {curr_date:?}");
Parse a String of format MMM-dd-yyyy
to Date
let curr_date = NaiveDate::parse_from_str("Jan-01-2023", "%b-%d-%Y").unwrap();
println!("Parse Date from String: {curr_date:?}");
Parse a String of format HH:mm:ss
to Time
let curr_time= NaiveTime::parse_from_str("12:00:00", "%H:%M:%S").unwrap();
println!("Parse Time from String: {curr_time:?}");
Parse a String of format HH:mm:ss+tz
to Time
let curr_time= NaiveTime::parse_from_str("12:00:00+0800", "%H:%M:%S%z").unwrap();
println!("Parse Time from String: {curr_time:?}");
ParseRFC2822 formatted string to DateTime
let now = DateTime::parse_from_rfc2822("Sun, 1 Jan 2023 12:00:00 +0800").unwrap();
println!("Parse RFC2822 formatted Date/Time from String: {now:?}");
ParseRFC3339 formatted string to DateTime
let now = DateTime::parse_from_rfc3339("2023-01-01T12:00:00+08:00").unwrap();
println!("Parse RFC3339 formatted Date/Time from String: {now:?}");
Create DateTime from Timestamp
In case if you have DateTime in timestamp value, it is possible to create DateTime from it
let now = DateTime::parse_from_str("01-Jan-2023 12:00:00 pm +0800", "%d-%b-%Y %H:%M:%S %P %z").unwrap();
let now_from_timestamp = NaiveDateTime::from_timestamp_millis(now.timestamp_millis());
println!("Create Date/Time from Timestamp: {now_from_timestamp:?}");
DateTime manipulation: Add Day/Month
It is possible to do DateTime manipulation by using Chrono crate
let new_date = now.checked_add_days(Days::new(10)).and_then(|i| i.checked_add_months(Months::new(1)));
println!("Add days and months to a Date/Time: {new_date:?}");
DateTime manipulation: Subtract Day/Month
It is possible to do DateTime manipulation by using Chrono crate
let new_date = now.checked_sub_days(Days::new(10)).and_then(|i| i.checked_sub_months(Months::new(1)));
println!("Subtract days and months from a Date/Time: {new_date:?}");
DateTime comparison
If you would like to compare 2 DateTime values, it can be done by using the comparison operator
let dt1 = Utc.with_ymd_and_hms(2023, 1, 1, 12, 0, 0).unwrap();
let dt2 = Utc.with_ymd_and_hms(2023, 2, 1, 12, 0, 0).unwrap();
if dt1 == dt2 {
println!("{dt1:?} and {dt2:?} are same");
} else {
println!("{dt1:?} and {dt2:?} are NOT same");
}
All the code examples can be found in this link
Please feel free to share your feedback.
Happy reading!!!
Top comments (1)
Thank you for the article.