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March 26, 2018 18:14
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Time ago function in javascript (example: 3 days ago)
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| function console(msg) { | |
| var pre = document.createElement('pre') | |
| pre.innerHTML = msg | |
| document.body.appendChild(pre) | |
| } | |
| function getFeedbackTime(feedbackTimestamp) { | |
| /* | |
| Note: timestamp structure | |
| 2018 - 03 - 26 T 1 4 : 2 7 : 4 8 . 5 0 8 Z | |
| 01234 567 8910 111213 141516 171819 202122 2324 | |
| */ | |
| //compare timestamps only when length equals 24 | |
| if(feedbackTimestamp.length === 24) { | |
| //variables | |
| let currentTimestamp = new Date().toISOString() | |
| const feedback_year = feedbackTimestamp.substring(0,4) | |
| const current_year = currentTimestamp.substring(0,4) | |
| const feedback_month = feedbackTimestamp.substring(5,7) | |
| const current_month = currentTimestamp.substring(5,7) | |
| const feedback_day = feedbackTimestamp.substring(8,10) | |
| const current_day = currentTimestamp.substring(8,10) | |
| const feedback_hour = feedbackTimestamp.substring(11,13) | |
| const current_hour = currentTimestamp.substring(11,13) | |
| const feedback_minute = feedbackTimestamp.substring(14,16) | |
| const current_minute = currentTimestamp.substring(14,16) | |
| const feedback_second = feedbackTimestamp.substring(17,19) | |
| const current_second = currentTimestamp.substring(17,19) | |
| console(currentTimestamp) | |
| console(feedbackTimestamp) | |
| //years | |
| if(current_year !== feedback_year) { | |
| const current_year_number = parseInt(current_year) | |
| const feedback_year_number = parseInt(feedback_year) | |
| const year_diff = current_year_number-feedback_year_number | |
| if(year_diff > 1) { | |
| console(year_diff+' years ago') | |
| } else if(year_diff < 0) { | |
| console(year_diff+' year(s) ahead : invalid scenario') | |
| } else { | |
| console(year_diff+' year ago') | |
| } | |
| } else if(current_month !== feedback_month){ | |
| //months | |
| const current_month_number = parseInt(current_month) | |
| const feedback_month_number = parseInt(feedback_month) | |
| const month_diff = current_month_number - feedback_month_number | |
| if(month_diff > 1) { | |
| console(month_diff+' months ago') | |
| } else if(month_diff < 0) { | |
| console(month_diff+' month(s) ahead : invalid scenario') | |
| } else { | |
| console(month_diff+' month ago') | |
| } | |
| } else if(current_day !== feedback_day) { | |
| //days | |
| const current_day_number = parseInt(current_day) | |
| const feedback_day_number = parseInt(feedback_day) | |
| const day_diff = current_day_number - feedback_day_number | |
| if(day_diff > 1) { | |
| console(day_diff+' days ago') | |
| } else if(day_diff < 0) { | |
| console(day_diff+' day(s) ago : invalid scenario') | |
| } else { | |
| console(day_diff+' day ago') | |
| } | |
| } else if(current_hour !== feedback_hour) { | |
| //hours | |
| const current_hour_number = parseInt(current_hour) | |
| const feedback_hour_number = parseInt(feedback_hour) | |
| const hour_diff = current_hour_number - feedback_hour_number | |
| if(hour_diff > 1) { | |
| console(hour_diff+' hours ago') | |
| } else if(hour_diff < 0) { | |
| console(hour_diff+' hour(s) ahead : invalid scenario') | |
| } else { | |
| console(hour_diff+' hour ago') | |
| } | |
| } else if(current_minute !== feedback_minute) { | |
| //minutes | |
| const current_minute_number = parseInt(current_minute) | |
| const feedback_minute_number = parseInt(feedback_minute) | |
| const minute_diff = current_minute_number - feedback_minute_number | |
| if(minute_diff > 1) { | |
| console(minute_diff+' minutes ago') | |
| } else if(minute_diff < 0) { | |
| console(minute_diff+' minute(s) ahead : invalid scenario') | |
| } else { | |
| console(minute_diff+' minute ago') | |
| } | |
| } else if(current_second !== feedback_second) { | |
| //seconds | |
| const current_second_number = parseInt(current_second) | |
| const feedback_second_number = parseInt(feedback_second) | |
| const second_diff = current_second_number - feedback_second_number | |
| if(second_diff > 1) { | |
| console(second_diff+' seconds ago') | |
| } else if(second_diff < 0) { | |
| console(second_diff+' second(s) ahead : invalid scenario') | |
| } else { | |
| console(second_diff+' second ago') | |
| } | |
| } else if(current_year === feedback_year) { | |
| console('just now') | |
| } | |
| } | |
| else { | |
| console('timestamps can\'t be compared') | |
| } | |
| } | |
| getFeedbackTime('2018-03-26T16:09:45.291Z') |
Output format shall look like
- 2 years ago
- 1 month ago
- 5 days ago
- 3 hours
- 30 minutes ago
- 15 seconds ago
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Add timeAgo.js to an html file (<script src='timeAgo.js'></script>) and watch the output.